diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/adjust-the-hover-state-of-an-anchor-tag.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/adjust-the-hover-state-of-an-anchor-tag.english.md
index d5a4d923ab..80b5d015ff 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/adjust-the-hover-state-of-an-anchor-tag.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/adjust-the-hover-state-of-an-anchor-tag.english.md
@@ -53,7 +53,7 @@ tests:
 
 
 </style>
-<a href="http://freecatphotoapp.com/" target="_blank">CatPhotoApp</a>
+<a href="https://freecatphotoapp.com/" target="_blank">CatPhotoApp</a>
 ```
 
 </div>
@@ -74,7 +74,7 @@ tests:
     color: rgba(0,0,255,1);
   }
 </style>
-<a href="http://freecatphotoapp.com/" target="_blank">CatPhotoApp</a>
+<a href="https://freecatphotoapp.com/" target="_blank">CatPhotoApp</a>
 ```
 
 </section>
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-css/add-borders-around-your-elements.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-css/add-borders-around-your-elements.english.md
index bd70a63918..81ba7daca3 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-css/add-borders-around-your-elements.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-css/add-borders-around-your-elements.english.md
@@ -98,7 +98,7 @@ tests:
     </ol>
   </div>
 
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label><input type="radio" name="indoor-outdoor" checked> Indoor</label>
     <label><input type="radio" name="indoor-outdoor"> Outdoor</label><br>
     <label><input type="checkbox" name="personality" checked> Loving</label>
@@ -165,7 +165,7 @@ tests:
     </ol>
   </div>
 
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label><input type="radio" name="indoor-outdoor" checked> Indoor</label>
     <label><input type="radio" name="indoor-outdoor"> Outdoor</label><br>
     <label><input type="checkbox" name="personality" checked> Loving</label>
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-css/add-rounded-corners-with-border-radius.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-css/add-rounded-corners-with-border-radius.english.md
index bedef218a6..808ff41a26 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-css/add-rounded-corners-with-border-radius.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-css/add-rounded-corners-with-border-radius.english.md
@@ -85,7 +85,7 @@ tests:
     </ol>
   </div>
 
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label><input type="radio" name="indoor-outdoor" checked> Indoor</label>
     <label><input type="radio" name="indoor-outdoor"> Outdoor</label><br>
     <label><input type="checkbox" name="personality" checked> Loving</label>
@@ -155,7 +155,7 @@ tests:
     </ol>
   </div>
 
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label><input type="radio" name="indoor-outdoor" checked> Indoor</label>
     <label><input type="radio" name="indoor-outdoor"> Outdoor</label><br>
     <label><input type="checkbox" name="personality" checked> Loving</label>
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-css/change-the-color-of-text.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-css/change-the-color-of-text.english.md
index 714324e0e1..372cd2f2cb 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-css/change-the-color-of-text.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-css/change-the-color-of-text.english.md
@@ -65,7 +65,7 @@ tests:
     </ol>
   </div>
 
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label><input type="radio" name="indoor-outdoor" checked> Indoor</label>
     <label><input type="radio" name="indoor-outdoor"> Outdoor</label><br>
     <label><input type="checkbox" name="personality" checked> Loving</label>
@@ -108,7 +108,7 @@ tests:
     </ol>
   </div>
 
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label><input type="radio" name="indoor-outdoor" checked> Indoor</label>
     <label><input type="radio" name="indoor-outdoor"> Outdoor</label><br>
     <label><input type="checkbox" name="personality" checked> Loving</label>
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-css/change-the-font-size-of-an-element.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-css/change-the-font-size-of-an-element.english.md
index ddf482e58d..5a3c820a14 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-css/change-the-font-size-of-an-element.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-css/change-the-font-size-of-an-element.english.md
@@ -69,7 +69,7 @@ tests:
     </ol>
   </div>
 
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label><input type="radio" name="indoor-outdoor" checked> Indoor</label>
     <label><input type="radio" name="indoor-outdoor"> Outdoor</label><br>
     <label><input type="checkbox" name="personality" checked> Loving</label>
@@ -121,7 +121,7 @@ tests:
     </ol>
   </div>
 
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label><input type="radio" name="indoor-outdoor" checked> Indoor</label>
     <label><input type="radio" name="indoor-outdoor"> Outdoor</label><br>
     <label><input type="checkbox" name="personality" checked> Loving</label>
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-css/give-a-background-color-to-a-div-element.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-css/give-a-background-color-to-a-div-element.english.md
index 5d19482984..8234e42b96 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-css/give-a-background-color-to-a-div-element.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-css/give-a-background-color-to-a-div-element.english.md
@@ -95,7 +95,7 @@ tests:
     </ol>
   </div>
 
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label><input type="radio" name="indoor-outdoor" checked> Indoor</label>
     <label><input type="radio" name="indoor-outdoor"> Outdoor</label><br>
     <label><input type="checkbox" name="personality" checked> Loving</label>
@@ -169,7 +169,7 @@ tests:
     </ol>
   </div>
 
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label><input type="radio" name="indoor-outdoor" checked> Indoor</label>
     <label><input type="radio" name="indoor-outdoor"> Outdoor</label><br>
     <label><input type="checkbox" name="personality" checked> Loving</label>
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-css/import-a-google-font.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-css/import-a-google-font.english.md
index cb0ab35e87..a21baec0ac 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-css/import-a-google-font.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-css/import-a-google-font.english.md
@@ -80,7 +80,7 @@ tests:
     </ol>
   </div>
 
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label><input type="radio" name="indoor-outdoor" checked> Indoor</label>
     <label><input type="radio" name="indoor-outdoor"> Outdoor</label><br>
     <label><input type="checkbox" name="personality" checked> Loving</label>
@@ -139,7 +139,7 @@ tests:
     </ol>
   </div>
 
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label><input type="radio" name="indoor-outdoor" checked> Indoor</label>
     <label><input type="radio" name="indoor-outdoor"> Outdoor</label><br>
     <label><input type="checkbox" name="personality" checked> Loving</label>
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-css/make-circular-images-with-a-border-radius.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-css/make-circular-images-with-a-border-radius.english.md
index b9fa766366..8c5abf2ede 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-css/make-circular-images-with-a-border-radius.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-css/make-circular-images-with-a-border-radius.english.md
@@ -85,7 +85,7 @@ tests:
     </ol>
   </div>
 
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label><input type="radio" name="indoor-outdoor" checked> Indoor</label>
     <label><input type="radio" name="indoor-outdoor"> Outdoor</label><br>
     <label><input type="checkbox" name="personality" checked> Loving</label>
@@ -156,7 +156,7 @@ tests:
     </ol>
   </div>
 
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label><input type="radio" name="indoor-outdoor" checked> Indoor</label>
     <label><input type="radio" name="indoor-outdoor"> Outdoor</label><br>
     <label><input type="checkbox" name="personality" checked> Loving</label>
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-css/set-the-font-family-of-an-element.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-css/set-the-font-family-of-an-element.english.md
index 7c84ec9733..dfe1811c2c 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-css/set-the-font-family-of-an-element.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-css/set-the-font-family-of-an-element.english.md
@@ -74,7 +74,7 @@ tests:
     </ol>
   </div>
 
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label><input type="radio" name="indoor-outdoor" checked> Indoor</label>
     <label><input type="radio" name="indoor-outdoor"> Outdoor</label><br>
     <label><input type="checkbox" name="personality" checked> Loving</label>
@@ -128,7 +128,7 @@ tests:
     </ol>
   </div>
   
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label><input type="radio" name="indoor-outdoor" checked> Indoor</label>
     <label><input type="radio" name="indoor-outdoor"> Outdoor</label><br>
     <label><input type="checkbox" name="personality" checked> Loving</label>
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-css/set-the-id-of-an-element.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-css/set-the-id-of-an-element.english.md
index 040fd8b0e8..9c5ef79d69 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-css/set-the-id-of-an-element.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-css/set-the-id-of-an-element.english.md
@@ -91,7 +91,7 @@ tests:
     </ol>
   </div>
 
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label><input type="radio" name="indoor-outdoor" checked> Indoor</label>
     <label><input type="radio" name="indoor-outdoor"> Outdoor</label><br>
     <label><input type="checkbox" name="personality" checked> Loving</label>
@@ -165,7 +165,7 @@ tests:
     </ol>
   </div>
   
-  <form action="/submit-cat-photo" id="cat-photo-form">
+  <form action="https://freecatphotoapp.com/submit-cat-photo" id="cat-photo-form">
     <label><input type="radio" name="indoor-outdoor" checked> Indoor</label>
     <label><input type="radio" name="indoor-outdoor"> Outdoor</label><br>
     <label><input type="checkbox" name="personality" checked> Loving</label>
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-css/size-your-images.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-css/size-your-images.english.md
index b13ccedccd..f8c9ca356a 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-css/size-your-images.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-css/size-your-images.english.md
@@ -85,7 +85,7 @@ tests:
     </ol>
   </div>
 
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label><input type="radio" name="indoor-outdoor" checked> Indoor</label>
     <label><input type="radio" name="indoor-outdoor"> Outdoor</label><br>
     <label><input type="checkbox" name="personality" checked> Loving</label>
@@ -148,7 +148,7 @@ tests:
     </ol>
   </div>
   
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label><input type="radio" name="indoor-outdoor" checked> Indoor</label>
     <label><input type="radio" name="indoor-outdoor"> Outdoor</label><br>
     <label><input type="checkbox" name="personality" checked> Loving</label>
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-css/specify-how-fonts-should-degrade.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-css/specify-how-fonts-should-degrade.english.md
index 1c18130468..a8bba897ce 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-css/specify-how-fonts-should-degrade.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-css/specify-how-fonts-should-degrade.english.md
@@ -90,7 +90,7 @@ tests:
     </ol>
   </div>
 
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label><input type="radio" name="indoor-outdoor" checked> Indoor</label>
     <label><input type="radio" name="indoor-outdoor"> Outdoor</label><br>
     <label><input type="checkbox" name="personality" checked> Loving</label>
@@ -149,7 +149,7 @@ tests:
     </ol>
   </div>
   
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label><input type="radio" name="indoor-outdoor" checked> Indoor</label>
     <label><input type="radio" name="indoor-outdoor"> Outdoor</label><br>
     <label><input type="checkbox" name="personality" checked> Loving</label>
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-css/style-multiple-elements-with-a-css-class.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-css/style-multiple-elements-with-a-css-class.english.md
index 24e39e44c6..3a8a1ddf46 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-css/style-multiple-elements-with-a-css-class.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-css/style-multiple-elements-with-a-css-class.english.md
@@ -70,7 +70,7 @@ tests:
     </ol>
   </div>
 
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label><input type="radio" name="indoor-outdoor" checked> Indoor</label>
     <label><input type="radio" name="indoor-outdoor"> Outdoor</label><br>
     <label><input type="checkbox" name="personality" checked> Loving</label>
@@ -119,7 +119,7 @@ tests:
     </ol>
   </div>
   
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label><input type="radio" name="indoor-outdoor" checked> Indoor</label>
     <label><input type="radio" name="indoor-outdoor"> Outdoor</label><br>
     <label><input type="checkbox" name="personality" checked> Loving</label>
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-css/use-a-css-class-to-style-an-element.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-css/use-a-css-class-to-style-an-element.english.md
index bde2967d4a..d0bdc1e4a7 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-css/use-a-css-class-to-style-an-element.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-css/use-a-css-class-to-style-an-element.english.md
@@ -83,7 +83,7 @@ tests:
     </ol>
   </div>
 
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label><input type="radio" name="indoor-outdoor" checked> Indoor</label>
     <label><input type="radio" name="indoor-outdoor"> Outdoor</label><br>
     <label><input type="checkbox" name="personality" checked> Loving</label>
@@ -132,7 +132,7 @@ tests:
     </ol>
   </div>
   
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label><input type="radio" name="indoor-outdoor" checked> Indoor</label>
     <label><input type="radio" name="indoor-outdoor"> Outdoor</label><br>
     <label><input type="checkbox" name="personality" checked> Loving</label>
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-css/use-an-id-attribute-to-style-an-element.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-css/use-an-id-attribute-to-style-an-element.english.md
index 1d20555297..da20eee00e 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-css/use-an-id-attribute-to-style-an-element.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-css/use-an-id-attribute-to-style-an-element.english.md
@@ -103,7 +103,7 @@ tests:
     </ol>
   </div>
 
-  <form action="/submit-cat-photo" id="cat-photo-form">
+  <form action="https://freecatphotoapp.com/submit-cat-photo" id="cat-photo-form">
     <label><input type="radio" name="indoor-outdoor" checked> Indoor</label>
     <label><input type="radio" name="indoor-outdoor"> Outdoor</label><br>
     <label><input type="checkbox" name="personality" checked> Loving</label>
@@ -181,7 +181,7 @@ tests:
     </ol>
   </div>
   
-  <form action="/submit-cat-photo" id="cat-photo-form">
+  <form action="https://freecatphotoapp.com/submit-cat-photo" id="cat-photo-form">
     <label><input type="radio" name="indoor-outdoor" checked> Indoor</label>
     <label><input type="radio" name="indoor-outdoor"> Outdoor</label><br>
     <label><input type="checkbox" name="personality" checked> Loving</label>
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-css/use-attribute-selectors-to-style-elements.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-css/use-attribute-selectors-to-style-elements.english.md
index eef812983c..84d20d99f5 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-css/use-attribute-selectors-to-style-elements.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-css/use-attribute-selectors-to-style-elements.english.md
@@ -100,7 +100,7 @@ tests:
     </ol>
   </div>
 
-  <form action="/submit-cat-photo" id="cat-photo-form">
+  <form action="https://freecatphotoapp.com/submit-cat-photo" id="cat-photo-form">
     <label><input type="radio" name="indoor-outdoor" checked> Indoor</label>
     <label><input type="radio" name="indoor-outdoor"> Outdoor</label><br>
     <label><input type="checkbox" name="personality" checked> Loving</label>
@@ -178,7 +178,7 @@ tests:
     </ol>
   </div>
   
-  <form action="/submit-cat-photo" id="cat-photo-form">
+  <form action="https://freecatphotoapp.com/submit-cat-photo" id="cat-photo-form">
     <label><input type="radio" name="indoor-outdoor" checked> Indoor</label>
     <label><input type="radio" name="indoor-outdoor"> Outdoor</label><br>
     <label><input type="checkbox" name="personality" checked> Loving</label>
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-css/use-css-selectors-to-style-elements.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-css/use-css-selectors-to-style-elements.english.md
index 2ed3f37db2..1e61e15a6e 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-css/use-css-selectors-to-style-elements.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-css/use-css-selectors-to-style-elements.english.md
@@ -84,7 +84,7 @@ tests:
     </ol>
   </div>
 
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label><input type="radio" name="indoor-outdoor" checked> Indoor</label>
     <label><input type="radio" name="indoor-outdoor"> Outdoor</label><br>
     <label><input type="checkbox" name="personality" checked> Loving</label>
@@ -132,7 +132,7 @@ tests:
     </ol>
   </div>
 
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label><input type="radio" name="indoor-outdoor" checked> Indoor</label>
     <label><input type="radio" name="indoor-outdoor"> Outdoor</label><br>
     <label><input type="checkbox" name="personality" checked> Loving</label>
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/add-a-submit-button-to-a-form.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/add-a-submit-button-to-a-form.english.md
index fe14364105..1f0ec03571 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/add-a-submit-button-to-a-form.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/add-a-submit-button-to-a-form.english.md
@@ -61,7 +61,7 @@ tests:
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <input type="text" placeholder="cat photo URL">
   </form>
 </main>
@@ -92,7 +92,7 @@ tests:
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <input type="text" placeholder="cat photo URL">
     <button type="submit">Submit</button>
   </form>
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/check-radio-buttons-and-checkboxes-by-default.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/check-radio-buttons-and-checkboxes-by-default.english.md
index 37facc2217..3656e699b9 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/check-radio-buttons-and-checkboxes-by-default.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/check-radio-buttons-and-checkboxes-by-default.english.md
@@ -57,7 +57,7 @@ tests:
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label for="indoor"><input id="indoor" type="radio" name="indoor-outdoor" value="indoor"> Indoor</label>
     <label for="outdoor"><input id="outdoor" type="radio" name="indoor-outdoor" value="outdoor"> Outdoor</label><br>
     <label for="loving"><input id="loving" type="checkbox" name="personality" value="loving"> Loving</label>
@@ -97,7 +97,7 @@ tests:
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label for="indoor"><input id="indoor" type="radio" name="indoor-outdoor" value="indoor" checked> Indoor</label>
     <label for="outdoor"><input id="outdoor" type="radio" name="indoor-outdoor" value="outdoor"> Outdoor</label><br>
     <label for="loving"><input id="loving" type="checkbox" name="personality" value="loving" checked> Loving</label>
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/create-a-form-element.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/create-a-form-element.english.md
index 19c973c4a1..7489b58e71 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/create-a-form-element.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/create-a-form-element.english.md
@@ -16,7 +16,7 @@ For example:
 
 ## Instructions
 <section id='instructions'>
-Nest your text field inside a <code>form</code> element, and add the <code>action="/submit-cat-photo"</code> attribute to the form element.
+Nest your text field inside a <code>form</code> element, and add the <code>action="https://freecatphotoapp.com/submit-cat-photo"</code> attribute to the form element.
 </section>
 
 ## Tests
@@ -26,8 +26,8 @@ Nest your text field inside a <code>form</code> element, and add the <code>actio
 tests:
   - text: Your text input element should be nested within a <code>form</code> element.
     testString: assert($("form") && $("form").children("input") && $("form").children("input").length > 0);
-  - text: Your <code>form</code> should have an <code>action</code> attribute which is set to <code>/submit-cat-photo</code>
-    testString: assert($("form").attr("action") === "/submit-cat-photo");
+  - text: Your <code>form</code> should have an <code>action</code> attribute which is set to <code>https://freecatphotoapp.com/submit-cat-photo</code>
+    testString: assert($("form").attr("action") === "https://freecatphotoapp.com/submit-cat-photo");
   - text: Your <code>form</code> element should have well-formed open and close tags.
     testString: assert(code.match(/<\/form>/g) && code.match(/<form [^<]*>/g) && code.match(/<\/form>/g).length === code.match(/<form [^<]*>/g).length);
 
@@ -91,7 +91,7 @@ tests:
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <input type="text" placeholder="cat photo URL">
   </form>
 </main>
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/create-a-set-of-checkboxes.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/create-a-set-of-checkboxes.english.md
index 384a0d653d..9e09a76b0f 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/create-a-set-of-checkboxes.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/create-a-set-of-checkboxes.english.md
@@ -67,7 +67,7 @@ tests:
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label for="indoor"><input id="indoor" type="radio" name="indoor-outdoor"> Indoor</label>
     <label for="outdoor"><input id="outdoor" type="radio" name="indoor-outdoor"> Outdoor</label><br>
     <input type="text" placeholder="cat photo URL" required>
@@ -104,7 +104,7 @@ tests:
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label for="indoor"><input id="indoor" type="radio" name="indoor-outdoor"> Indoor</label>
     <label for="outdoor"><input id="outdoor" type="radio" name="indoor-outdoor"> Outdoor</label><br>
     <label for="playful"><input id="playful" type="checkbox" name="personality">Playful</label>
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/create-a-set-of-radio-buttons.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/create-a-set-of-radio-buttons.english.md
index a30869f240..d84a1322f3 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/create-a-set-of-radio-buttons.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/create-a-set-of-radio-buttons.english.md
@@ -84,7 +84,7 @@ tests:
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <input type="text" placeholder="cat photo URL" required>
     <button type="submit">Submit</button>
   </form>
@@ -119,7 +119,7 @@ tests:
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
    <label for="indoor"><input id="indoor" type="radio" name="indoor-outdoor"> Indoor</label>
     <label for="outdoor"><input id="outdoor" type="radio" name="indoor-outdoor"> Outdoor</label><br>
     <input type="text" placeholder="cat photo URL" required>
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/link-to-external-pages-with-anchor-elements.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/link-to-external-pages-with-anchor-elements.english.md
index 5508855467..997c1f1dc1 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/link-to-external-pages-with-anchor-elements.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/link-to-external-pages-with-anchor-elements.english.md
@@ -17,7 +17,7 @@ Then your browser will display the text <strong>"this links to freecodecamp.org"
 
 ## Instructions
 <section id='instructions'>
-Create an <code>a</code> element that links to <code>http://freecatphotoapp.com</code> and has "cat photos" as its anchor text.
+Create an <code>a</code> element that links to <code>https://freecatphotoapp.com</code> and has "cat photos" as its anchor text.
 </section>
 
 ## Tests
@@ -27,8 +27,8 @@ Create an <code>a</code> element that links to <code>http://freecatphotoapp.com<
 tests:
   - text: Your <code>a</code> element should have the anchor text of "cat photos".
     testString: assert((/cat photos/gi).test($("a").text()));
-  - text: You need an <code>a</code> element that links to <code>http&#58;//freecatphotoapp<wbr>.com</code>
-    testString: assert(/http:\/\/(www\.)?freecatphotoapp\.com/gi.test($("a").attr("href")));
+  - text: You need an <code>a</code> element that links to <code>https://freecatphotoapp.com</code>
+    testString: assert(/https:\/\/(www\.)?freecatphotoapp\.com/gi.test($("a").attr("href")));
   - text: Your <code>a</code> element should have a closing tag.
     testString: assert(code.match(/<\/a>/g) && code.match(/<\/a>/g).length === code.match(/<a/g).length);
 
@@ -69,7 +69,7 @@ tests:
   
   <img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back.">
   
-  <a href="http://freecatphotoapp.com">cat photos</a>
+  <a href="https://freecatphotoapp.com">cat photos</a>
   <p>Kitty ipsum dolor sit amet, shed everywhere shed everywhere stretching attack your ankles chase the red dot, hairball run catnip eat the grass sniff.</p>
   <p>Purr jump eat the grass rip the couch scratched sunbathe, shed everywhere rip the couch sleep in the sink fluffy fur catnip scratched.</p>
 </main>
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/link-to-internal-sections-of-a-page-with-anchor-elements.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/link-to-internal-sections-of-a-page-with-anchor-elements.english.md
index 969857cb74..e77314ae11 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/link-to-internal-sections-of-a-page-with-anchor-elements.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/link-to-internal-sections-of-a-page-with-anchor-elements.english.md
@@ -60,7 +60,7 @@ tests:
 <h2>CatPhotoApp</h2>
 <main>
 
-  <a href="http://freecatphotoapp.com" target="_blank">cat photos</a>
+  <a href="https://freecatphotoapp.com" target="_blank">cat photos</a>
 
   <img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back.">
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/make-dead-links-using-the-hash-symbol.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/make-dead-links-using-the-hash-symbol.english.md
index 9e2923ee3a..f68006a436 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/make-dead-links-using-the-hash-symbol.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/make-dead-links-using-the-hash-symbol.english.md
@@ -15,7 +15,7 @@ This is also handy when you're changing the behavior of a link using <code>JavaS
 
 ## Instructions
 <section id='instructions'>
-The current value of the <code>href</code> attribute is a link that points to "http://freecatphotoapp.com". Replace the <code>href</code> attribute value with a <code>#</code>, also known as a hash symbol, to create a dead link.
+The current value of the <code>href</code> attribute is a link that points to "https://freecatphotoapp.com". Replace the <code>href</code> attribute value with a <code>#</code>, also known as a hash symbol, to create a dead link.
 For example: <code>href="#"</code>
 </section>
 
@@ -39,7 +39,7 @@ tests:
 ```html
 <h2>CatPhotoApp</h2>
 <main>
-  <p>Click here to view more <a href="http://freecatphotoapp.com" target="_blank">cat photos</a>.</p>
+  <p>Click here to view more <a href="https://freecatphotoapp.com" target="_blank">cat photos</a>.</p>
 
   <img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back.">
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/nest-an-anchor-element-within-a-paragraph.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/nest-an-anchor-element-within-a-paragraph.english.md
index fee2c7fa43..bf68ab227f 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/nest-an-anchor-element-within-a-paragraph.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/nest-an-anchor-element-within-a-paragraph.english.md
@@ -38,16 +38,16 @@ Now nest the existing <code>a</code> element within a new <code>p</code> element
 
 ```yml
 tests:
-  - text: You should have an <code>a</code> element that links to "http://freecatphotoapp.com".
-    testString: assert(($("a[href=\"http://freecatphotoapp.com\"]").length > 0 || $("a[href=\"http://www.freecatphotoapp.com\"]").length > 0));
+  - text: You should have an <code>a</code> element that links to "https://freecatphotoapp.com".
+    testString: assert(($("a[href=\"https://freecatphotoapp.com\"]").length > 0 || $("a[href=\"http://www.freecatphotoapp.com\"]").length > 0));
   - text: Your <code>a</code> element should have the anchor text of "cat photos"
     testString: assert($("a").text().match(/cat\sphotos/gi));
   - text: You should create a new <code>p</code> element around your <code>a</code> element. There should be at least 3 total <code>p</code> tags in your HTML code.
     testString: assert($("p") && $("p").length > 2);
   - text: Your <code>a</code> element should be nested within your new <code>p</code> element.
-    testString: assert(($("a[href=\"http://freecatphotoapp.com\"]").parent().is("p") || $("a[href=\"http://www.freecatphotoapp.com\"]").parent().is("p")));
+    testString: assert(($("a[href=\"https://freecatphotoapp.com\"]").parent().is("p") || $("a[href=\"http://www.freecatphotoapp.com\"]").parent().is("p")));
   - text: Your <code>p</code> element should have the text "View more " (with a space after it).
-    testString: assert(($("a[href=\"http://freecatphotoapp.com\"]").parent().text().match(/View\smore\s/gi) || $("a[href=\"http://www.freecatphotoapp.com\"]").parent().text().match(/View\smore\s/gi)));
+    testString: assert(($("a[href=\"https://freecatphotoapp.com\"]").parent().text().match(/View\smore\s/gi) || $("a[href=\"http://www.freecatphotoapp.com\"]").parent().text().match(/View\smore\s/gi)));
   - text: Your <code>a</code> element should <em>not</em> have the text "View more".
     testString: assert(!$("a").text().match(/View\smore/gi));
   - text: Each of your <code>p</code> elements should have a closing tag.
@@ -68,7 +68,7 @@ tests:
 <h2>CatPhotoApp</h2>
 <main>
 
-  <a href="http://freecatphotoapp.com" target="_blank">cat photos</a>
+  <a href="https://freecatphotoapp.com" target="_blank">cat photos</a>
 
   <img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back.">
 
@@ -89,7 +89,7 @@ tests:
 ```html
 <h2>CatPhotoApp</h2>
 <main>
-  <p>View more <a target="_blank" href="http://freecatphotoapp.com">cat photos</a></p>
+  <p>View more <a target="_blank" href="https://freecatphotoapp.com">cat photos</a></p>
 
   <img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back.">
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/nest-many-elements-within-a-single-div-element.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/nest-many-elements-within-a-single-div-element.english.md
index fca3e54e3a..83f44c50ff 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/nest-many-elements-within-a-single-div-element.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/nest-many-elements-within-a-single-div-element.english.md
@@ -63,7 +63,7 @@ tests:
     <li>other cats</li>
   </ol>
 
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label for="indoor"><input id="indoor" type="radio" name="indoor-outdoor" value="indoor" checked> Indoor</label>
     <label for="outdoor"><input id="outdoor" type="radio" name="indoor-outdoor" value="outdoor"> Outdoor</label><br>
     <label for="loving"><input id="loving" type="checkbox" name="personality" value="loving" checked> Loving</label>
@@ -104,7 +104,7 @@ tests:
       <li>other cats</li>
     </ol>
   </div>
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label for="indoor"><input id="indoor" type="radio" name="indoor-outdoor" value="indoor" checked> Indoor</label>
     <label for="outdoor"><input id="outdoor" type="radio" name="indoor-outdoor" value="outdoor"> Outdoor</label><br>
     <label for="loving"><input id="loving" type="checkbox" name="personality" value="loving" checked> Loving</label>
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/use-html5-to-require-a-field.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/use-html5-to-require-a-field.english.md
index 0b285f1026..b8a21c0ec7 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/use-html5-to-require-a-field.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/use-html5-to-require-a-field.english.md
@@ -55,7 +55,7 @@ tests:
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <input type="text" placeholder="cat photo URL">
     <button type="submit">Submit</button>
   </form>
@@ -90,7 +90,7 @@ tests:
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <input type="text" required placeholder="cat photo URL">
     <button type="submit">Submit</button>
   </form>
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/use-the-value-attribute-with-radio-buttons-and-checkboxes.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/use-the-value-attribute-with-radio-buttons-and-checkboxes.english.md
index ba90fb02cd..37b7c52f71 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/use-the-value-attribute-with-radio-buttons-and-checkboxes.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/use-the-value-attribute-with-radio-buttons-and-checkboxes.english.md
@@ -75,7 +75,7 @@ tests:
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label><input type="radio" name="indoor-outdoor"> Indoor</label>
     <label><input type="radio" name="indoor-outdoor"> Outdoor</label><br>
     <label><input type="checkbox" name="personality"> Loving</label>
@@ -115,7 +115,7 @@ tests:
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label><input type="radio" name="indoor-outdoor" value="indoor"> Indoor</label>
     <label><input type="radio" name="indoor-outdoor" value="outdoor"> Outdoor</label><br>
     <label><input type="checkbox" name="personality" value="loving"> Loving</label>
diff --git a/curriculum/challenges/english/03-front-end-libraries/bootstrap/add-font-awesome-icons-to-all-of-our-buttons.english.md b/curriculum/challenges/english/03-front-end-libraries/bootstrap/add-font-awesome-icons-to-all-of-our-buttons.english.md
index f8aeb78a85..7e09c78e93 100644
--- a/curriculum/challenges/english/03-front-end-libraries/bootstrap/add-font-awesome-icons-to-all-of-our-buttons.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/bootstrap/add-font-awesome-icons-to-all-of-our-buttons.english.md
@@ -90,7 +90,7 @@ tests:
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label><input type="radio" name="indoor-outdoor"> Indoor</label>
     <label><input type="radio" name="indoor-outdoor"> Outdoor</label>
     <label><input type="checkbox" name="personality"> Loving</label>
@@ -159,7 +159,7 @@ tests:
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label><input type="radio" name="indoor-outdoor"> Indoor</label>
     <label><input type="radio" name="indoor-outdoor"> Outdoor</label>
     <label><input type="checkbox" name="personality"> Loving</label>
diff --git a/curriculum/challenges/english/03-front-end-libraries/bootstrap/add-font-awesome-icons-to-our-buttons.english.md b/curriculum/challenges/english/03-front-end-libraries/bootstrap/add-font-awesome-icons-to-our-buttons.english.md
index 4f0dd0be73..36173c9318 100644
--- a/curriculum/challenges/english/03-front-end-libraries/bootstrap/add-font-awesome-icons-to-our-buttons.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/bootstrap/add-font-awesome-icons-to-our-buttons.english.md
@@ -95,7 +95,7 @@ tests:
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label><input type="radio" name="indoor-outdoor"> Indoor</label>
     <label><input type="radio" name="indoor-outdoor"> Outdoor</label>
     <label><input type="checkbox" name="personality"> Loving</label>
@@ -164,7 +164,7 @@ tests:
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label><input type="radio" name="indoor-outdoor"> Indoor</label>
     <label><input type="radio" name="indoor-outdoor"> Outdoor</label>
     <label><input type="checkbox" name="personality"> Loving</label>
diff --git a/curriculum/challenges/english/03-front-end-libraries/bootstrap/call-out-optional-actions-with-btn-info.english.md b/curriculum/challenges/english/03-front-end-libraries/bootstrap/call-out-optional-actions-with-btn-info.english.md
index 1b122ed810..5b163a1c2c 100644
--- a/curriculum/challenges/english/03-front-end-libraries/bootstrap/call-out-optional-actions-with-btn-info.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/bootstrap/call-out-optional-actions-with-btn-info.english.md
@@ -90,7 +90,7 @@ tests:
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label><input type="radio" name="indoor-outdoor"> Indoor</label>
     <label><input type="radio" name="indoor-outdoor"> Outdoor</label>
     <label><input type="checkbox" name="personality"> Loving</label>
@@ -162,7 +162,7 @@ tests:
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label><input type="radio" name="indoor-outdoor"> Indoor</label>
     <label><input type="radio" name="indoor-outdoor"> Outdoor</label>
     <label><input type="checkbox" name="personality"> Loving</label>
diff --git a/curriculum/challenges/english/03-front-end-libraries/bootstrap/center-text-with-bootstrap.english.md b/curriculum/challenges/english/03-front-end-libraries/bootstrap/center-text-with-bootstrap.english.md
index 7e00543b2b..57b215ae0a 100644
--- a/curriculum/challenges/english/03-front-end-libraries/bootstrap/center-text-with-bootstrap.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/bootstrap/center-text-with-bootstrap.english.md
@@ -85,7 +85,7 @@ tests:
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label><input type="radio" name="indoor-outdoor"> Indoor</label>
     <label><input type="radio" name="indoor-outdoor"> Outdoor</label>
     <label><input type="checkbox" name="personality"> Loving</label>
@@ -154,7 +154,7 @@ tests:
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label><input type="radio" name="indoor-outdoor"> Indoor</label>
     <label><input type="radio" name="indoor-outdoor"> Outdoor</label>
     <label><input type="checkbox" name="personality"> Loving</label>
diff --git a/curriculum/challenges/english/03-front-end-libraries/bootstrap/create-a-block-element-bootstrap-button.english.md b/curriculum/challenges/english/03-front-end-libraries/bootstrap/create-a-block-element-bootstrap-button.english.md
index f43b8ea662..7e7e63573a 100644
--- a/curriculum/challenges/english/03-front-end-libraries/bootstrap/create-a-block-element-bootstrap-button.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/bootstrap/create-a-block-element-bootstrap-button.english.md
@@ -95,7 +95,7 @@ tests:
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label><input type="radio" name="indoor-outdoor"> Indoor</label>
     <label><input type="radio" name="indoor-outdoor"> Outdoor</label>
     <label><input type="checkbox" name="personality"> Loving</label>
@@ -165,7 +165,7 @@ tests:
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label><input type="radio" name="indoor-outdoor"> Indoor</label>
     <label><input type="radio" name="indoor-outdoor"> Outdoor</label>
     <label><input type="checkbox" name="personality"> Loving</label>
diff --git a/curriculum/challenges/english/03-front-end-libraries/bootstrap/create-a-bootstrap-button.english.md b/curriculum/challenges/english/03-front-end-libraries/bootstrap/create-a-bootstrap-button.english.md
index 6728c60c1e..41bb3bae9b 100644
--- a/curriculum/challenges/english/03-front-end-libraries/bootstrap/create-a-bootstrap-button.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/bootstrap/create-a-bootstrap-button.english.md
@@ -87,7 +87,7 @@ tests:
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label><input type="radio" name="indoor-outdoor"> Indoor</label>
     <label><input type="radio" name="indoor-outdoor"> Outdoor</label>
     <label><input type="checkbox" name="personality"> Loving</label>
@@ -164,7 +164,7 @@ tests:
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label><input type="radio" name="indoor-outdoor"> Indoor</label>
     <label><input type="radio" name="indoor-outdoor"> Outdoor</label>
     <label><input type="checkbox" name="personality"> Loving</label>
diff --git a/curriculum/challenges/english/03-front-end-libraries/bootstrap/create-a-custom-heading.english.md b/curriculum/challenges/english/03-front-end-libraries/bootstrap/create-a-custom-heading.english.md
index 041cc2be3a..7315942e8b 100644
--- a/curriculum/challenges/english/03-front-end-libraries/bootstrap/create-a-custom-heading.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/bootstrap/create-a-custom-heading.english.md
@@ -87,7 +87,7 @@ tests:
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label><input type="radio" name="indoor-outdoor"> Indoor</label>
     <label><input type="radio" name="indoor-outdoor"> Outdoor</label>
     <label><input type="checkbox" name="personality"> Loving</label>
@@ -157,7 +157,7 @@ tests:
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label><input type="radio" name="indoor-outdoor"> Indoor</label>
     <label><input type="radio" name="indoor-outdoor"> Outdoor</label>
     <label><input type="checkbox" name="personality"> Loving</label>
diff --git a/curriculum/challenges/english/03-front-end-libraries/bootstrap/ditch-custom-css-for-bootstrap.english.md b/curriculum/challenges/english/03-front-end-libraries/bootstrap/ditch-custom-css-for-bootstrap.english.md
index 794c0e60ed..549fb7996a 100644
--- a/curriculum/challenges/english/03-front-end-libraries/bootstrap/ditch-custom-css-for-bootstrap.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/bootstrap/ditch-custom-css-for-bootstrap.english.md
@@ -104,7 +104,7 @@ tests:
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label><input type="radio" name="indoor-outdoor"> Indoor</label>
     <label><input type="radio" name="indoor-outdoor"> Outdoor</label>
     <label><input type="checkbox" name="personality"> Loving</label>
@@ -169,7 +169,7 @@ tests:
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label><input type="radio" name="indoor-outdoor"> Indoor</label>
     <label><input type="radio" name="indoor-outdoor"> Outdoor</label>
     <label><input type="checkbox" name="personality"> Loving</label>
diff --git a/curriculum/challenges/english/03-front-end-libraries/bootstrap/line-up-form-elements-responsively-with-bootstrap.english.md b/curriculum/challenges/english/03-front-end-libraries/bootstrap/line-up-form-elements-responsively-with-bootstrap.english.md
index 05642ad822..d8e45c0756 100644
--- a/curriculum/challenges/english/03-front-end-libraries/bootstrap/line-up-form-elements-responsively-with-bootstrap.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/bootstrap/line-up-form-elements-responsively-with-bootstrap.english.md
@@ -93,7 +93,7 @@ tests:
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <div class="row">
       <div class="col-xs-6">
         <label><input type="radio" name="indoor-outdoor"> Indoor</label>
@@ -177,7 +177,7 @@ tests:
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <div class="row">
       <div class="col-xs-6">
         <label><input type="radio" name="indoor-outdoor"> Indoor</label>
diff --git a/curriculum/challenges/english/03-front-end-libraries/bootstrap/make-images-mobile-responsive.english.md b/curriculum/challenges/english/03-front-end-libraries/bootstrap/make-images-mobile-responsive.english.md
index c550dc9771..db5015ac60 100644
--- a/curriculum/challenges/english/03-front-end-libraries/bootstrap/make-images-mobile-responsive.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/bootstrap/make-images-mobile-responsive.english.md
@@ -90,7 +90,7 @@ tests:
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label><input type="radio" name="indoor-outdoor"> Indoor</label>
     <label><input type="radio" name="indoor-outdoor"> Outdoor</label>
     <label><input type="checkbox" name="personality"> Loving</label>
@@ -159,7 +159,7 @@ tests:
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label><input type="radio" name="indoor-outdoor"> Indoor</label>
     <label><input type="radio" name="indoor-outdoor"> Outdoor</label>
     <label><input type="checkbox" name="personality"> Loving</label>
diff --git a/curriculum/challenges/english/03-front-end-libraries/bootstrap/responsively-style-checkboxes.english.md b/curriculum/challenges/english/03-front-end-libraries/bootstrap/responsively-style-checkboxes.english.md
index c7e0a6a67d..d2f2bf320e 100644
--- a/curriculum/challenges/english/03-front-end-libraries/bootstrap/responsively-style-checkboxes.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/bootstrap/responsively-style-checkboxes.english.md
@@ -89,7 +89,7 @@ tests:
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <div class="row">
       <div class="col-xs-6">
         <label><input type="radio" name="indoor-outdoor"> Indoor</label>
@@ -165,7 +165,7 @@ tests:
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <div class="row">
       <div class="col-xs-6">
         <label><input type="radio" name="indoor-outdoor"> Indoor</label>
diff --git a/curriculum/challenges/english/03-front-end-libraries/bootstrap/responsively-style-radio-buttons.english.md b/curriculum/challenges/english/03-front-end-libraries/bootstrap/responsively-style-radio-buttons.english.md
index f4c18ba0fb..38e6d45f3f 100644
--- a/curriculum/challenges/english/03-front-end-libraries/bootstrap/responsively-style-radio-buttons.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/bootstrap/responsively-style-radio-buttons.english.md
@@ -90,7 +90,7 @@ tests:
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label><input type="radio" name="indoor-outdoor"> Indoor</label>
     <label><input type="radio" name="indoor-outdoor"> Outdoor</label>
     <label><input type="checkbox" name="personality"> Loving</label>
@@ -159,7 +159,7 @@ tests:
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
   <div class="row">
       <div class="col-xs-6">
         <label><input type="radio" name="indoor-outdoor"> Indoor</label>
diff --git a/curriculum/challenges/english/03-front-end-libraries/bootstrap/style-text-inputs-as-form-controls.english.md b/curriculum/challenges/english/03-front-end-libraries/bootstrap/style-text-inputs-as-form-controls.english.md
index b155b48368..de5cc11b6f 100644
--- a/curriculum/challenges/english/03-front-end-libraries/bootstrap/style-text-inputs-as-form-controls.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/bootstrap/style-text-inputs-as-form-controls.english.md
@@ -93,7 +93,7 @@ tests:
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <div class="row">
       <div class="col-xs-6">
         <label><input type="radio" name="indoor-outdoor"> Indoor</label>
@@ -177,7 +177,7 @@ tests:
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <div class="row">
       <div class="col-xs-6">
         <label><input type="radio" name="indoor-outdoor"> Indoor</label>
diff --git a/curriculum/challenges/english/03-front-end-libraries/bootstrap/taste-the-bootstrap-button-color-rainbow.english.md b/curriculum/challenges/english/03-front-end-libraries/bootstrap/taste-the-bootstrap-button-color-rainbow.english.md
index c6c3503fa5..6f6ddcd0f2 100644
--- a/curriculum/challenges/english/03-front-end-libraries/bootstrap/taste-the-bootstrap-button-color-rainbow.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/bootstrap/taste-the-bootstrap-button-color-rainbow.english.md
@@ -88,7 +88,7 @@ tests:
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label><input type="radio" name="indoor-outdoor"> Indoor</label>
     <label><input type="radio" name="indoor-outdoor"> Outdoor</label>
     <label><input type="checkbox" name="personality"> Loving</label>
@@ -158,7 +158,7 @@ tests:
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label><input type="radio" name="indoor-outdoor"> Indoor</label>
     <label><input type="radio" name="indoor-outdoor"> Outdoor</label>
     <label><input type="checkbox" name="personality"> Loving</label>
diff --git a/curriculum/challenges/english/03-front-end-libraries/bootstrap/use-a-span-to-target-inline-elements.english.md b/curriculum/challenges/english/03-front-end-libraries/bootstrap/use-a-span-to-target-inline-elements.english.md
index c8c1d308aa..70df1759f3 100644
--- a/curriculum/challenges/english/03-front-end-libraries/bootstrap/use-a-span-to-target-inline-elements.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/bootstrap/use-a-span-to-target-inline-elements.english.md
@@ -92,7 +92,7 @@ tests:
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label><input type="radio" name="indoor-outdoor"> Indoor</label>
     <label><input type="radio" name="indoor-outdoor"> Outdoor</label>
     <label><input type="checkbox" name="personality"> Loving</label>
@@ -159,7 +159,7 @@ tests:
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label><input type="radio" name="indoor-outdoor"> Indoor</label>
     <label><input type="radio" name="indoor-outdoor"> Outdoor</label>
     <label><input type="checkbox" name="personality"> Loving</label>
diff --git a/curriculum/challenges/english/03-front-end-libraries/bootstrap/use-responsive-design-with-bootstrap-fluid-containers.english.md b/curriculum/challenges/english/03-front-end-libraries/bootstrap/use-responsive-design-with-bootstrap-fluid-containers.english.md
index 286fdf3802..75cfb92c89 100644
--- a/curriculum/challenges/english/03-front-end-libraries/bootstrap/use-responsive-design-with-bootstrap-fluid-containers.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/bootstrap/use-responsive-design-with-bootstrap-fluid-containers.english.md
@@ -89,7 +89,7 @@ tests:
   <li>thunder</li>
   <li>other cats</li>
 </ol>
-<form action="/submit-cat-photo">
+<form action="https://freecatphotoapp.com/submit-cat-photo">
   <label><input type="radio" name="indoor-outdoor"> Indoor</label>
   <label><input type="radio" name="indoor-outdoor"> Outdoor</label>
   <label><input type="checkbox" name="personality"> Loving</label>
@@ -155,7 +155,7 @@ tests:
   <li>thunder</li>
   <li>other cats</li>
 </ol>
-<form action="/submit-cat-photo">
+<form action="https://freecatphotoapp.com/submit-cat-photo">
   <label><input type="radio" name="indoor-outdoor"> Indoor</label>
   <label><input type="radio" name="indoor-outdoor"> Outdoor</label>
   <label><input type="checkbox" name="personality"> Loving</label>
diff --git a/curriculum/challenges/english/03-front-end-libraries/bootstrap/use-the-bootstrap-grid-to-put-elements-side-by-side.english.md b/curriculum/challenges/english/03-front-end-libraries/bootstrap/use-the-bootstrap-grid-to-put-elements-side-by-side.english.md
index 320dc0f415..2b3c97e79e 100644
--- a/curriculum/challenges/english/03-front-end-libraries/bootstrap/use-the-bootstrap-grid-to-put-elements-side-by-side.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/bootstrap/use-the-bootstrap-grid-to-put-elements-side-by-side.english.md
@@ -95,7 +95,7 @@ tests:
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label><input type="radio" name="indoor-outdoor"> Indoor</label>
     <label><input type="radio" name="indoor-outdoor"> Outdoor</label>
     <label><input type="checkbox" name="personality"> Loving</label>
@@ -176,7 +176,7 @@ tests:
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label><input type="radio" name="indoor-outdoor"> Indoor</label>
     <label><input type="radio" name="indoor-outdoor"> Outdoor</label>
     <label><input type="checkbox" name="personality"> Loving</label>
diff --git a/curriculum/challenges/english/03-front-end-libraries/bootstrap/warn-your-users-of-a-dangerous-action-with-btn-danger.english.md b/curriculum/challenges/english/03-front-end-libraries/bootstrap/warn-your-users-of-a-dangerous-action-with-btn-danger.english.md
index a176b2ed2b..097a8b74ee 100644
--- a/curriculum/challenges/english/03-front-end-libraries/bootstrap/warn-your-users-of-a-dangerous-action-with-btn-danger.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/bootstrap/warn-your-users-of-a-dangerous-action-with-btn-danger.english.md
@@ -91,7 +91,7 @@ tests:
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label><input type="radio" name="indoor-outdoor"> Indoor</label>
     <label><input type="radio" name="indoor-outdoor"> Outdoor</label>
     <label><input type="checkbox" name="personality"> Loving</label>
@@ -163,7 +163,7 @@ tests:
     <li>thunder</li>
     <li>other cats</li>
   </ol>
-  <form action="/submit-cat-photo">
+  <form action="https://freecatphotoapp.com/submit-cat-photo">
     <label><input type="radio" name="indoor-outdoor"> Indoor</label>
     <label><input type="radio" name="indoor-outdoor"> Outdoor</label>
     <label><input type="checkbox" name="personality"> Loving</label>