-when to use HTTP GET
-default for blank attribute
<!-- Please follow this checklist and put an x in each of the boxes, like this: [x]. It will ensure that our team takes your pull request seriously. -->
- [X] I have read [freeCodeCamp's contribution guidelines](https://github.com/freeCodeCamp/freeCodeCamp/blob/master/CONTRIBUTING.md).
- [X] My pull request has a descriptive title (not a vague title like `Update index.md`)
- [X] My pull request targets the `master` branch of freeCodeCamp.
- [X] None of my changes are plagiarized from another source without proper attribution.
- [X] My article does not contain shortened URLs or affiliate links.
009baf06fa