feat(web3): add ability to pass different websocket endpoint #17387 (#17556)

web3.js/src/util/url.ts

@@ -0,0 +1,20 @@
+import {format as urlFormat, parse as urlParse} from 'url';
+
+export function makeWebsocketUrl(endpoint: string) {
+  let url = urlParse(endpoint);
+  const useHttps = url.protocol === 'https:';
+
+  url.protocol = useHttps ? 'wss:' : 'ws:';
+  url.host = '';
+
+  // Only shift the port by +1 as a convention for ws(s) only if given endpoint
+  // is explictly specifying the endpoint port (HTTP-based RPC), assuming
+  // we're directly trying to connect to solana-validator's ws listening port.
+  // When the endpoint omits the port, we're connecting to the protocol
+  // default ports: http(80) or https(443) and it's assumed we're behind a reverse
+  // proxy which manages WebSocket upgrade and backend port redirection.
+  if (url.port !== null) {
+    url.port = String(Number(url.port) + 1);
+  }
+  return urlFormat(url);
+}