fix: allow ping to http from https website (#9561)

packages/vite/src/client/client.ts

@@ -101,7 +101,7 @@ function setupWebSocket(
     }
 
     console.log(`[vite] server connection lost. polling for restart...`)
-    await waitForSuccessfulPing(hostAndPath)
+    await waitForSuccessfulPing(protocol, hostAndPath)
     location.reload()
   })
 
@@ -292,14 +292,22 @@ async function queueUpdate(p: Promise<(() => void) | undefined>) {
   }
 }
 
-async function waitForSuccessfulPing(hostAndPath: string, ms = 1000) {
+async function waitForSuccessfulPing(
+  socketProtocol: string,
+  hostAndPath: string,
+  ms = 1000
+) {
+  const pingHostProtocol = socketProtocol === 'wss' ? 'https' : 'http'
+
   // eslint-disable-next-line no-constant-condition
   while (true) {
     try {
       // A fetch on a websocket URL will return a successful promise with status 400,
       // but will reject a networking error.
       // When running on middleware mode, it returns status 426, and an cors error happens if mode is not no-cors
-      await fetch(`${location.protocol}//${hostAndPath}`, { mode: 'no-cors' })
+      await fetch(`${pingHostProtocol}://${hostAndPath}`, {
+        mode: 'no-cors'
+      })
       break
     } catch (e) {
       // wait ms before attempting to ping again