fix: close socket when client error handled (#9816)

Author: liuweifeng

Diff for: packages/vite/src/node/http.ts

@@ -190,13 +190,19 @@ export function setClientErrorHandler(
   logger: Logger
 ): void {
   server.on('clientError', (err, socket) => {
+    let msg = '400 Bad Request'
     if ((err as any).code === 'HPE_HEADER_OVERFLOW') {
+      msg = '431 Request Header Fields Too Large'
       logger.warn(
         colors.yellow(
           'Server responded with status code 431. ' +
             'See https://vitejs.dev/guide/troubleshooting.html#_431-request-header-fields-too-large.'
         )
       )
     }
+    if ((err as any).code === 'ECONNRESET' || !socket.writable) {
+      return
+    }
+    socket.end(`HTTP/1.1 ${msg}\r\n\r\n`)
   })
 }