Fix #80838: HTTP wrapper waits for HTTP 1 response after HTTP 101

Don't wait for further responses after a HTTP 101 (Switching Protocols) response

Closes GH-6730.

ext/standard/http_fopen_wrapper.c

@@ -680,7 +680,7 @@ finish:
 			/* status codes of 1xx are "informational", and will be followed by a real response
 			 * e.g "100 Continue". RFC 7231 states that unexpected 1xx status MUST be parsed,
 			 * and MAY be ignored. As such, we need to skip ahead to the "real" status*/
-			if (response_code >= 100 && response_code < 200) {
+			if (response_code >= 100 && response_code < 200 && response_code != 101) {
 				/* consume lines until we find a line starting 'HTTP/1' */
 				while (
 					!php_stream_eof(stream)

ext/standard/tests/http/bug80838.phpt

@@ -0,0 +1,41 @@
+--TEST--
+Bug #80838 (HTTP wrapper waits for HTTP 1 response after HTTP 101)
+--INI--
+allow_url_fopen=1
+--SKIPIF--
+<?php require 'server.inc'; http_server_skipif('tcp://127.0.0.1:12342'); ?>
+--FILE--
+<?php
+require 'server.inc';
+
+$responses = [
+  "data://text/plain,HTTP/1.1 101 Switching Protocols\r\nHeader1: Value1\r\nHeader2: Value2\r\n\r\n"
+    . "Hello from another protocol"
+];
+
+$pid = http_server('tcp://127.0.0.1:12342', $responses);
+
+$options = [
+  'http' => [
+    'ignore_errors' => true
+  ],
+];
+
+$ctx = stream_context_create($options);
+
+$fd = fopen('http://127.0.0.1:12342/', 'rb', false, $ctx);
+fclose($fd);
+var_dump($http_response_header);
+
+http_server_kill($pid);
+
+?>
+--EXPECT--
+array(3) {
+  [0]=>
+  string(32) "HTTP/1.1 101 Switching Protocols"
+  [1]=>
+  string(15) "Header1: Value1"
+  [2]=>
+  string(15) "Header2: Value2"
+}