Fix #81305: Built-in Webserver Drops Requests With "Upgrade" Header

sapi/cli/php_http_parser.c

@@ -1339,11 +1339,16 @@ size_t php_http_parser_execute (php_http_parser *parser,
           }
         }
 
+        /* We cannot meaningfully support upgrade requests, since we only
+         * support HTTP/1 for now.
+         */
+#if 0
         /* Exit, the rest of the connect is in a different protocol. */
         if (parser->upgrade) {
           CALLBACK2(message_complete);
           return (p - data);
         }
+#endif
 
         if (parser->flags & F_SKIPBODY) {
           CALLBACK2(message_complete);

sapi/cli/tests/bug81305.phpt

@@ -0,0 +1,36 @@
+--TEST--
+Bug #81305 (Built-in Webserver Drops Requests With "Upgrade" Header)
+--SKIPIF--
+<?php
+include "skipif.inc";
+?>
+--FILE--
+<?php
+include "php_cli_server.inc";
+php_cli_server_start();
+
+$host = PHP_CLI_SERVER_HOSTNAME;
+$fp = php_cli_server_connect();
+
+if (fwrite($fp, <<<HEADER
+GET / HTTP/1.1
+Host: {$host}
+Upgrade: HTTP/2.0
+Connection: upgrade
+
+
+HEADER)) {
+	fpassthru($fp);
+}
+
+fclose($fp);
+?>
+--EXPECTF--
+HTTP/1.1 200 OK
+Host: %s
+Date: %s
+Connection: close
+X-Powered-By: PHP/%s
+Content-type: text/html; charset=UTF-8
+
+Hello world