WebSocket is a protocol that enables two-way communication in web applications. It does this by using the HTTP protocol for the initial handshake and then upgrading to a WebSocket connection. However, sometimes in WebSocket server applications written in PHP, you may encounter "Error during WebSocket handshake: Invalid status line" (WebSocket handshake: Invalid status line) problem. This article details the cause of this problem and provides corresponding source code examples.
The reason for the "Error during WebSocket handshake: Invalid status line" error is usually because the response returned by the WebSocket server does not comply with the specifications of the WebSocket protocol. During the WebSocket handshake, the client sends an HTTP request with a specific format, and the server should return an HTTP response that conforms to the specification. Therefore, we need to ensure that the server application handles the handshake request correctly and returns a valid HTTP response.
Below is a simple PHP WebSocket server example that shows how to handle WebSocket handshake requests and return a correct HTTP response:
<?php
// 建立WebSocket服务器
$server = new \WebSocket