WebSocket Online Test Tool
Online WebSocket connection test, message sending and receiving debugging tool
What is WebSocket?
WebSocket is a protocol for full-duplex communication over a single TCP connection. Unlike HTTP, once a WebSocket connection is established, both client and server can send data at any time without repeatedly establishing connections. WebSocket is commonly used for real-time chat, online games, stock quotes, collaborative editing, and other scenarios requiring real-time data exchange.
How to Use
- Enter the WebSocket server address in the URL field (ws:// or wss://)
- Optional: enter subprotocols, separated by commas for multiple
- Click 'Connect' to establish WebSocket connection
- Enter the message content in the input field
- Select message type (Text or JSON), JSON type will auto-validate format
- Click 'Send' or press Ctrl + Enter to send message
- View sent and received messages in the message list, click to copy
Frequently Asked Questions (FAQ)
Q: What's the difference between WebSocket and HTTP?
A: WebSocket is a full-duplex protocol - once connected, both server and client can send data anytime. HTTP is request-response mode where each communication requires client to initiate request. WebSocket is better suited for real-time data exchange scenarios.
Q: What's the difference between ws:// and wss://?
A: ws:// is unencrypted WebSocket connection, similar to HTTP. wss:// is encrypted WebSocket connection, similar to HTTPS, with more secure data transmission. It's recommended to use wss:// in production environments.
Q: What is subprotocol?
A: Subprotocol is a protocol identifier negotiated during WebSocket handshake to agree on communication format. For example, 'json' indicates using JSON format. Server can verify if client's requested subprotocol is supported.
Q: Why does connection fail?
A: Possible reasons: wrong URL format, server not running, firewall blocking, CORS restrictions (browser security policy), certificate issues (wss://). Please check server configuration and network environment.