HTTP 101 Switching Protocols Explained

HTTP 101 Switching Protocols indicates the server is changing protocols as requested by the client. This guide covers everything you need to know about this topic, including common causes, step-by-step solutions, and answers to frequently asked questions.

Here are the key things to understand: Status: 101 Switching Protocols. Category: 1xx Informational. Server agrees to switch protocols. Common with WebSocket upgrades. Understanding these fundamentals will help you diagnose and resolve this issue more effectively.

The most common reasons this occurs include: Client requested protocol upgrade via Upgrade header. WebSocket connection handshake. HTTP/2 upgrade from HTTP/1.1. Server agrees to the protocol change. Identifying the root cause is the first step toward finding the right solution.

To resolve this, follow these recommended steps: Usually seen during WebSocket connections. Verify Upgrade header is set correctly. Check that server supports the requested protocol. Monitor WebSocket connection establishment. If these steps do not resolve the issue, consider consulting additional resources or a qualified professional.

This article is part of our HTTP Status Codes collection on Error Codes Wiki. We provide comprehensive, up-to-date information to help you find solutions quickly.