HTTP 101 Switching Protocols vs 400 Bad Request
HTTP 101 (Switching Protocols) is a 1xx Informational response, while 400 (Bad Request) is a 4xx Client Error response. 101 indicates that the server understands the Upgrade header field request and indicates which protocol it is switching to. In contrast, 400 means that the server cannot process the request due to malformed syntax, invalid request message framing, or deceptive request routing.
描述
The server understands the Upgrade header field request and indicates which protocol it is switching to.
何时出现
When upgrading from HTTP/1.1 to WebSocket, or to HTTP/2.
如何修复
This is normal behavior during protocol upgrades. Ensure your client supports the target protocol.
描述
The server cannot process the request due to malformed syntax, invalid request message framing, or deceptive request routing.
何时出现
When sending malformed JSON, missing required fields, or invalid query parameters.
如何修复
Check the request body format, validate all required fields, and ensure proper encoding.
主要区别
101 is a 1xx Informational response, while 400 is a 4xx Client Error response.
HTTP 101: The server understands the Upgrade header field request and indicates which protocol it is switching to.
HTTP 400: The server cannot process the request due to malformed syntax, invalid request message framing, or deceptive request routing.
You encounter 101 when when upgrading from HTTP/1.1 to WebSocket, or to HTTP/2.
You encounter 400 when when sending malformed JSON, missing required fields, or invalid query parameters.
何时使用哪个
For 101 (Switching Protocols): This is normal behavior during protocol upgrades. Ensure your client supports the target protocol. For 400 (Bad Request): Check the request body format, validate all required fields, and ensure proper encoding.