HTTP 101 Switching Protocols vs 501 Not Implemented
HTTP 101 (Switching Protocols) is a 1xx Informational response, while 501 (Not Implemented) is a 5xx Server Error response. 101 indicates that the server understands the Upgrade header field request and indicates which protocol it is switching to. In contrast, 501 means that the server does not support the functionality required to fulfill the request. The server either does not recognize the request method or lacks the ability to fulfill it.
Descripción
The server understands the Upgrade header field request and indicates which protocol it is switching to.
Cuándo lo verás
When upgrading from HTTP/1.1 to WebSocket, or to HTTP/2.
Cómo solucionarlo
This is normal behavior during protocol upgrades. Ensure your client supports the target protocol.
Descripción
The server does not support the functionality required to fulfill the request. The server either does not recognize the request method or lacks the ability to fulfill it.
Cuándo lo verás
When using an HTTP method (like PATCH) that the server doesn't support.
Cómo solucionarlo
Use a different HTTP method that the server supports. Check server documentation.
Diferencias clave
101 is a 1xx Informational response, while 501 is a 5xx Server Error response.
HTTP 101: The server understands the Upgrade header field request and indicates which protocol it is switching to.
HTTP 501: The server does not support the functionality required to fulfill the request. The server either does not recognize the request method or lacks the ability to fulfill it.
You encounter 101 when when upgrading from HTTP/1.1 to WebSocket, or to HTTP/2.
You encounter 501 when when using an HTTP method (like PATCH) that the server doesn't support.
Cuándo usar cada uno
For 101 (Switching Protocols): This is normal behavior during protocol upgrades. Ensure your client supports the target protocol. For 501 (Not Implemented): Use a different HTTP method that the server supports. Check server documentation.