HTTP 101 Switching Protocols vs 405 Method Not Allowed
HTTP 101 (Switching Protocols) is a 1xx Informational response, while 405 (Method Not Allowed) 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, 405 means that the HTTP method is not allowed for the requested resource. The response includes an Allow header listing valid methods.
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 HTTP method is not allowed for the requested resource. The response includes an Allow header listing valid methods.
Cuándo lo verás
When sending POST to a read-only endpoint, or DELETE to a non-deletable resource.
Cómo solucionarlo
Check the Allow response header for supported methods. Use the correct HTTP method.
Diferencias clave
101 is a 1xx Informational response, while 405 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 405: The HTTP method is not allowed for the requested resource. The response includes an Allow header listing valid methods.
You encounter 101 when when upgrading from HTTP/1.1 to WebSocket, or to HTTP/2.
You encounter 405 when when sending POST to a read-only endpoint, or DELETE to a non-deletable resource.
Cuándo usar cada uno
For 101 (Switching Protocols): This is normal behavior during protocol upgrades. Ensure your client supports the target protocol. For 405 (Method Not Allowed): Check the Allow response header for supported methods. Use the correct HTTP method.