HTTP 101 Switching Protocols vs 421 Misdirected Request
HTTP 101 (Switching Protocols) is a 1xx Informational response, while 421 (Misdirected 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, 421 means that the request was directed at a server that is unable to produce a response for the combination of scheme and authority in the URI.
विवरण
The server understands the Upgrade header field request and indicates which protocol it is switching to.
जब आप इसे देखें
When upgrading from HTTP/1.1 to WebSocket, or to HTTP/2.
कैसे ठीक करें
This is normal behavior during protocol upgrades. Ensure your client supports the target protocol.
विवरण
The request was directed at a server that is unable to produce a response for the combination of scheme and authority in the URI.
जब आप इसे देखें
With HTTP/2 when a connection is reused for a domain the certificate doesn't cover.
कैसे ठीक करें
Retry the request on a new connection.
मुख्य अंतर
101 is a 1xx Informational response, while 421 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 421: The request was directed at a server that is unable to produce a response for the combination of scheme and authority in the URI.
You encounter 101 when when upgrading from HTTP/1.1 to WebSocket, or to HTTP/2.
You encounter 421 when with HTTP/2 when a connection is reused for a domain the certificate doesn't cover.
कब किसका उपयोग करें
For 101 (Switching Protocols): This is normal behavior during protocol upgrades. Ensure your client supports the target protocol. For 421 (Misdirected Request): Retry the request on a new connection.