HTTP 101 Switching Protocols vs 431 Request Header Fields Too Large
HTTP 101 (Switching Protocols) is a 1xx Informational response, while 431 (Request Header Fields Too Large) 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, 431 means that the server refuses to process the request because an individual header field or all headers collectively are too large.
คำอธิบาย
The server understands the Upgrade header field request and indicates which protocol it is switching to.
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When upgrading from HTTP/1.1 to WebSocket, or to HTTP/2.
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This is normal behavior during protocol upgrades. Ensure your client supports the target protocol.
คำอธิบาย
The server refuses to process the request because an individual header field or all headers collectively are too large.
เมื่อคุณพบเห็น
When cookies accumulate to an excessive size, or a single header (like Authorization) is too long.
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Reduce header sizes. Clear excessive cookies. Use shorter tokens.
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101 is a 1xx Informational response, while 431 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 431: The server refuses to process the request because an individual header field or all headers collectively are too large.
You encounter 101 when when upgrading from HTTP/1.1 to WebSocket, or to HTTP/2.
You encounter 431 when when cookies accumulate to an excessive size, or a single header (like Authorization) is too long.
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For 101 (Switching Protocols): This is normal behavior during protocol upgrades. Ensure your client supports the target protocol. For 431 (Request Header Fields Too Large): Reduce header sizes. Clear excessive cookies. Use shorter tokens.