HTTP 101 Switching Protocols vs 204 No Content
HTTP 101 (Switching Protocols) is a 1xx Informational response, while 204 (No Content) is a 2xx Success response. 101 indicates that the server understands the Upgrade header field request and indicates which protocol it is switching to. In contrast, 204 means that the server successfully processed the request but is not returning any content. Common for DELETE operations and form submissions that don't need a response body.
Descrição
The server understands the Upgrade header field request and indicates which protocol it is switching to.
Quando você o vê
When upgrading from HTTP/1.1 to WebSocket, or to HTTP/2.
Como corrigir
This is normal behavior during protocol upgrades. Ensure your client supports the target protocol.
Descrição
The server successfully processed the request but is not returning any content. Common for DELETE operations and form submissions that don't need a response body.
Quando você o vê
After DELETE requests, PUT updates where no body is needed, or CORS preflight responses.
Como corrigir
No fix needed. The action was successful; there is simply no content to return.
Diferenças principais
101 is a 1xx Informational response, while 204 is a 2xx Success response.
HTTP 101: The server understands the Upgrade header field request and indicates which protocol it is switching to.
HTTP 204: The server successfully processed the request but is not returning any content. Common for DELETE operations and form submissions that don't need a response body.
You encounter 101 when when upgrading from HTTP/1.1 to WebSocket, or to HTTP/2.
You encounter 204 when after DELETE requests, PUT updates where no body is needed, or CORS preflight responses.
Quando usar qual
For 101 (Switching Protocols): This is normal behavior during protocol upgrades. Ensure your client supports the target protocol. For 204 (No Content): No fix needed. The action was successful; there is simply no content to return.