HTTP 400 Bad Request vs 411 Length Required
Both HTTP 400 (Bad Request) and 411 (Length Required) belong to the 4xx Client Error category. 400 indicates that the server cannot process the request due to malformed syntax, invalid request message framing, or deceptive request routing. Meanwhile, 411 means that the server refuses to accept the request without a Content-Length header.
Description
The server cannot process the request due to malformed syntax, invalid request message framing, or deceptive request routing.
When You See It
When sending malformed JSON, missing required fields, or invalid query parameters.
How to Fix
Check the request body format, validate all required fields, and ensure proper encoding.
Description
The server refuses to accept the request without a Content-Length header.
When You See It
When sending a request body without specifying Content-Length.
How to Fix
Include a Content-Length header in your request.
Key Differences
HTTP 400: The server cannot process the request due to malformed syntax, invalid request message framing, or deceptive request routing.
HTTP 411: The server refuses to accept the request without a Content-Length header.
You encounter 400 when when sending malformed JSON, missing required fields, or invalid query parameters.
You encounter 411 when when sending a request body without specifying Content-Length.
When to Use Which
For 400 (Bad Request): Check the request body format, validate all required fields, and ensure proper encoding. For 411 (Length Required): Include a Content-Length header in your request.