Meaning
Client error responses indicate a problem with the request.
Causes
- Request or response flow is affected by the status meaning.
- Headers or request body may require changes.
Fixes
- Validate request parameters and authentication.
- Fix client-side input or URL and retry.
Example
HTTP/1.1 422 Unprocessable Content
FAQ
- Is this my problem or the server’s?
It depends on the status class (4xx vs 5xx). - What should I check first?
Start with the request URL, headers, and body.
Contact
If it persists, contact the service owner.