curl command converter
Convert literal curl arguments between Bash, PowerShell and Windows cmd.
Format & documents
curlSecurity & network
HTTP status code lookup and troubleshooting
Look up HTTP response codes by number or English/Chinese keywords. Distinguish success, redirects, client errors and server errors with troubleshooting tips.
Loading local tool…
How to use
Filter by code or English/Chinese keywords. 1xx informational, 2xx success, 3xx redirection, 4xx client error, 5xx server error.
Your input stays yours
Step by step
- Enter a code or keyword such as 404, 未找到 or Unauthorized.
- Read the matching meaning; clear the search to restore the list.
- Use response headers, body and service logs to identify the actual cause.
Look up 404
404The result should show Not Found. A status code describes response semantics but does not identify which configuration layer caused it.
Frequently asked questions
How do 401 and 403 differ?
401 indicates missing valid authentication credentials; 403 means the server understands the request but refuses it. Systems may obscure resource details with different responses; check authentication and authorization logs.
How should I investigate 502 and 504?
502 concerns an invalid upstream response at a gateway; 504 concerns an upstream timeout. Correlate gateway and upstream logs at the same time instead of relying on a page refresh alone.
Does 200 always mean business success?
Not necessarily. It indicates HTTP-level success, while an application may report business failure in the body. Check the application status and response structure too.