Developer Utilities
HTTP Status Code & Response Header Inspector
Comprehensive search and reference guide for all standard 1xx, 2xx, 3xx, 4xx, and 5xx HTTP status codes and response headers.
1001XX
Continue
The server has received the request headers and the client should proceed to send the body.
Fix / Best Practice: Client should send the payload body upon receiving this interim status.
1011XX
Switching Protocols
The requester has asked the server to switch protocols (e.g. HTTP to WebSockets).
Fix / Best Practice: Connection switches to persistent WebSocket protocol.
2002XX
OK
Standard response for successful HTTP requests.
Fix / Best Practice: No action required.
2012XX
Created
The request has been fulfilled and resulted in a new resource being created.
Fix / Best Practice: Response includes Location header pointing to the created resource.
2042XX
No Content
The server successfully processed the request, but is not returning any content.
Fix / Best Practice: Return 204 for successful updates/deletions requiring no response payload.
3013XX
Moved Permanently
This and all future requests should be directed to the given URL in the Location header.
Fix / Best Practice: Update links and bookmarks. Search engines transfer PageRank to the target URL.
3023XX
Found (Temporary Redirect)
The requested resource resides temporarily under a different URI.
Fix / Best Practice: Do not update bookmarks or search index canonical URLs.
3043XX
Not Modified
Indicates that the resource has not been modified since the version specified by ETag/If-Modified-Since.
Fix / Best Practice: Browser loads cached local copy without re-downloading bytes.
4004XX
Bad Request
The server cannot process the request due to a client error (e.g., malformed syntax).
Fix / Best Practice: Inspect API payload body, JSON syntax, and query parameters.
4014XX
Unauthorized
Authentication is required and has failed or has not yet been provided.
Fix / Best Practice: Pass valid Authorization header (e.g. Bearer token) in request.
4034XX
Forbidden
The server understood the request, but refuses to authorize it.
Fix / Best Practice: Check user roles/permissions, API keys, or CORS headers on server.
4044XX
Not Found
The server cannot find the requested URL path.
Fix / Best Practice: Verify path spelling, configure 301 redirects, or check routing rules.
4294XX
Too Many Requests
The user has sent too many requests in a given amount of time (Rate Limited).
Fix / Best Practice: Implement exponential backoff and inspect Retry-After header.
5005XX
Internal Server Error
The server encountered an unexpected condition that prevented it from fulfilling the request.
Fix / Best Practice: Check server error logs, stack trace, and database connections.
5025XX
Bad Gateway
The server, while acting as a gateway or proxy, received an invalid response from the upstream server.
Fix / Best Practice: Verify backend daemon (PM2, Gunicorn, systemd) is running on expected port.
5035XX
Service Unavailable
The server is currently unable to handle the request due to temporary overload or maintenance.
Fix / Best Practice: Scale server resources, optimize database queries, or check load balancer.
5045XX
Gateway Timeout
The server, acting as a gateway, did not receive a timely response from the upstream server.
Fix / Best Practice: Increase proxy timeout limits or optimize slow database queries/external APIs.
HDRHEADER
Strict-Transport-Security (HSTS)
Forces browsers to connect exclusively via HTTPS for a specified duration.
Fix / Best Practice: Add Strict-Transport-Security: max-age=31536000; includeSubDomains
HDRHEADER
Content-Security-Policy (CSP)
Restricts script, style, image, and frame origins to prevent XSS attacks.
Fix / Best Practice: Configure CSP directives restricting default-src, script-src, and style-src.
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|---|---|---|
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