HTTP Status Codes Reference
LiveComplete HTTP status codes reference — search all HTTP response codes (1xx–5xx) with descriptions, meanings, and usage guides for every status code.
Understanding HTTP Status Codes
HTTP status codes are standardized three-digit responses that every web server sends to indicate the outcome of a client request. The first digit defines the response class: 1xx (informational), 2xx (success), 3xx (redirection), 4xx (client errors), and 5xx (server errors). Each specific code — from 200 OK to 503 Service Unavailable — conveys precise meaning that API consumers, browsers, caching layers, and monitoring systems interpret to determine next steps. Using incorrect status codes breaks HTTP semantics, confuses API clients, and undermines caching strategies.
A comprehensive, searchable reference of all HTTP status codes and HTTP response codes. Browse every status code organized by class — 1xx Informational, 2xx Success, 3xx Redirection, 4xx Client Error, and 5xx Server Error. Each HTTP status code includes a clear description, common use cases, related headers, and troubleshooting tips. Quickly look up what any HTTP response code means — from 200 OK and 301 Redirect to 403 Forbidden (not allowed), 404 Not Found, and 500 Internal Server Error. Use the search to filter by code number, name, or description. Essential for debugging HTTP errors, understanding API responses, and building web applications.
The Devkitr HTTP Status Codes Reference provides a searchable, categorized guide to every HTTP status code with its meaning, when to use it, and common implementation patterns. Filter by code number, category, or description to quickly find the right status code for your API response or understand a code you received during debugging.
In a typical development workflow, HTTP Status Codes Reference becomes valuable whenever you need to complete http status codes reference. Whether you are working on a personal side project, maintaining production applications for a company, or collaborating with a distributed team across time zones, having a reliable browser-based inspection tool eliminates the need to install desktop software, write one-off scripts, or send data to third-party services that may log or retain your information. Since HTTP Status Codes Reference processes everything locally on your device, your data stays private and your workflow stays uninterrupted — open a browser tab, paste your input, get your result.
Key Features
Comprehensive Code Database
Covers every standard HTTP status code from 100 Continue through 511 Network Authentication Required, including rarely used codes.
Category Filtering
Filter by response class — 2xx success codes, 3xx redirects, 4xx client errors, or 5xx server errors — to narrow the reference to your context.
Usage Guidelines
Each code includes when to use it, what it means semantically, and which codes are commonly confused with each other.
Search by Description
Search by keyword ("authentication", "not found", "rate limit") to find the appropriate status code for your specific response scenario.
How to Use HTTP Status Codes Reference
Search or Browse
Enter a status code number to look up its meaning, or search by keyword to find the code for a specific scenario.
Read the Description
Each code includes its official name, meaning, when to use it, and how clients and browsers interpret it.
Compare Similar Codes
Review commonly confused code pairs (401 vs 403, 301 vs 302, 404 vs 410) to choose the semantically correct response.
Apply to Your API
Use the correct status code in your API responses to follow HTTP semantics and enable proper client handling.
Use Cases
Choosing API Response Codes
Look up the correct status code when building API endpoints — should a missing resource return 404, 204, or 410?
Debugging Unexpected HTTP Responses
When your API returns an unexpected status code, look up its meaning to understand what the server is communicating.
Implementing Error Handling
Reference status code categories to write comprehensive error handling that responds appropriately to each class of HTTP error.
Configuring Monitoring and Alerting
Set up alerts for specific status codes (5xx for server errors, 429 for rate limiting) with accurate understanding of what each triggers.
Pro Tips
Return 201 Created (not 200 OK) for POST requests that create resources, and include a Location header pointing to the new resource.
Use 204 No Content for successful DELETE operations and updates that return no response body — not 200 with an empty body.
Return 429 Too Many Requests with a Retry-After header when rate limiting, so clients know when they can retry safely.
Use 422 Unprocessable Entity for validation errors (the request is syntactically valid JSON but the data fails business rules) instead of 400 Bad Request.
Common Pitfalls
Returning 200 OK for all responses and putting error information only in the body
Fix: Use proper HTTP status codes (400, 401, 404, 500) so clients, proxies, and monitoring tools can route and process responses correctly without parsing the body.
Using 401 Unauthorized when the user is authenticated but lacks permission
Fix: 401 means "not authenticated" (needs login). 403 Forbidden means "authenticated but not authorized" (has a role but wrong permissions).
Using 302 Found for permanent URL changes instead of 301
Fix: 302 is temporary (search engines keep indexing the old URL). Use 301 Moved Permanently for permanent URL changes so search engines update their index.
Frequently Asked Questions
QWhat are HTTP status codes?
HTTP status codes are three-digit response codes returned by a server to indicate the result of an HTTP request. They are grouped into 5 classes: 1xx (Informational), 2xx (Success), 3xx (Redirection), 4xx (Client Error), and 5xx (Server Error). Understanding these codes is essential for debugging HTTP errors and API responses.
QHow many HTTP status codes are there?
There are about 60 officially defined HTTP status codes. The most common ones include 200 OK, 301 Moved Permanently, 400 Bad Request, 401 Unauthorized, 403 Forbidden, 404 Not Found, and 500 Internal Server Error.
QWhat is the difference between 401 and 403?
401 Unauthorized means authentication is required — the request lacks valid credentials. 403 Forbidden (not allowed) means you are authenticated but do not have permission to access the resource. Both are HTTP client error status codes.
QWhat does a 500 status code mean?
500 Internal Server Error is an HTTP status code indicating the server encountered an unexpected condition. It's a generic server error response when no more specific 5xx code applies. Check server logs for the root cause.
QHow do I fix HTTP errors?
Each HTTP error code points to a specific issue. 4xx errors indicate client-side problems (wrong URL, missing auth, bad request). 5xx errors indicate server-side issues. This reference explains each status code with troubleshooting guidance.
QCan I search for a specific status code?
Yes. Use the search box to filter by code number, name, or description to quickly find any HTTP status code and its meaning.
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