HTTP Status Code Reference
Complete guide with 87+ status codes including official IANA registry and popular extensions
When to Use HTTP Status Code Reference
API Development
Design REST APIs with proper status codes to communicate response states clearly to client applications and improve API usability.
Debugging Web Issues
Troubleshoot website problems by understanding what different status codes mean and how to resolve common errors like 404, 500, or 403.
Server Configuration
Configure web servers and load balancers to return appropriate status codes for different scenarios, improving user experience and SEO.
Error Handling
Implement proper error handling in applications by understanding which status codes to use for different error conditions.
Testing & QA
Validate web applications and APIs during testing by checking for correct status code responses in different scenarios.
Learning & Reference
Study HTTP protocol fundamentals and keep a handy reference for status codes while learning web development or preparing for interviews.
Frequently Asked Questions
What are HTTP status codes?
HTTP status codes are three-digit numbers returned by web servers to indicate the result of a client's request. They are grouped into five classes: 1xx (Informational), 2xx (Success), 3xx (Redirection), 4xx (Client Error), and 5xx (Server Error). These codes help developers and systems understand what happened with an HTTP request.
What does status code 404 mean?
Status code 404 means "Not Found" and indicates that the server cannot find the requested resource. This is the most common client error status code and typically occurs when a user tries to access a webpage or file that doesn't exist or has been moved without proper redirection.
What is the difference between 4xx and 5xx errors?
4xx errors indicate client-side problems where the request was incorrect or cannot be fulfilled due to client issues (bad request, unauthorized access, not found). 5xx errors indicate server-side issues where the server failed to fulfill a valid request due to internal problems (server error, bad gateway, service unavailable).
How do I use this HTTP status code tool?
You can search for specific status codes using the search box, filter by category (1xx-5xx), or browse the complete list. The tool provides instant search results with detailed descriptions, common causes, and solutions for each status code. Simply type a code number or description to find what you're looking for.
What does status code 200 mean?
Status code 200 means "OK" and indicates that the request was successful. It's the standard response for successful HTTP requests and means the server has successfully processed the request and is returning the requested content.
Is this HTTP status code reference tool free to use?
Yes, this tool is completely free to use with no registration required. You can search, filter, and reference HTTP status codes without any limitations. The tool works entirely in your browser and doesn't require any downloads or installations.
What are the most common HTTP status codes?
The most commonly encountered HTTP status codes are: 200 (OK), 301/302 (Redirect), 400 (Bad Request), 401 (Unauthorized), 403 (Forbidden), 404 (Not Found), 500 (Internal Server Error), and 503 (Service Unavailable). Understanding these codes covers most web development and troubleshooting scenarios.
How should I handle different status codes in my application?
Handle status codes appropriately: 2xx codes indicate success, 3xx require following redirects, 4xx need client-side fixes (show user-friendly error messages), and 5xx require server-side investigation. Always provide meaningful error messages to users and log detailed information for debugging purposes.
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