HTTP Status Code Quick Reference
Processed in your browser
Comprehensive RFC reference guide for HTTP 1xx, 2xx, 3xx, 4xx, and 5xx status codes with caching rules and debugging guidance.
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Direct In-Browser Handoff
HTTP API & Protocol Diagnostics Suite
Chain this tool with complementary private browser utilities for a complete zero-server workflow:
Helpful Examples
Search 404
Instant explanation of 404 Not Found.
404How to Use the HTTP Status Code Quick Reference
Fast, filterable developer reference for HTTP/1.1 and HTTP/2 status codes. Search by code number, name, or description. Displays RFC specifications, RESTful caching behaviors, and actionable debugging advice.
Privacy & Data Processing Notice
No user data leaves your browser. Computation is executed entirely on your device. We do not store, view, or transmit your inputs over our network. Your computation remains on your personal machine.
Frequently Asked Questions
What is the difference between 401 Unauthorized and 403 Forbidden?
401 indicates authentication is required or credentials were invalid. 403 indicates authentication succeeded, but the user does not possess authorization permissions to access the resource.
Related Utilities
Frequently paired browser tools in Network & Internet Tools