HTTP
301 Moved Permanently
The resource has been permanently moved to a new URL. All future requests should use the new URL. Search engines will transfer link equity to the new URL.
When You See This Code
After domain migrations, URL restructuring, or when consolidating duplicate URLs.
How to Fix
Update links and bookmarks to the new URL in the Location header. For SEO, this is the preferred redirect for permanent moves.
Specification
View RFC / Specification →Related Codes
Comparisons
Guides
Understanding HTTP Status Codes: A Complete Guide
HTTP Fundamentals
HTTP Redirects: 301 vs 302 vs 307 vs 308
HTTP Fundamentals
HTTP Caching: Cache-Control, ETags, and 304 Responses
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Choosing the Right HTTP Status Codes for REST APIs
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gRPC Status Codes: A Practical Guide
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Debugging 502 Bad Gateway Errors
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Debugging CORS Errors: A Developer's Guide
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Debugging Timeout Errors: 408 and 504
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401 Unauthorized vs 403 Forbidden: When to Use Each
Security & Authentication
Essential HTTP Security Headers
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Complete Guide to HTTP Methods: GET, POST, PUT, PATCH, DELETE
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Essential HTTP Headers Every Developer Should Know
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HTTP/2 vs HTTP/3: What Changed and Why
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How to Implement and Handle Rate Limiting (429)
API Design
API Versioning Strategies: URL, Header, and Query Param
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Designing Consistent API Error Responses
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Debugging 503 Service Unavailable Errors in Production
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TLS/SSL Certificate Troubleshooting Guide
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OAuth 2.0 Flows Explained: Authorization Code, Client Credentials, PKCE
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JSON Web Tokens: Structure, Signing, and Common Pitfalls
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API Keys vs OAuth vs JWT: Choosing the Right Auth Method
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