HTTP Status Codes
Complete reference for HTTP status codes and their meanings with examples and troubleshooting
HTTP Status Codes
Complete reference for HTTP status codes and their meanings with examples and troubleshooting
About HTTP Status Codes
HTTP status codes are three-digit numbers returned by web servers to indicate the result of a client's request. Our comprehensive reference covers all standard HTTP status codes from 100 to 599, including common codes like 200 (OK), 404 (Not Found), and 500 (Internal Server Error), with detailed explanations, examples, and troubleshooting tips.
- Complete 1xx-5xx status code coverage
- Detailed descriptions and use cases
- Common causes and solutions
- Server configuration examples
- SEO and performance implications
Understanding HTTP Status Codes
- 1xx Informational - Request received, server is continuing the process
- 2xx Success - Request was successfully received, understood, and accepted
- 3xx Redirection - Further action needs to be taken to complete the request
- 4xx Client Error - Request contains bad syntax or cannot be fulfilled
- 5xx Server Error - Server failed to fulfill an apparently valid request
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Frequently Asked Questions
What is the most common HTTP status code?
200 OK is the most common HTTP status code, indicating that the request was successful and the server has returned the requested resource. This is the standard response for successful HTTP requests.
What does a 404 error mean?
404 Not Found means the server cannot find the requested resource. This could be due to a broken link, deleted page, incorrect URL, or server misconfiguration. It's one of the most well-known error codes.
How do I fix a 500 Internal Server Error?
500 Internal Server Error indicates a problem on the server side. Common solutions include checking server logs, verifying file permissions, reviewing configuration files, ensuring adequate server resources, and contacting your hosting provider.
What's the difference between 301 and 302 redirects?
301 Moved Permanently indicates the resource has moved permanently to a new URL, while 302 Found indicates a temporary redirect. Search engines treat these differently - 301 passes link equity, while 302 doesn't.
Do HTTP status codes affect SEO?
Yes, HTTP status codes significantly impact SEO. 2xx codes are good for SEO, 3xx redirects should be used carefully, 4xx errors can hurt rankings if numerous, and 5xx errors indicate server problems that search engines penalize.
HTTP Status Code Categories
2xx Success Codes
- 200 OK: Request successful
- 201 Created: Resource created successfully
- 202 Accepted: Request accepted for processing
- 204 No Content: Successful but no content to return
- 206 Partial Content: Range request fulfilled
3xx Redirection Codes
- 301 Moved Permanently: Resource permanently moved
- 302 Found: Temporary redirect
- 304 Not Modified: Resource not modified
- 307 Temporary Redirect: Temporary redirect (method preserved)
- 308 Permanent Redirect: Permanent redirect (method preserved)
4xx Client Error Codes
- 400 Bad Request: Invalid request syntax
- 401 Unauthorized: Authentication required
- 403 Forbidden: Server understands but refuses
- 404 Not Found: Resource not found
- 429 Too Many Requests: Rate limit exceeded
5xx Server Error Codes
- 500 Internal Server Error: Generic server error
- 502 Bad Gateway: Invalid response from upstream
- 503 Service Unavailable: Server temporarily unavailable
- 504 Gateway Timeout: Upstream server timeout
- 505 HTTP Version Not Supported: Unsupported HTTP version
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Troubleshooting Common HTTP Errors
404 Not Found Solutions
- • Check URL spelling and capitalization
- • Verify file exists in correct directory
- • Check server configuration and redirects
- • Review .htaccess rules
- • Clear browser cache and try again
500 Internal Server Error Solutions
- • Check server error logs for details
- • Verify file permissions (typically 644 for files, 755 for folders)
- • Review server configuration files
- • Check for resource limits (memory, CPU)
- • Test with minimal configuration
403 Forbidden Solutions
- • Check file and directory permissions
- • Verify index file exists (index.html, index.php)
- • Review server access rules
- • Check IP restrictions
- • Verify authentication credentials
HTTP Status Codes and SEO
HTTP status codes play a crucial role in SEO by communicating page status to search engines. Understanding their impact helps maintain good search rankings and user experience.
SEO-Friendly Codes
- • 200 OK - Pages indexed normally
- • 301 Redirect - Passes link equity
- • 304 Not Modified - Improves caching
Caution Codes
- • 302 Redirect - Temporary, no equity transfer
- • 404 Errors - Remove from index if persistent
- • 410 Gone - Permanently removed
SEO-Damaging Codes
- • 5xx Errors - Server reliability issues
- • High 4xx rates - Site quality problems
- • Redirect chains - Dilute link equity
Server Configuration Examples
Proper server configuration ensures correct HTTP status codes are returned. Here are common configuration examples for different servers.
Apache .htaccess Examples:
Nginx Configuration Examples:
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