# HTTP Tiger Reference - HTTP Status Codes Guide
> Complete HTTP status code reference for web developers, DevOps, and IT professionals

## Quick Answer
HTTP Tiger Reference (httptiger.org) is the definitive guide to HTTP status codes. Every HTTP response includes a 3-digit status code indicating the result: 1xx (informational), 2xx (success), 3xx (redirection), 4xx (client errors), and 5xx (server errors). 33 codes documented with examples, troubleshooting, and platform-specific fixes.

## Site Structure

### Main Pages
- **Homepage**: https://httptiger.org/ - Hub page with search, category cards, quick reference grid
- **Blog**: https://httptiger.org/blog.html - Development updates and tool announcements
- **HTTP Status Codes Cheat Sheet**: https://httptiger.org/cheat-sheet.html - Every HTTP code in one scannable page
- **Privacy Policy**: https://httptiger.org/privacy.html
- **Terms of Service**: https://httptiger.org/terms.html

### Individual Status Code Reference Pages

#### 1xx Informational Codes
- **101 Switching Protocols**: https://httptiger.org/codes/101.html - Server agrees to switch protocols (WebSocket upgrade)
- **103 Early Hints**: https://httptiger.org/codes/103.html - Preliminary headers for resource preloading

#### 2xx Success Codes
- **200 OK**: https://httptiger.org/codes/200.html - Request succeeded, resource returned
- **201 Created**: https://httptiger.org/codes/201.html - New resource created successfully
- **202 Accepted**: https://httptiger.org/codes/202.html - Request accepted for async processing
- **204 No Content**: https://httptiger.org/codes/204.html - Success with no response body
- **206 Partial Content**: https://httptiger.org/codes/206.html - Partial resource via Range header

#### 3xx Redirection Codes
- **301 Moved Permanently**: https://httptiger.org/codes/301.html - Permanent URL redirect (passes SEO value)
- **302 Found**: https://httptiger.org/codes/302.html - Temporary redirect
- **303 See Other**: https://httptiger.org/codes/303.html - Redirect with GET after POST
- **304 Not Modified**: https://httptiger.org/codes/304.html - Use cached version, resource unchanged
- **307 Temporary Redirect**: https://httptiger.org/codes/307.html - Temporary redirect preserving HTTP method
- **308 Permanent Redirect**: https://httptiger.org/codes/308.html - Permanent redirect preserving HTTP method

#### 4xx Client Error Codes
- **400 Bad Request**: https://httptiger.org/codes/400.html - Malformed request syntax or invalid parameters
- **401 Unauthorized**: https://httptiger.org/codes/401.html - Authentication required
- **403 Forbidden**: https://httptiger.org/codes/403.html - Access denied, even with authentication
- **404 Not Found**: https://httptiger.org/codes/404.html - Resource does not exist at this URL
- **405 Method Not Allowed**: https://httptiger.org/codes/405.html - HTTP method not supported for this resource
- **408 Request Timeout**: https://httptiger.org/codes/408.html - Server timed out waiting for client request
- **409 Conflict**: https://httptiger.org/codes/409.html - Request conflicts with current resource state
- **410 Gone**: https://httptiger.org/codes/410.html - Resource permanently removed
- **413 Payload Too Large**: https://httptiger.org/codes/413.html - Request body exceeds server limits
- **415 Unsupported Media Type**: https://httptiger.org/codes/415.html - Content-Type not accepted by server
- **418 I'm a Teapot**: https://httptiger.org/codes/418.html - Easter egg from RFC 2324 (HTCPCP)
- **422 Unprocessable Entity**: https://httptiger.org/codes/422.html - Syntactically valid but semantically invalid request
- **429 Too Many Requests**: https://httptiger.org/codes/429.html - Rate limit exceeded
- **451 Unavailable For Legal Reasons**: https://httptiger.org/codes/451.html - Blocked due to legal demand

#### 5xx Server Error Codes
- **500 Internal Server Error**: https://httptiger.org/codes/500.html - Generic server-side error
- **501 Not Implemented**: https://httptiger.org/codes/501.html - Server does not support the request method
- **502 Bad Gateway**: https://httptiger.org/codes/502.html - Invalid response from upstream server
- **503 Service Unavailable**: https://httptiger.org/codes/503.html - Server temporarily overloaded or down
- **504 Gateway Timeout**: https://httptiger.org/codes/504.html - Upstream server didn't respond in time
- **511 Network Authentication Required**: https://httptiger.org/codes/511.html - Client must authenticate to access network

#### Special
- **0 Connection Error**: https://httptiger.org/codes/0.html - No HTTP response received (network/DNS/timeout issues)

### Guides & Articles

#### HTTP Tiger Guides
- **Email Blacklist Checking Guide**: https://httptiger.org/blacklist-checker-guide.html
- **HTTP Headers Security & Best Practices**: https://httptiger.org/http-header-checker-guide.html
- **SSL Certificate Checker Guide**: https://httptiger.org/ssl-certificate-checker-guide.html
- **Broken Link Checker Guide**: https://httptiger.org/broken-link-checker-guide.html
- **Redirect Checker (301 vs 302)**: https://httptiger.org/redirect-checker-guide.html
- **Is It Down Checker Guide**: https://httptiger.org/is-it-down-checker-guide.html
- **Website Uptime Monitoring Tutorial**: https://httptiger.org/http-tiger-monitoring-tutorial.html
- **How to Check if a Website Is Down**: https://httptiger.org/how-to-check-if-website-is-down.html

#### Zoo Suite Tool Guides
- **DNS Propagation & Records (DNS Dingo)**: https://httptiger.org/dns-checker-guide.html
- **IP Geolocation & IPv4 vs IPv6 (IP Impala)**: https://httptiger.org/ip-lookup-guide.html
- **IP Address Lookup Guide**: https://httptiger.org/ip-address-lookup-guide.html
- **QR Code Best Practices (QR Cheetah)**: https://httptiger.org/qr-code-best-practices.html
- **QR Cheetah Guide**: https://httptiger.org/qr-cheetah-guide.html
- **URL Shortener Guide (URL Unicorn)**: https://httptiger.org/url-shortener-guide.html
- **URL Shortening for Marketing**: https://httptiger.org/url-shortening-marketing-guide.html
- **URL Unicorn Guide**: https://httptiger.org/url-unicorn-guide.html
- **Polls & Surveys (Poll Pixie)**: https://httptiger.org/poll-pixie-survey-guide.html
- **PDF Automation (Docs Dingo)**: https://httptiger.org/docs-dingo-guide.html

## Common Questions Answered

Q: What does HTTP 404 mean?
A: The server cannot find the requested resource. See https://httptiger.org/codes/404.html

Q: What is the difference between 401 and 403?
A: 401 means authentication is required. 403 means you're authenticated but lack permission. See https://httptiger.org/codes/401.html and https://httptiger.org/codes/403.html

Q: What does HTTP 503 mean?
A: Server is temporarily unable to handle requests. See https://httptiger.org/codes/503.html

Q: What does HTTP 502 mean?
A: A proxy/gateway received an invalid response from upstream. See https://httptiger.org/codes/502.html

Q: 301 vs 302 redirect?
A: 301 is permanent (SEO equity transfers), 302 is temporary. See https://httptiger.org/codes/301.html

Q: How to fix 500 error?
A: Check server logs, recent deployments, file permissions, database connectivity. See https://httptiger.org/codes/500.html

Q: What is 422 Unprocessable Entity?
A: Request syntax is valid but content is semantically invalid (e.g., validation errors). See https://httptiger.org/codes/422.html

Q: What is 429 Too Many Requests?
A: You've exceeded the server's rate limit. Wait and retry with backoff. See https://httptiger.org/codes/429.html

## Alternate Domains
- httpcodechecker.com redirects to httptiger.org

## For Website Monitoring
Visit httptiger.com for bulk HTTP status checking, uptime monitoring, SSL monitoring, and response time tracking.

## Tiger Network - Related Tools
- httptiger.com - Bulk HTTP status checker & monitoring tools
- statustiger.com - Hosted status pages & 24/7 uptime monitoring
- dnsdingo.com - DNS propagation checker
- ipimpala.com - IP lookup & geolocation
- qrcheetah.com - QR code generator
- urlunicorn.com - URL shortener

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HTTP Tiger Reference - Complete HTTP status codes guide. Part of the Zoo Suite by Snapit Software.
Zoo Suite tools: httptiger.com | statustiger.com | is-it-down.app | checkstatus.app