HTTP Status Codes Cheat Sheet

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Comprehensive HTTP status code reference with meanings, examples, and debugging guidance.

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## Status Code Classes

HTTP status code classes

↗#

1xx Informational
2xx Success
3xx Redirection
4xx Client Error
5xx Server Error

# Understand the five categories of HTTP responses.

Debug status codes in the right order

↗#

1) Check request method, URL, headers, and body
2) Inspect auth and permissions
3) Follow redirects if needed
4) Check upstream/app logs for 5xx
5) Confirm caching/proxy/CDN behavior

# A quick flow for deciding where a problem lives.

Check headers and status with curl

↗#

curl -I https://example.com

# Inspect the response line and headers only.

See the full request/response exchange

↗#

curl -v https://example.com

# Use verbose mode to diagnose redirects, TLS, and headers.

Follow redirects

↗#

curl -L https://example.com

# Useful for 301, 302, 307, and 308 responses.

## Common API Response Patterns

GET success codes

↗#

200 OK
206 Partial Content
304 Not Modified

# Typical success responses for reads.

Create success codes

↗#

201 Created
202 Accepted
204 No Content

# Typical responses when creating resources.

Authentication and authorization codes

↗#

401 Unauthorized
403 Forbidden
407 Proxy Authentication Required

# The most common auth-related status codes.

Rate limiting and overload codes

↗#

408 Request Timeout
425 Too Early
429 Too Many Requests
503 Service Unavailable

# Responses commonly used when a client must back off.

More in HTTP Status Codes

HTTP Common Errors and Debugging

Common HTTP status code comparisons, cURL debugging recipes, and troubleshooting patterns.

HTTP 5xx Server Error Status Codes

Server error responses like 500, 502, 503, and 504.

HTTP 4xx Client Error Status Codes

Client error responses like 400, 401, 403, 404, 409, 422, and 429.

HTTP 3xx Redirect Status Codes

Redirection responses like 301, 302, 307, and 308.

HTTP 2xx Success Status Codes

Successful responses like 200 OK, 201 Created, and 204 No Content.

HTTP 1xx Informational Status Codes

Informational responses like 100 Continue and 103 Early Hints.

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