data/knowledge/webs/http_status_codes.md

HTTP Status Codes

Success Codes (2xx)

Code	Name	Description
200	OK	Standard success response
201	Created	Resource successfully created
202	Accepted	Request accepted for processing
204	No Content	Success with no body
206	Partial Content	Returning partial data

Redirection Codes (3xx)

Code	Name	Description
301	Moved Permanently	Resource moved permanently
302	Found	Temporary redirect
303	See Other	Redirect to different URL
304	Not Modified	Use cached version
307	Temporary Redirect	Temporary redirect
308	Permanent Redirect	Permanent redirect

Client Error Codes (4xx)

Code	Name	Description
400	Bad Request	Invalid request syntax
401	Unauthorized	Authentication required
402	Payment Required	Reserved for future use
403	Forbidden	Authenticated but not permitted
404	Not Found	Resource doesn't exist
405	Method Not Allowed	HTTP method not supported
406	Not Acceptable	Cannot produce acceptable response
408	Request Timeout	Client took too long
409	Conflict	Request conflicts with state
410	Gone	Resource permanently removed
413	Payload Too Large	Request body exceeds limit
414	URI Too Long	URL exceeds max length
415	Unsupported Media Type	Invalid content type
422	Unprocessable Entity	Validation failed
429	Too Many Requests	Rate limit exceeded

Server Error Codes (5xx)

Code	Name	Description
500	Internal Server Error	Generic server error
501	Not Implemented	Feature not implemented
502	Bad Gateway	Invalid response from gateway
503	Service Unavailable	Server temporarily down
504	Gateway Timeout	Gateway timeout
507	Insufficient Storage	Storage limit reached
511	Network Authentication	Requires auth on network

Common Use Cases

200 OK

// Standard response
{
    "data": {...}
}

201 Created

// With created resource
{
    "data": {
        "id": 123,
        "name": "New Item"
    }
}
// Headers: Location: /resources/123

400 Bad Request

{
    "error": {
        "code": "VALIDATION_ERROR",
        "message": "Invalid input",
        "details": [...]
    }
}

401 Unauthorized

{
    "error": {
        "code": "AUTH_REQUIRED",
        "message": "Please login to continue"
    }
}

403 Forbidden

{
    "error": {
        "code": "PERMISSION_DENIED",
        "message": "You don't have access to this resource"
    }
}

404 Not Found

{
    "error": {
        "code": "NOT_FOUND",
        "message": "Resource not found"
    }
}

429 Too Many Requests

{
    "error": {
        "code": "RATE_LIMITED",
        "message": "Too many requests",
        "retryAfter": 60
    }
}
// Headers: Retry-After: 60

500 Internal Server Error

{
    "error": {
        "code": "INTERNAL_ERROR",
        "message": "Something went wrong"
    }
}

Response Headers

Standard Headers

Content-Type: application/json
Content-Length: 1234
Connection: keep-alive
Cache-Control: max-age=3600

Rate Limiting Headers

X-RateLimit-Limit: 100
X-RateLimit-Remaining: 95
X-RateLimit-Reset: 1640000000

Pagination Headers

Link: <https://api.com/users?page=2>; rel="next",
      <https://api.com/users?page=5>; rel="last"

Security Best Practices

1. Never reveal internal error details in production
2. Use generic error messages for 500 errors
3. Log detailed errors server-side
4. Return appropriate status codes
5. Include error codes for client handling