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Install guideSearchable reference for all HTTP status codes with descriptions.
Look up HTTP status codes with practical interpretation guidance to speed up API debugging, monitoring triage, and incident communication across engineering teams.
It maps status codes to definitions and operational meaning for common web and API responses.
It helps teams distinguish client, server, and redirect classes quickly during troubleshooting.
It supports faster handoff by turning raw status numbers into actionable diagnostic context.
Single code
429
Error sequence
401 -> 403 -> 200 after token refresh
Incident sample
Spike of 502 and 504 responses on edge gateway
Code definition
429 Too Many Requests: request rate exceeded configured limits.
Action hint
Add backoff/retry and review upstream quota policies.
Class summary
4xx indicates client-side issues, 5xx indicates server-side failure paths.
Treating 304 as an error
304 is a cache validation response and often expected.
Confusing 401 and 403
401 is unauthenticated, while 403 is authenticated but forbidden.
Ignoring retry strategy for 429
Honor Retry-After and implement exponential backoff.
Collapsing all 5xx codes together
Track 500/502/503/504 separately for clearer root-cause analysis.
HTTP Status Codes should be treated as a repeatable validation step before merge, release, and handoff.
Is 404 always a bug?
Not always. It can be expected for expired resources or intentional route removals.
Which status code should rate limiting use?
429 is the standard code for too many requests.
Why does a request return 204 with no body?
204 means success with no response content by design.
Should clients retry 500 errors automatically?
Only selectively, with safeguards and idempotency checks.