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Common HTTP Status Code Mistakes That Undermine API Reliability

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Misusing HTTP status codes is a widespread problem in API development, with errors like returning 500 for login failures or 403 for missing credentials causing confusion for client developers. The 401 and 403 codes are among the most misused: 401 signals an unauthenticated request, while 403 means the server recognises the user but denies access. Similarly, 404 and 410 serve distinct purposes — 404 indicates a resource is not found, whereas 410 signals deliberate removal, which search engines treat as a stronger deindexing cue. Redirect codes also carry important distinctions, as 301 transfers SEO ranking to a new URL while 302 does not, and 307/308 preserve the HTTP method during redirects. Lesser-used codes like 202 and 204 improve API honesty by accurately conveying asynchronous processing and empty successful responses respectively.

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