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HTTP Status Codes

Developer Tools

1xx-5xx lookup by category with meanings

Quick Answer

HTTP Status Codes: 1xx-5xx lookup by category with meanings. HTTP Status Codes uses standard developer formulas to compute accurate results instantly.

1xxInformational: request received
2xxSuccess: request handled
3xxRedirection: further action needed
4xxClient error: bad request
5xxServer error: processing failed

Codes (26)

CodeNameDescription
100ContinueClient should continue request
101Switching Protocolse.g. upgrade to WebSocket
200OKRequest succeeded
201CreatedResource created
204No ContentSuccess, empty body
206Partial ContentRange request response
301Moved PermanentlySEO juice transferred
302FoundTemporary redirect
304Not ModifiedCache still valid
307Temporary RedirectMethod preserved
308Permanent RedirectPermanent + method preserved
400Bad RequestMalformed syntax
401UnauthorizedMissing credentials
403ForbiddenAuthenticated, no permission
404Not FoundResource not found
405Method Not AllowedHTTP method not supported
408Request TimeoutClient too slow
409Conflicte.g. duplicate creation
410GonePermanently removed
413Payload Too LargeUpload too big
422Unprocessable EntityValidation failed
429Too Many RequestsRate limited
500Internal Server ErrorUncaught server error
502Bad GatewayUpstream failure
503Service UnavailableOverloaded / maintenance
504Gateway TimeoutUpstream timeout
Debugging cheatsheet: 401 = login first; 403 = logged in but denied; 404 = check URL/route; 429 = slow down / retry-after; 502/504 = upstream (not your) problem; CORS errors never show a status — check console.

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How to Use

  1. Paste or type content: drop code/text into the HTTP Status Codes or fill the parameters.
  2. Choose mode/options: switch format, rules or processing as needed.
  3. Live output: results appear instantly — nothing is submitted, data stays in your browser.
  4. One-click copy: copy the output straight into your development environment.

Key Points

  • HTTP Status Codes is a free online developer tool — open and use, no sign-up.
  • All calculations run locally in your browser; your data never leaves the device.
  • Key capability: 1xx-5xx lookup by category with meanings.
  • Results come with formulas and reference tables so you can verify every number.

Formula & How It Works

HTTP Status Codes formula

HTTP Status Codes uses standard developer formulas to compute accurate results instantly.

FAQ

How do I use the HTTP Status Codes?
Open the page and fill in the input fields — results update automatically. 1xx-5xx lookup by category with meanings.
Are the results accurate?
Yes. Standard formulas and conversion factors are used and verified.
Is it free? Do I need to sign up?
Completely free. No registration, login or download required.
Does it work on mobile?
Yes. The responsive design works on phones, tablets and desktops.
Is my data saved?
No. Everything runs locally in your browser.

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Source & Updates

Based on RFC 4648, ECMA-262 and related specifications. Last updated: 2025-07

Authoritative sources:

Last updated:

Formulas and content on this page are reviewed by the YiJianSuan team. For reference only — official sources prevail.

Maintained and periodically reviewed by the YiJianSuan editorial team — review process in ourEditorial Policy.

Cite this page: YiJianSuan. HTTP Status Codes[EB/OL]. https://www.yijiansuan.com/en/c/dev/http-status

Results provided by this tool are for reference only and do not constitute professional advice.