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Developer / Debugging

HTTP Status Code Lookup

Look up HTTP status codes by number or keyword, inspect the response family, and get practical debugging context directly in your browser. Look up HTTP status codes by number or keyword, inspect the response family, and get practical debugging context without leaving the browser.

1

Matches

4xx

Family

Client Error

Category

404

Top result

Loaded 404 example

Quick notes

Search by status code like `404`, by family like `5xx`, or by words like `forbidden`, `timeout`, or `redirect`.

This is useful when reading API logs, browser devtools, proxy dashboards, or monitoring alerts.

The best fix usually depends on whether the problem is request-side, auth-side, routing-side, or infrastructure-side.

Fast family filtering helps when you want to compare only client errors or only server errors.

Status family filter

Primary match

Code: 404

Title: Not Found

Family: 4xx

Category: Client Error

Meaning: The requested resource could not be found.

Common use, note, and retry guidance

Missing routes, missing records

A 404 can come from routing, casing, rewritten paths, or a missing database record.

Retrying is only useful if the resource may appear later or propagation is still in progress.

Nearby and commonly compared codes

Nearby

Commonly compared

Summary line

404 Not Found - The requested resource could not be found.

JSON preview

[
  {
    "code": 404,
    "title": "Not Found",
    "category": "Client Error",
    "meaning": "The requested resource could not be found.",
    "commonUse": "Missing routes, missing records",
    "practicalNote": "A 404 can come from routing, casing, rewritten paths, or a missing database record.",
    "retryHint": "Retrying is only useful if the resource may appear later or propagation is still in progress."
  }
]

Retry guidance

Retrying is only useful if the resource may appear later or propagation is still in progress.

Family rule of thumb

`2xx`: request succeeded

`3xx`: follow or inspect redirect/caching behavior

`4xx`: request-side issue or denied access

`5xx`: server-side or upstream issue

Matched status codes

404 Not Found

The requested resource could not be found.

Client Error

Missing routes, missing records

A 404 can come from routing, casing, rewritten paths, or a missing database record.

Practical signals

Client error codes usually mean the request can be fixed by changing input, auth, permissions, or request format.

Why this gets reused

Status codes keep showing up in browser devtools, API logs, CDN dashboards, and incident alerts.

People usually remember the famous ones, but the edge cases are where lookup tools start earning their keep.

Practical debugging notes plus comparison shortcuts make this more useful than a bare reference table.

Strong first-use cases

Checking what an unfamiliar response code actually means during API debugging.

Comparing nearby codes like `401`, `403`, `404`, and `422` while designing an endpoint.

Deciding whether retry logic makes sense for a given failure class.