UUUP Tools

Developer Tools

HTTP Status Code Lookup with Usage Notes

Look up HTTP status codes and keywords locally in your browser. Covers common 1xx–5xx codes with meaning and typical usage notes for API debugging.

Quick switch→MIME Type Lookup
HTTPStatus codes
Quick switch:MIME Type LookupHTTP Header ParserURL Parser

Favorite this tool

No favorite storage mode has been selected.

Quick actions

Back to Developer Tools Browse all tools

Copy this tool URL or open the system share sheet on a supported device.

Use cases

  • Explain status codes returned by an API
  • Choose an appropriate redirect code
  • Reconcile mismatched frontend/backend error semantics

How to use

  1. Enter a status code or keyword
  2. Read the description and common scenarios
  3. Compare with the actual API response

Example input and output

Search

404

Result

Not Found

FAQ

Which status codes are included?

Common standard codes across 1xx–5xx. Less common extension codes may not have detailed entries.

Are the notes normative?

They are a developer quick reference. Formal semantics still come from RFCs and your framework’s conventions.

Tools

Related tools

Continue with another translated tool for a nearby task.

MIME Type Lookup

MIME Type Lookup for Content-Type Mapping

Available

Look up file extensions and MIME Content-Type values locally in your browser. Covers common formats for server config, upload checks, and API debugging.

MIME Lookup
Open tool

HTTP Header Parser

HTTP Header Parser for Request and Response Headers

Available

Parse raw request or response header text into structured key/value pairs locally. Useful for API debugging, cache policy checks, and CORS header review.

HTTP Header Parser
Open tool

URL Parser

URL Parser and Query Parameter Splitter

Available

Parse a URL into protocol, host, port, path, query, and hash fields, and list each query parameter name and value. Useful for debugging API URLs and share links.

URL Parser Developer
Open tool