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Client-side ProcessingUpdated 2026-02-11Report issue

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HTTP Header Reference

Look up HTTP headers and their usage.

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About HTTP Header Reference

Look up HTTP headers and their usage. Look up HTTP headers, descriptions, and usage examples online for free. Search any header name like Content-Type or Authorization to see its purpose and syntax. Provides instant lookups against a curated, built-in reference database that requires no internet connection. Results are displayed in a clear, structured format for easy reading and copying. Everything runs client-side in your browser for maximum speed and privacy — no data is sent to any server, and no signup is required.

Related tools: HTTP Status Code Lookup, Security Headers Generator, CORS Headers Generator

How to Use HTTP Header Reference

  1. Enter the value you want to look up.
  2. The tool searches its database and returns results.
  3. Review the detailed information displayed below.

Frequently Asked Questions

What is HTTP Header Reference?
Look up HTTP headers, descriptions, and usage examples online for free. Search any header name like Content-Type or Authorization to see its purpose and syntax.
Where does the lookup data come from?
The reference data is sourced from authoritative and well-maintained databases, standards organizations, and official registries. Data is embedded directly in the tool for instant offline-capable lookups.
How current is the reference data?
The lookup data is updated regularly as part of the tool's release cycle. For data that changes infrequently (such as country codes or HTTP status codes), the embedded dataset is comprehensive and reliable.
Can I search by partial matches?
Yes, the lookup supports partial and fuzzy matching so you do not need to enter the exact value. Start typing and the tool will filter results in real time, making it easy to find what you need.
Is HTTP Header Reference free to use?
Yes, all lookups are completely free and unlimited. The reference data is built into the tool, so it works instantly without any account.
Is my data safe when using HTTP Header Reference?
Yes, lookups are performed against locally stored data in your browser. No queries or input data are sent to any external server.

Related Tools

HTTP Status Code Lookup
Look up HTTP status codes and their meanings.
Security Headers Generator
Generate essential HTTP security headers.
CORS Headers Generator
Generate Cross-Origin Resource Sharing headers.