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HTTP Accept Header Generator

Generate HTTP Accept, Accept-Language, Accept-Encoding, and Content-Type headers for API requests, browser testing, JSON APIs, XML APIs, file downloads, and content negotiation debugging.

Request Profile

Header Values

Options

Content negotiation tells the server what response formats, languages, and encodings the client can accept.

Output

Generated Accept header output will appear here.

Building HTTP Accept Headers for API Testing

Accept headers help clients tell servers which response formats they prefer. For APIs, this often means JSON, XML, GraphQL JSON, file downloads, language preferences, and compression support.

This HTTP Accept Header Generator creates clean request headers and ready-to-copy examples for cURL, Fetch, Axios, JSON, and plain header formats.

Using the HTTP Accept Header Generator

  1. Choose a preset such as JSON API, browser HTML, XML API, GraphQL, or file download.
  2. Edit Accept, Content-Type, Accept-Language, or Accept-Encoding values if needed.
  3. Choose the request method and output format.
  4. Review warnings about wildcards or unnecessary headers.
  5. Copy the headers or generated request snippet.

Common Accept Header Examples

  • application/json for most JSON APIs.
  • text/html for browser-style HTML requests.
  • application/xml or text/xml for XML APIs.
  • application/octet-stream for binary downloads.
  • application/graphql-response+json for GraphQL responses.

Example Generated Headers

Accept: application/json
Content-Type: application/json; charset=utf-8
Accept-Language: en-US,en;q=0.9
Accept-Encoding: gzip, br

Accept and Content-Type Are Different

Accept describes what response formats the client can receive. Content-Type describes the format of the request body being sent. A GET request often needs Accept but may not need Content-Type because it usually has no body.

When debugging API issues, check both headers carefully. A wrong Accept value can trigger an unexpected response format, while a wrong Content-Type can make the server reject or misread the request body.

Frequently Asked Questions

What does an HTTP Accept Header Generator do?

It creates request headers that tell a server which response format, language, and encoding the client prefers.

What is the difference between Accept and Content-Type?

Accept describes the response format the client wants. Content-Type describes the request body format the client is sending.

Should GET requests include Content-Type?

Usually not unless the request has a body or an API specifically requires it.

What does q=0.9 mean in an Accept header?

It is a quality value that tells the server relative preference when multiple formats or languages are acceptable.

Is anything uploaded when I generate headers?

No. The generator runs directly in your browser.