EVIDENCE FOR YOUR NEXT WEB DECISION

HTTP Content Negotiation Tester

Compare Accept headers with declared representations; explain selected or rejected formats.

Worked exampleBrowser processingUseful downloads

A clear result starts here

Add your input or try the worked example.

Using HTTP Content Negotiation Tester

Compare Accept headers with declared representations; explain selected or rejected formats.

Use Try example to explore http content negotiation tester, or enter your own accept header.
Set available mime types, one per line. Read the field notes for supported values.
Choose Review input and inspect the result, including any review flags or unsupported cases.
Use the relevant download buttons to keep your result. CSV and report JSON preserve the available findings; original files are not changed.

Example

Accept header: image/avif,image/webp;q=0.8,image/*;q=0.5,*/*;q=0.1
Available MIME types, one per line: image/png
image/webp
image/jpeg

Questions & answers

What does HTTP Content Negotiation Tester do?

Compare Accept headers with declared representations; explain selected or rejected formats.

What input does this tool support?

Accept header. Available MIME types, one per line

What should I check before using the result?

Models media-type Accept quality and wildcard precedence. It does not model charset/language negotiation or media parameters besides q. Ties use the supplied server offer order.

Can I keep or share the result?

Yes. Use the result-specific downloads, CSV where available and report JSON. Downloads can contain your supplied information, so review the content before sharing. Processing runs in this browser; public pages also include the site’s approved advertising and optional analytics.