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HTTP Content Negotiation Selector
Select a supplied representation using supported Accept media-range preferences.
Accept header, Available representation media types JSON
http-content-negotiation-selector.json (complete report)
Browser only
Runs locally in your browser. Your files, pasted content and generated output are not uploaded. Reset clears this tool’s working data.
This tool needs JavaScript. If it does not load, refresh the page and try again.
How to use this tool
- Enter values using the examples, or choose a local file where requested. Follow the displayed supported input shapes and limits.
- Choose Calculate result and inspect the complete result.
- Download result to save the primary file. Where supplied, additional links save source files and the full JSON report. Reset restores examples and clears output.
Examples
Accept header: application/json;q=0.8, text/html;q=0.9
Available representation media types JSON: ["application/json","text/html"]
Limitations
- Select among1–100 concrete ASCII media-type offers using RFC9110 ranges/parameters and q with at most3 decimals. Most specific matching range determines q,including q=0 exclusions. Refuse equivalent duplicate ranges,duplicate offer parameters and accept extensions after q. Ties use quality,range specificity,parameter count,header order,then offer order. Header/offer values at most65536 ASCII characters and100 parameters. No network or language negotiation.
- Text fields are limited to100,000 UTF16 units each and400,000 combined UTF8 bytes; file fields have their own displayed limits. Combined output is at most4MiB. Processing stops after30 seconds; tool-specific bounds may be tighter.
- Generated source is a downloadable result and is not executed here. Inspection does not establish remote behavior, trust or standards certification.
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