Content-Type Header Checker

Paste response headers and check Content-Type, charset and nosniff against the expected response kind.

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This checker is for debugging API responses, static assets and browser loading issues caused by the wrong Content-Type. Paste headers and choose what the response is supposed to be.

What it checks

The report extracts MIME type and charset, compares them with JSON, HTML, JavaScript, CSS or download expectations and highlights nosniff-related blocking risks.

Scope

The tool checks headers only. It does not inspect response bytes or confirm that the body is valid JSON, HTML, CSS or JavaScript.