HTTP Status Code Lookup
Look up any HTTP status code and what it actually means.
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MIME Type Lookup
Find the MIME type for any file extension, or the reverse.
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Questions
Why does the browser ignore my Content-Type?
Some browsers sniff content when the declared type looks wrong, which can turn an uploaded file into executable HTML. Send X-Content-Type-Options: nosniff to disable that, and always set a correct, explicit Content-Type.
Should text types include a charset?
Yes, always. text/html without a charset leaves the browser guessing, and a wrong guess produces mojibake or, historically, a UTF-7 based XSS vector. Send text/html; charset=utf-8 explicitly.
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Image to Base64
Convert an image to a Base64 data URI for inline embedding.
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User Agent Parser
Break a User-Agent string into browser, engine, OS and device.
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