WEBVTT

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How does a browser know which kind of file arrived?

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The response Content-Type identifies the media type the server says it is sending.

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Check the type in the actual response.
6 MIME-type basics.

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Read the type and subtype
A media type combines a general category with a specific subtype.
General type · Slash separator · Specific subtype

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Look at a real example
A response such as text/html identifies HTML content.
text/html · HTML content · Browser handling

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Inspect the response header
The server normally supplies the type in Content-Type.
Server response · Content-Type header · Actual value

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Keep file and type consistent
The browser needs a suitable type for the content it receives.
Actual content · Suitable type · Correct handling

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Check text parameters
A charset parameter can describe the encoding used for text.
Text response · Charset parameter · Matching encoding

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Test the receiving application
Check that the intended browser or application opens the resource correctly.
Intended application · Expected behaviour · Useful result

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Your checklist
Read the type and subtype · Look at a real example · Inspect the response header · Keep file and type consistent · Check text parameters · Test the receiving application

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Ask your developer to check the response type and the actual file together.
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