WEBVTT

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How does a response describe the content it is sending?

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HTTP headers carry additional information with requests and responses.

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Read each header according to its specific purpose.
6 HTTP-header basics.

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Headers accompany messages
They pass additional information between the client and server.
Request information · Response information · Named fields

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Each header has a meaning
The field name identifies the kind of information supplied.
Header name · Header value · Defined purpose

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Content type describes format
Content-Type identifies the media type of the supplied content.
Document format · Media type · Content interpretation

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Caching uses header guidance
Cache-Control can communicate rules about storing and reusing a response.
Storage rules · Reuse conditions · Cache behaviour

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Requests have headers too
The browser can send information about what it accepts.
Client preferences · Accept header · Requested representation

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Inspect the real message
A developer can review the headers received for the specific resource.
Actual resource · Received fields · Expected configuration

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Your checklist
Headers accompany messages · Each header has a meaning · Content type describes format · Caching uses header guidance · Requests have headers too · Inspect the real message

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Check the actual response and the documented meaning of each header.
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