WEBVTT

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What passes between a browser and a website server?

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HTTP uses requests and responses to exchange website resources.

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Follow one exchange before looking at the whole page.
6 request-and-response basics.

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The browser makes a request
It asks for a resource identified by an address.
Browser client · Resource address · Outgoing request

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The method describes the job
An HTTP method indicates the operation being requested.
Requested operation · HTTP method · Relevant resource

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The server sends a response
The reply includes a status and can include content.
Response status · Response information · Optional content

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A page uses many resources
The browser may also request images, stylesheets and scripts.
Page document · Images and styles · Scripts and other files

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Requests can happen later
An interactive page may fetch more information after its initial load.
Initial page load · Later interaction · Additional request

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Inspect the specific exchange
A developer can examine the request and response when diagnosing a fault.
Resource address · Observed status · Relevant response

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Your checklist
The browser makes a request · The method describes the job · The server sends a response · A page uses many resources · Requests can happen later · Inspect the specific exchange

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Use the actual request evidence to investigate a loading problem.
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