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The protocol browsers and most web APIs use to send requests and receive responses.
HTTP is the request-response layer of the web. A browser sends an HTTP request like GET /lexique; the server returns an HTTP response with a status code, headers, and usually HTML or JSON. Most web debugging starts by checking what HTTP request was made and what response came back.
Plainly
Think of HTTP as roads and power for the app city. The protocol browsers and most web APIs use to send requests and receive responses.
In practice
Use it when local behavior needs to become a reachable, reliable deployed service. In practice, define the owner, input, output, and failure mode before you rely on it.