An overview of HTTP - HTTP | MDN - MDN Web Docs
https://developer.mozilla.org/en-US/docs/Web/HTTP/Overview
Oct 9, 2010 · HTTP is a client-server protocol: requests are sent by one entity, the user-agent (or a proxy on behalf of it). Most of the time the user-agent is a Web browser, but it can be anything, for example, a robot that crawls the Web to populate and maintain a search engine index.
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