What, at the bare minimum, is required for an HTTP request?

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if the request is: "GET / HTTP/1.0\r\n\r\n" then the response contains header as well as body, and the connection closes after the response.

if the request is:"GET / HTTP/1.1\r\nHost: host:port\r\nConnection: close\r\n\r\n"
then the response contains header as well as body, and the connection closes after the response.

if the request is:"GET / HTTP/1.1\r\nHost: host:port\r\n\r\n" then the response contains header as well as body, and the connection will not close even after the response.

if your request is: "GET /\r\n\r\n" then the response contains no header and only body, and the connection closes after the response.

if your request is: "HEAD / HTTP/1.0\r\n\r\n" then the response contains only header and no body, and the connection closes after the response.

if the request is: "HEAD / HTTP/1.1\r\nHost: host:port\r\nConnection: close\r\n\r\n" then the response contains only header and no body, and the connection closes after the response.

if the request is: "HEAD / HTTP/1.1\r\nHost: host:port\r\n\r\n" then the response contains only header and no body, and the connection will not close after the response.

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