http::basic_parser::on_response_impl

Called after receiving the status-line.

void
on_response_impl(
    int code,
    string_view reason,
    int version,
    error_code& ec);

This virtual function is invoked after receiving a status-line when parsing HTTP responses. It can only be called when isRequest == false.

Name	Description
`code`	The numeric status code.
`reason`	The reason-phrase. Note that this value is now obsolete, and only provided for historical or diagnostic purposes.
`version`	The HTTP-version. This will be 10 for HTTP/1.0, and 11 for HTTP/1.1.
`ec`	An output parameter which the function may set to indicate an error. The error will be clear before this function is invoked.

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