Function read_response 

pub fn read_response(
    r: impl Read + Send + 'static,
    req_method: Option<&str>,
    max_header_bytes: usize,
) -> Result<ParsedResponse, ParseError>

Parse an HTTP/1.1 response from r.

req_method is the method of the request that prompted this response — needed to decide body presence for HEAD and CONNECT.

Port of Go’s ReadResponse(r *bufio.Reader, req *Request) (*Response, error).