The HTTP specification states that all headers must be terminated with both a carriage-return (hex 0D) and a linefeed (hex 0A)
CR/LF pair), and that the last header in a stream must be followed by a blank line, and also terminated with a
CR/LF pair. So, the MIME header at the beginning of a CGI program usually has two
CR/LF pairs at the end of it.
The MIME header that is sent by the CGI program will actually be combined with a set of headers that the HTTP server will send to the client before sending the body of the data.