Set the runtime configuration variable CGI_AUTO_HEADER to "0" (off, false, no) if you want to suppress the output of the HTML header. This can be useful when you want to execute a CGI program and include its output into an existing flow of HTML text. For example, with server-side includes (SSI), you can instruct the Web server to execute a subprogram in the manner of CGI and incorporate its output right into the HTML document before sending it to the requesting client.