13.6. Heading Off Errors
The output of your program is usually parsed through the Web server (unless you use the increasingly rare nph feature), which adds headers like a status line (unless you provide one yourself), a server identification line, and a date. The essential header for you to remember is Content-type: you must output this one.
(Weeell … the complete truth is more complicated, but of little use. You can output any number of lines that look like headers [any line containing a colon with at least one nonspace character on either side, based on experimentation], and these lines are faithfully passed on by the server as though they actually mean something. As long as you output a blank line before your content, it'll make it through; ...
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