The first thing I always check when CLI works but web doesn't, is that I have my Content-Type line correct.
You need two newlines after it:
print "Content-Type: text/html\n\n";
At least about 60% of the time for me, that fixes my main issue of not seeing anything, or rendering the page as text rather than html.
Definitely check out marto
's links, those are nice tutorials.
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