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In PHP, the documentation says that you can replace previously set headers via the second, boolean, argument to header().
I’m wondering: Are HTTP headers case-sensitive or normalized in any way?
If I use:
header('Content-Type: text/plain');
header('Content-type: text/html');
… will it send one, or two different headers?
Similarly, if I use:
header('Content-Type: text/plain');
header('Content-type: text/html', TRUE);
… will that (properly?) replace the first?
According to the RFC 2616, HTTP header field names are case-insensitive.
PHP does get this right, and replaces the first header with the second.