Error 500: Premature end of script headers

Question

I get a \"Premature end of script headers: contactform.cgi\" error message when running the below script. What frustrates me is that I ran this as a .php on another server

Answer 1

I bumped into this problem using PHP-FPM and Apache after increasing Apache's default LimitRequestFieldSize and LimitRequestLine values.

The only reason I did this (apache says don't mess) is because Yii2 has some pjax problems with POST requests. As a workaround, I decided to increase these limits and use gigantic GET headers.

php-fpm barfed up the 500 error though.