Please notice that CURLINFO_HEADER_OUT and CURLOPT_VERBOSE option does not work together:
"When CURLINFO_HEADER_OUT is set to TRUE than CURLOPT_VERBOSE does not work."(from https://bugs.php.net/bug.php?id=65348).
This took me an hour or two to figure it out.