Check content-type header is present before trying to use it
Check content-type header is present before trying to use it

aoberoi/Opentok-PHP-SDK,jayendra03/OpenTok-PHP-SDK,aoberoi/Opentok-PHP-SDK,opentok/OpenTok-PHP-SDK,jayendra03/OpenTok-PHP-SDK,jayendra03/OpenTok-PHP-SDK,jayendra03/OpenTok-PHP-SDK,aoberoi/Opentok-PHP-SDK