MOBILE-3269 core: Fix HEAD requests in iOS
MOBILE-3269 core: Fix HEAD requests in iOS

reskit/moodlemobile,reskit/moodlemobile,dpalou/moodlemobile2,moodlehq/moodlemobile2,moodlehq/moodlemobile2,moodlehq/moodlemobile2,reskit/moodlemobile,dpalou/moodlemobile2,FMCorz/moodlemobile2,reskit/moodlemobile,moodlehq/moodlemobile2,dpalou/moodlemobile2,reskit/moodlemobile,FMCorz/moodlemobile2,reskit/moodlemobile,moodlehq/moodlemobile2,moodlehq/moodlemobile2