added content type because some servers return text/html content type for video/sound
added content type because some servers return text/html content type for video/sound

trd-delarajon/Spika-IOS,trd-delarajon/Spika-IOS,trd-delarajon/Spika-IOS,cloverstudio/Spika-iOS,trd-delarajon/Spika-IOS,cloverstudio/Spika-iOS,cloverstudio/Spika-iOS