Fix illegal requirement

Signed-off-by: Manson Li <manson.li@matchstick.tv>
Fix SSDP crashed

Signed-off-by: Manson Li <manson.li@matchstick.tv>
Check content-type in launch request

Signed-off-by: Manson Li <manson.li@matchstick.tv>
Fix a crash bug in ffox platform

Signed-off-by: Manson Li <manson.li@matchstick.tv>