ios - Handling time out with NSMutableURLRequest -

i making post web service calls in parallel asynchronous, setting time interval of nsmutableurlrequest 180 seconds.

but didfailwitherror: delegate not getting triggered @ interval of 180 seconds, rather goes less 75 seconds or greater value 220 seconds , on, not once 180 seconds.

as far scanned through similar questions, there no solid solution this. @ places, see timeoutinterval not work post methods. want know whether issue true post methods , there way overcome @ least in ios8?

if using post , ios version bellow 6, have set value above 240 seconds. otherwise, timeout ignored. see this post , this question.