Handle 5XX status codes, and respect Retry-After HTTP header.
Handle 5XX status codes, and respect Retry-After HTTP header.

mixpanel/mixpanel-iphone,depop/mixpanel-iphone,mixpanel/mixpanel-iphone,carezone/mixpanel-iphone,carezone/mixpanel-iphone,mixpanel/mixpanel-iphone,mixpanel/mixpanel-iphone,depop/mixpanel-iphone,depop/mixpanel-iphone,mixpanel/mixpanel-iphone,depop/mixpanel-iphone