The documentations states registered operation classes are consulted to the reverse order in which they are registered. New registrations are added to the beginning of the array in the register implementation. Fixed using the reverseObjectEnumerator when iterating the array which produced the opposite of documented behaviour. fixes #794
changed op_class variable to more objective-c style variable name operationClass
Merge pull request #849 from joelparsons/master

AFHTTPClient Registered operation classes consulted in wrong order.