When i use RHTTPTransaction/RHTTPSession to make a http get,it can not redirect automaticly.

HTTP Events as below:

EGotResponseHeaders
Here get StatusCode(302),and by enum headers i can get Location field correctly!
EGotResponseBodyData
EGotResponseBodyData
EResponseComplete
EFailed

and then http module stoped,it does not redirect automaticly.what's the problem?