Google Reader API request token, get 400:Bad Request

this Android code worked fine before, but i'm having problems for some reason. here is the request i'm trying to make:

https://www.google.com/reader/api/0/token

i'm getting 400:Bad Request as a response, and i'm not sure why.开发者_如何转开发 isn't this the correct URL for requesting a token? the auth token is being passed as a header in all requests now, and i can request feed list, and it works just fine, so there's nothing wrong with the auth code. what gives?

in addition, i can request a token in a normal browser, like Chrome, and get a token as a response body. so the request itself is not the problem. i just can't figure out what is wrong with my requests in code...

the answer is to use http rather than https. if anyone else is having trouble getting tokens from the unofficial google reader api, check whether you are using secure http or not.