HI,

I have a separate web server running Java servlets that I want to be able to 
make authenticated request to my GAE app, using regular Google acount 
authentication.

My problem is that I need  this web server to retrieve the auth token that 
allows to login to GAE and have subsequent requests authentified.
There's no problem doing that if the user enters is Google account l/p on 
the separate web server using a form. For example like documented here:
using the ClientLogin API: 
http://krasserm.blogspot.com/2010/01/accessing-security-enabled-google-app.html

However I want to avoid having doing that and instead have the user grant 
access to his Google account using the standard Google page (the one that is 
displayed with UserServiceFactory.getUserService().createLoginURL() on GAE). 
In short I'd like to have the same functionality that the createLoginURL() 
GAE API but triggered from my separate web server, to get the required auth 
token necessary for the server to do requests to the GAE app.
>From what I tried, this doesnt seem possible. The Google page whose URL is 
returned by createLoginURL() works only if the request comes from a GAE app.

So my question is if it is possible for an external web server to redirect a 
user to a page for granting access this web server to make authentified 
request to GAE? Or will I have to directly ask the user for is Google 
account credentials ? Does OAuth allow such functionality ?

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