java - Getting authentication token when calling a get url from google app engine -


i trying connect compute engine app app engine using app identity feature of google cloud.

i not sure need extract accesstoken can used authentication. getting invalid access token currently, below code using getting access token:

 url url = new url("http://104.197.5.2/myapp/route?tn=12402735");  arraylist < string > scopes = new arraylist < string > ();  scopes.add("http://104.197.5.2/myapp/route?tn=12402735");  appidentityservice appidentity = appidentityservicefactory.getappidentityservice();   appidentityservice.getaccesstokenresult accesstoken = appidentity.getaccesstoken(scopes);   httpurlconnection connection = (httpurlconnection) url.openconnection();  connection.setdooutput(true);  connection.setrequestmethod("get");  connection.addrequestproperty("content-type", "application/json");  connection.addrequestproperty("authorization", "bearer  " + accesstoken.getaccesstoken());   connection.setinstancefollowredirects(false);  bufferedreader in = new bufferedreader(new inputstreamreader(      connection.getinputstream()));  string inputline;  while ((inputline = in .readline()) != null)      resp.getwriter().println(inputline); in .close();

on server code ( hosted on compute engine), how should validate incoming token ie should compare

below excerpt of server log when call reaches it

2015-04-29 07:12:52+0000 [httpchannel,0,98.188.155.163]  {      'host':'104.197.53.229',    'content-type':'application/json',    'connection':'keep-alive',    'authorization':'bearer invalidtoken:http://104.197.5.2/myapp/route?tn=12402735:2123' }


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