I read somwhere that goole just allowed only fetch. Does that mean it's impossible to integrate org.apache.http.client.HttpClient in google appe engine ?
If not, are there an alternative for using existing librairies using org.apache.http.client.HttpClient on google app engine ?
So the answer is not. You need to use google fetch library.
From Google App Engine wiki page on Google Code as archived by Wayback Machine: