This libraries is composed of several modules:
Google HTTP Client Library for Java (google-http-client) is designed to be compatible with all supported Java platforms, including Android.
Android extensions to the Google HTTP Client Library for Java (google-http-client-android) support
Java Google Android (only for SDK >= 2.1) applications. This module depends on google-http-client.
Apache extension to the Google HTTP Client Library for Java (google-http-client-apache-v2) that
contains an implementation of HttpTransport based on the Apache HTTP Client. This module depends
on google-http-client.
Google App Engine extensions to the Google HTTP Client Library for Java
(google-http-client-appengine) support Java Google App Engine applications. This module depends on
google-http-client.
GSON extension to the Google HTTP Client Library for Java (google-http-client-gson) that contains
an implementation of JsonFactory based on the GSON API. This module depends on google-http-client.
Jackson2 extension to the Google HTTP Client Library for Java (google-http-client-jackson2) that
contains an implementation of JsonFactory based on the Jackson2 API. This module depends on
google-http-client.
Protocol buffer extensions to the Google HTTP Client Library for Java
(google-http-client-protobuf) support protobuf data format. This module depends on google-http-client.
XML extensions to the Google HTTP Client Library for Java (google-http-client-xml) support the XML
data format. This module depends on google-http-client.