Written by Google, this library is a flexible, efficient, and powerful Java client library for accessing any resource on the web via HTTP. It features a pluggable HTTP transport abstraction that allows any low-level library to be used, such as java.net.HttpURLConnection, Apache HTTP Client, or URL Fetch on Google App Engine. It also features efficient JSON and XML data models for parsing and serialization of HTTP response and request content. The JSON and XML libraries are also fully pluggable, including support for Jackson and Android's GSON libraries for JSON.

Supports these Java environments:

• Java 5 (or higher) standard (SE) and enterprise (EE)
• Android 1.5 (or higher)
• Google App Engine

See also these related projects that are built on this library:

• Google OAuth Client Library for Java -- OAuth 1 and OAuth 2
• Google API Client Library for Java -- Google APIs

This is an open-source library, and contributions are welcome.