Commons Http Client is a HTTP agent implementation in java supporting
client-side authentication, HTTP state management and HTTP connection management.
This requires the libraries httpclient-4.1.2.jar, httpcore-4.1.2.jar,
httpmime-4.1.2.jar, httpclient-cache-4.1.2.jar, commons-codec.jar and
commons-logging-1.1.1.jar to be in classpath.
The following example shows how to set a Global custom user agent HTTP request header instead of per request.
This method is useful if you are making multiple calls through the same user agent.