HttpClient 3.x requires
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* JRE 1.2.2 or above
* JSSE 1.0.3 when running in JRE < 1.4 (optional)
* JCE 1.2.2 when running in JRE < 1.4 (optional)
* Commons Logging 1.0.0 or above 
* Commons Codec 1.2.0 or above
* junit (unit testing only)

For building httpclient:
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Create the lib directory if necessary, and add the following to the lib directory:
* commons-codec.jar
* commons-logging.jar

For testing httpclient:
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Create the lib directory if necessary, and add the following to the lib directory:
* junit.jar