HttpClient 3.1 works well to do URL fetch service on my computer. But when I uploaded it to GAE. It doesn’t work since GAE only supports some classes, less than my computer at least. I was disappointed very much. But I find something to cheer me up. There are some clear, neat api that GAE supports to do the similar things, probably less functional, but enough for me now.

Here are very useful links on google.com:

http://code.google.com/appengine/docs/java/javadoc/index.html?com/google/appengine/api/urlfetch/package-summary.html

http://code.google.com/appengine/docs/java/urlfetch/overview.html

In addition, if you like to use HttpClient on GAE, probably the link below is a good link to take a look at. It seems that the author developed two classes to make it work.

http://esxx.blogspot.com/2009/06/using-apaches-httpclient-on-google-app.html