Export WebPart by URL of a site

For example:

http://avepoint-zino:9002/sites/t2/_vti_bin/exportwp.aspx?
pageurl=http%3A%2F%2Favepoint%2Dzino%3A9002%2Fsites%2Ft2%2FPages%2Faa%2Easpx&guidstring=576d11db-b8ea-4593-9094-fcd659e833c5

 

Pageurl: the page containing the webpart you wanna export.

guidstring: the GUID of the webpart which you can get it from source code of the page.aspx?contents=1