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How can I download the thumbnail from alfreso ?

Question asked by zengqingyi12 on Apr 14, 2010
I need to download pdf document 's thumbnail from external programmingly, when I tried to download the image from my code, I got a 401 error, which meaned I don't have the permission to download it.

I tried to use httpClient to authenticate it with username and password, but not work.

is there any other method that I can download the thumbnail from alfresco with my code ?

I need to download this thumbnail