That should be easy. You can leverage the existing virtual server named "server", and add the following alternate docroot to it, as follows:
asadmin set [...] server.http-service.virtual-server.server.property.alternatedocroot_1="from=/user_document/* dir=/"
This is on Solaris and assumes the presence of a directory "/user_document/" containing the file "test.pdf", to follow your example.
On Windows, the following should do:
asadmin set [...] server.http-service.virtual-server.server.property.alternatedocroot_1="from=/user_document/* dir=c:\"
Notice that after executing the above command, no server restart is necessary.
Jan
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