Upload servlet: how to redirect the user back to the portlet

Hi. From what I've read in this forum, Oracle Portal does not support "multipart/form-data" forms, so the way to upload a file is to use a standalone servlet. The problem is, how do I redirect the user back to the portlet? Should I pass the back URL as a parameter to this servlet? How do I construct it?
Since it's an standalone servlet, I can't use oracle.portal.provider.v2.url.UrlUtils to construct a "back link". I had thought of using the referer header, but since this isn't always guaranteed to be present (for example, I know you can disable it in Firefox, and I think SSL conections disable it, too), I guess that maybe sending the URL generated using UrlUtils.PAGE_LINK, UrlUtils.REQUEST_LINK or UrlUtils.REFRESH_LINK (I would have to test which one suits my needs), it could work. Do you think is this the best solution?
Thanks in advance

If you use a popup window for file upload, you don't have such a redirect problem.

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Upload servlet: how to redirect the user back to the portlet

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