url rewriting fails with multipart/form-data

[delbd <de...@oma.be>]

Hello,

Using struts and tomcat to handle a file upload form, i noticed the following 
problem. If the browsers doesn't accept cookies or tomcat does not yet use 
cookies with the involved session (ie we are at first page so tomcat is still 
probing the browser), tomcat is unable to read the jsessionid from the url of 
the multipart/form-data encoded POST. Method request.getUserPrincipal() 
returns null. This does not happens if cookies are used (browser accept 
cookies and tomcat has finished probing the browser) or if the form is a non 
multipart one.

Does anyone knows how to, either
- Have tomcat be able to extract jsessionid from url when it is a multipart 
POST
- Have tomcat use exclusively cookies (no url rewriting)

This is a big problem here as it prevent us to send emails with links to 
fileupload struts form where authentification is required.

Thanks for help if any

-- 
David Delbecq
Royal Meteorological Institute of Belgium 

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