https://bz.apache.org/bugzilla/show_bug.cgi?id=57836

            Bug ID: 57836
           Summary: Empty REMOTE_USER is translated to ""
           Product: Tomcat Connectors
           Version: 1.2.40
          Hardware: PC
            Status: NEW
          Severity: normal
          Priority: P2
         Component: isapi
          Assignee: dev@tomcat.apache.org
          Reporter: stanc...@hotmail.com

When the isapi code pulls the REMOTE_USER header from request that lacks it, it
gets translated to "" which results in Tomcat creating an empty Principal
object.

Here is description of the issue:

http://marc.info/?l=tomcat-dev&m=142921251105905&w=2

Essentially

GET_SERVER_VARIABLE_VALUE("REMOTE_USER", s->remote_user);

macro setting s->remote_user to "" instead of NULL

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