Greetings, i had the same problem.
The Solution was, not to user proxyName and proxyPort in the Tomcat server.xml file.
If these variables are set, the location generated with sendRedirect (...) uses the proxyName and proxyPort.
And now the apache doesn't rewrite this header because it seems to be correct.
But the tomcat doesn't know that there is a https connection between the client and the httpd and therefor uses HTTP.
Perhaps you need to define two connectors with proxyName and proxyPort with different ports. Haven't tried this.
Regards, Nils Eckert
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