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Description of problem:
With ProxyRemote configuration the HTTPS backend receives a request with an absoluteURI, which the backend couldn't handle and request will fails.There is upstream bugzilla https://bz.apache.org/bugzilla/show_bug.cgi?id=55892 which has been resloved and patch is available which fixed the issue. 

Version-Release number of selected component (if applicable):
httpd-2.2.15-54

Additional info:
Refer https://bz.apache.org/bugzilla/show_bug.cgi?id=55892

http://svn.apache.org/r1681289

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2017-0784.html