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A recent Apache update unexpectedly fixed a problem where mod_rewrite did not properly escape URIs when following the proxy rule [P].
Some sites have worked around this problem by using the global RewriteMap "escaped", like so:
RewriteRule (.) http://cloud.9/${escaped:$1} [P]
Since the update, sites that use this RewriteMap will escape URIs twice, resulting in a malformed URI sent from the proxy to the final server. If you use the "escaped" RewriteMap through mod_rewrite, please check that your site works properly with proxy URLs containing special chars (such as a space or colon).
Proxy rewrite rules should be modified to work without the "escape" RewriteMap:
RewriteRule (.) http://cloud.9/$1 [P]
Regards,
Ben
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