Add this to /var/chroot-reverseproxy/conf/httpd.conf:
CacheEnable disk /
CacheRoot "/var/cache/mod_proxy"
CacheDirLevels 3
CacheDirLength 5
CacheIgnoreCacheControl On
CacheMaxFileSize 100000000
CacheIgnoreNoLastMod On
CacheMaxExpire 1209600
CacheIgnoreQueryString On
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