mod rewrite - Using Apache HTTPD to proxy requests and when in error set status 200 and the error document -

i'm using apache httpd 2.4.12 proxy request remote server. if remote host returns error code such 502 need handle , return custom error page status of 200. workaround application issue doesn't handle non-200 errors , needs particular payload.

i can return custom error page status 502 (without rewriterule) or standard ok page status set 200. here's part of httpd.conf replicates latter:

<location /dm>    proxypass http://url.of/dm/    proxypassreverse http://url.of/dm/    errordocument 502 /error/error.html </location>  rewriteengine on rewritecond %{request_uri} /error/error.html     rewriterule ^(.*)$ /error/error.html [r=200,l] 

or there better alternatives apache httpd this? i'd use apache if possible because it's installed on system.

i had mod_lua installed on our apache instance fixed setting in httpd.conf:

<files *.lua>     sethandler lua-script </files>  <location /dm>    proxypass http://url.of/dm/    proxypassreverse http://url.of/dm/    errordocument 502 /error/error.lua  </location> 

then created script /error/error.lua:

function handle(r)     r.content_type = "text/html" -- set output text/html     r:puts("my custom error payload")     r.status = 200     return apache2.ok end