Already forwarded by dispatcher - Access author through proxy with dispatcher author

Question

I am currently trying to get an author dispatcher connected to an AEM Author instance. So without further ado I configure server1 with an author, try to access it through a browser ... works great. Then I configure the Author dispatcher on server2 point it to server1 ... try accessing it in a browser ... works great my author dispatcher serves pages and caches them perfectly.

Ok here comes the meat of this problem, I now configure an author on server3 that lives behind a proxy and point the dispatcher on server2 to forward requests to server3. So essentially the dispatcher author on server2 would need to go through the proxy to get to the server3. The proxy is correctly configured to forward requests to server3, 100% about that. This is where my problem lives as it seems like the dispatcher is unable to do this. When I request a page on server3 I get the following log message:

[Wed May 11 20:50:42 2016] [D] [26730] Found farm author for server2
[Wed May 11 20:50:42 2016] [D] [26730] checking [/]
[Wed May 11 20:50:42 2016] [D] [26730] request URL has no extension: /
[Wed May 11 20:50:42 2016] [D] [26730] cache-action for [/]: NONE
[Wed May 11 20:50:42 2016] [D] [26730] Connected to backend rend01 (server3)
[Wed May 11 20:50:42 2016] [D] [26730] Adding request header: Host
[Wed May 11 20:50:42 2016] [D] [26730] Adding request header: Cache-Control
[Wed May 11 20:50:42 2016] [D] [26730] Adding request header: Accept
[Wed May 11 20:50:42 2016] [D] [26730] Adding request header: Upgrade-Insecure-Requests
[Wed May 11 20:50:42 2016] [D] [26730] Adding request header: User-Agent
[Wed May 11 20:50:42 2016] [D] [26730] Adding request header: Accept-Encoding
[Wed May 11 20:50:42 2016] [D] [26730] Adding request header: Accept-Language
[Wed May 11 20:50:42 2016] [D] [26730] Adding request header: Cookie
[Wed May 11 20:50:42 2016] [D] [26730] Adding request header: X-Forwarded-Proto
[Wed May 11 20:50:42 2016] [D] [26730] Adding request header: X-B3-TraceId
[Wed May 11 20:50:42 2016] [D] [26730] Adding request header: X-B3-SpanId
[Wed May 11 20:50:42 2016] [D] [26730] Adding request header: X-B3-ParentSpanId
[Wed May 11 20:50:42 2016] [D] [26730] Adding request header: X-B3-Flags
[Wed May 11 20:50:42 2016] [D] [26730] Adding request header: Via
[Wed May 11 20:50:42 2016] [D] [26730] Adding request header: X-Forwarded-For
[Wed May 11 20:50:42 2016] [D] [26730] Adding request header: Server-Agent
[Wed May 11 20:50:42 2016] [I] [26731] Already forwarded by dispatcher (server2), declined.
[Wed May 11 20:50:42 2016] [I] [26731] "GET /" - - 0ms
[Wed May 11 20:50:42 2016] [D] [26730] response.status = 404
[Wed May 11 20:50:42 2016] [D] [26730] response.headers[Date] = "Wed, 11 May 2016 20:50:42 GMT"
[Wed May 11 20:50:42 2016] [D] [26730] response.headers[Content-Type] = "text/html; charset=iso-8859-1"
[Wed May 11 20:50:42 2016] [D] [26730] response.headers[Content-Encoding] = "gzip"
[Wed May 11 20:50:42 2016] [D] [26730] response.headers[Content-Length] = "180"
[Wed May 11 20:50:42 2016] [I] [26730] "GET /" 404 180 5ms

I have no clue as to why I can not access my author instance with a dispatcher author through a proxy.

Any thoughts or suggestions are welcomed.

Thanks.

Answer 1

Have you configured your proxy headers?

"proxy-authorization" "proxy-connection"

see at https://docs.adobe.com/docs/en/dispatcher/disp-config.html :

/clientheaders
{
    "referer"
    "user-agent"
    "authorization"
    "from"
    "content-type"
    "content-length"
    "accept-charset"
    "accept-encoding"
    "accept-language"
    "accept"
    "host"
    "if-match"
    "if-none-match"
    "if-range"
    "if-unmodified-since"
    "max-forwards"
    "proxy-authorization"
    "proxy-connection"
    "range"
    "cookie"
    "cq-action"
    "cq-handle"
    "handle"
    "action"
    "cqstats"
    "PATH"
}