Mailing List Archive: working with a reverse proxy

working with a reverse proxy

Feb 27, 2024, 12:47 PM

Post #1 of 7 (373 views)

I am having a more or less default setup where I proxy a website with something like this

ProxyPass "https://${proxyhost}/en_gb"
ProxyPassReverse "https://${proxyhost}/en_gb"

ProxyPassReverseCookieDomain "${proxyhost}" "${defaulthost}"

ProxyHTMLURLMap ...
ProxyHTMLURLMap ..

Everything on the default host seems to work quite well and you can navigate all pages that are proxied.

The issue that I have is that the proxied website at some point does an api request to an external host, sending it's hostname. I want it to send the hostname of the defaulthost, not the proxyhost.

What would a best practice of 'informing' the proxyhost about that it is being proxied and it should send the defaulthost hostname?

Should I for instance set headers, and in the proxied website should I check on such headers? (Btw this is php). Or are there other things available like HTTP_X_FORWARDED_FOR

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Re: working with a reverse proxy [ In reply to ]

covener at gmail

Feb 27, 2024, 1:02 PM

Post #2 of 7 (373 views)

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> What would a best practice of 'informing' the proxyhost about that it is being proxied and it should send the defaulthost hostname?

can try https://httpd.apache.org/docs/2.4/mod/mod_proxy.html#proxypreservehost

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RE: working with a reverse proxy [ In reply to ]

Marc at f1-outsourcing

Feb 27, 2024, 2:09 PM

Post #3 of 7 (373 views)

Permalink

>
> > What would a best practice of 'informing' the proxyhost about that it is
> being proxied and it should send the defaulthost hostname?
>
> can try
> https://httpd.apache.org/docs/2.4/mod/mod_proxy.html#proxypreservehost

Proxy only works when I am having ProxyPreserveHost Off, I can't change that.

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Re: working with a reverse proxy [ In reply to ]

thumbs at apache

Feb 27, 2024, 2:50 PM

Post #4 of 7 (371 views)

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On Tue, Feb 27, 2024 at 5:10?PM Marc <Marc@f1-outsourcing.eu> wrote:

>
> >
> > > What would a best practice of 'informing' the proxyhost about that it
> is
> > being proxied and it should send the defaulthost hostname?
> >
> > can try
> > https://httpd.apache.org/docs/2.4/mod/mod_proxy.html#proxypreservehost
>
> Proxy only works when I am having ProxyPreserveHost Off, I can't change
> that.
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@httpd.apache.org
> For additional commands, e-mail: users-help@httpd.apache.org

What happens when you use ProxyPreserveHost, exactly?

RE: working with a reverse proxy [ In reply to ]

Marc at f1-outsourcing

Feb 28, 2024, 1:25 AM

Post #5 of 7 (369 views)

Permalink

>
>
> >
> > > What would a best practice of 'informing' the proxyhost about that
> it is
> > being proxied and it should send the defaulthost hostname?
> >
> > can try
> >
> https://httpd.apache.org/docs/2.4/mod/mod_proxy.html#proxypreservehost
>
> Proxy only works when I am having ProxyPreserveHost Off, I can't
> change that.
>
>
> What happens when you use ProxyPreserveHost, exactly?

I am getting a 'Content Encoding Error'. I think this proxied web application by default is doing some routing based on host names.
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Re: working with a reverse proxy [ In reply to ]

ylavic.dev at gmail

Feb 28, 2024, 3:52 AM

Post #6 of 7 (367 views)

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On Tue, Feb 27, 2024 at 9:49?PM Marc <Marc@f1-outsourcing.eu> wrote:
>
> Should I for instance set headers, and in the proxied website should I check on such headers? (Btw this is php). Or are there other things available like HTTP_X_FORWARDED_FOR

mod_proxy should add the "X-Forwarded-Host" header (i.e.
HTTP_X_FORWARDED_HOST in cgi/php) with the value of defaulthost, when
forwarding the request to proxyhost. This is the default behaviour,
unless "ProxyAddHeaders off".

Regards;
Yann.

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RE: working with a reverse proxy [ In reply to ]

Marc at f1-outsourcing

Feb 28, 2024, 6:22 AM

Post #7 of 7 (363 views)

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> > Should I for instance set headers, and in the proxied website should I
> check on such headers? (Btw this is php). Or are there other things
> available like HTTP_X_FORWARDED_FOR
>
> mod_proxy should add the "X-Forwarded-Host" header (i.e.
> HTTP_X_FORWARDED_HOST in cgi/php) with the value of defaulthost, when
> forwarding the request to proxyhost. This is the default behaviour,
> unless "ProxyAddHeaders off".
>

Thanks Yann! I was looking indeed at the wrong headers, these two are having the correct value.

[HTTP_X_FORWARDED_SERVER]
[HTTP_X_FORWARDED_HOST]

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