Proxy question - rewrite URLs

I’m brand new to nginx so apologies in advance if this is the incorrect
place to ask but I’ve been struggling with this for a week without much
headway. I’m trying to reverse proxy two hosts behind nginx. The twist
is
that one of the hosts provides resources that come from another host
that’s
not accessible by the client:

There are three servers in question:

  1. ico-proxy
  2. webhost1
  3. webhost2

webhost1 has login pages at [https]//webhost1/ and
[https]//webhost1:8443.
These are not visible outside the secure environment. ico-proxy sits on
the
publicly accessible network and can access webhost1 and webhost2 over
ports
443 and 8443.

I can successfully redirect the following using 301 returns:

[http]//ico-proxy/webhost1 -> [https]//ico-proxy

[http]//ico-proxy/webhost2 -> [https]//ico-proxy:8443
e.g.,

location /webhost1/ {
return 301 [https]//$host$request_uri;
}
I then do another redirect inside the 8443 listener:

server {
listen 8443;
servername webhost1;
location / {
proxy_pass [https]//webhost1:8443;
}
}

The above works so far. The problem occurs because there are some links
that
refer to webhost2 directly. I can fix some of these with
proxy_set_header
statements. However, webhost1 has multiple links to a page on webhost2.

Is there a way to reverse proxy to webhost1 and somehow intercept all
webhost2 requests and in turn proxy them through another port on
ico-proxy?

This is for an IBM Cloud Orchestrator (OpenStack based) installation.
IBM
doesn’t have any guidance for this setup. Unfortunately, I can’t modify
the
links from webhost2 as it’s a canned app.

Thanks in advance for any guidance on the best way to approach this.
I’ve
thought about adding DNS entries for webhost2 that point to ico-host but
this breaks other functionality.

KLL

Posted at Nginx Forum:
http://forum.nginx.org/read.php?2,258400,258400#msg-258400

On Mon, Apr 27, 2015 at 11:05:53AM -0400, DigitalHermit wrote:

Hi there,

I can successfully redirect the following using 301 returns:

location /webhost1/ {
return 301 [https]//$host$request_uri;
}

I’m not sure that does what you indicated that you want it to do; but
you also say that it works fine, so I’ll believe that part.

I then do another redirect inside the 8443 listener:

Note: there is no redirect here.

And your webhost1 and webhost2 seem to have become confused, unless I’m
missing something.

The above works so far. The problem occurs because there are some links that
refer to webhost2 directly. I can fix some of these with proxy_set_header
statements. However, webhost1 has multiple links to a page on webhost2.

What do you mean when you say “links”?

HTTP response headers, or HTTP response body content?

nginx can relatively easily modify response headers. nginx can less
easily
modify response body content.

Is there a way to reverse proxy to webhost1 and somehow intercept all
webhost2 requests and in turn proxy them through another port on ico-proxy?

Can you describe what you want, in terms of one request / one response
at a time?

I think it is:

client requests https://ico-proxy/webhost1/file
nginx responds with the content from https://webhost1/webhost1/file

That content includes in its body a html link to https://webhost2/file.
So:

client requests https://webhost2/file, but fails to get any response
because it can’t access webhost2.

What part of that have I got wrong?

(Please be specific. Ports and urls and webhost1 and webhost2 do matter
here.)

You probably will need to get nginx to reverse-proxy content on
webhost2. It’s not immediately clear to me whether you are better off
making the client believe that ico-proxy is webhost2; or trying to
edit the html link in the content returned from webhost1.

Good luck with it,

f

Francis D. [email protected]

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