Sylvain Beaux wrote:
Hi all,
I'm trying to use squid in reverse-proxy mode with 2 back-end Web
servers (Web Srv 1 and Web Srv 2),
a remote user can request those servers with Squid public FQDNs:
internet lan
user <-------------------> squid <-------------------> Web Server 1
[squid1-pub-fqdn] [websrv1-priv-fqdn]
<-------------------> Web Server 2
[squid2-pub-fqdn] [websrv2-priv-fqdn]
I have installed and configured squid successfully to map the public
FQDN to the private FQDN.
But, after many unsuccessfull google searches, I would like to know if
it's possible to dynamically modify the HTML content of the HTTP response.
example 1:
1) the user sends a GET request to the Squid1 public FQDN :
HTTP 1.1 GET /
2) Squid forwards this request to the WebSrv1
Squid does this for reverse-proxies already.
3) the WEB Srv 1 sends a HTML page to Squid :
HTTP 1.1 200 OK
<html>
<body>
<a href=***WebSrv2-priv-fqdn***>
</body>
</html>
This is not a well-designed website. URL within a page should be
relative to the pages location or domain. A lot of dynamic systems are
coming to grief these days over hard-coding domain into URI systems
where they are not needed.
4) Squid parse the HTML data to modify
HTTP 1.1 200 OK
<html>
<body>
<a href=***WebSrv2-priv-fqdn***>
</body>
</html>
into
HTTP 1.1 200 OK
<html>
<body>
<a href=***Squid2-pub-fqdn***>
</body>
</html>
and forwards the modified page to the user.
This is not possible in Squid-2 without patching.
Squid-3 has ICAP and ESI (soon to be eCAP) for modifying content.
Although for simply changing the domain your pages should ideally only
reference '/path-in-site-to-file' etc.
example 2:
1) idem
2) idem
3) the WEB Srv 1 sends a HTTP redirection to the Web Srv 2:
HTTP 1.1 302 move Temporally
Location : ***WebSrv2-priv-fqdn***
4) Squid modify the location header
Location : ***WebSrv2-priv-fqdn*** into
Location : ***Squid2-pub-fqdn***
and forwards the modified redirection to the user.
I believe squid does this for properly configured accelerators.
Do you have all the reverse-proxy http_port options and cache_peer
config or just a redirector?
Is it a Squid possible feature ?
If not, is it possible to dev (Existant API ? ) a module that can parse
the http responses and dynamically modify theirs content ?
Lookup Squid-3 ICAP and upcoming eCAP.
Amos
--
Please use Squid 2.6.STABLE19 or 3.0.STABLE4
