Re: [EMAIL PROTECTED] Forward proxies and aliases
Tavian Barnes wrote: Just an idea from a guy who really knows next to nothing about proxies : If - a proxy configuration allows you to selectively forward some requests to a selection of sites, but not to a local file - but what you want to do is to redirect some URLs to a local file then can you not set up a local virtual host under some name, and forward ditto local requests to that local virtual host, whose pleasure it would be to serve the local stuff in question ? André The thing is, when the browser sends the request to the local virtual host, it's treating it like a proxy server. So, the local host would have to be able to recognise a proxy request for a certain page, and return a local file instead, which is the same thing I'm trying to do now. It's probably me in this case, but I believe one of us is not understanding this right. At the browser level, you are requesting items from www.google.com, and the browser is configured to use serverA as a http proxy, right ? Right. And what you want is that the proxy on serverA would get some stuff really from www.google.com, but some other stuff it should deliver from local files instead, still right ? Right. But that is something you cannot configure easily, because there is no way in the proxy to tell it to forward some requests to a http server, but serve some other ones from local files. Still right ? As far as I can tell. So, what I mean is that on the same host hosting serverA, (which you use as a http proxy), you also configure a separate serverB (virtual), which can deliver some local files (if a suitable request URL requests them). (or you set up serverB on a totally separate local host, whatever). The browser requests are all directed to www.google.com, but still all requests go through serverA, because it is the configured http proxy. And serverA, by virtue of its proxy functionality would normally forward these requests to www.google.com (or serve them from its cache of www.google.com items). Now in serverA, you set up some early URL filter which will rewrite (modify) all requests which you do not really want to go to www.google.com, and substitute the appropriate URL so that this item will be instead proxied to serverB instead of www.google.com. (In other words e.g., in all requests ending in .gif, you change to hostname to serverB). So for some requests, www.google.com delivers the content, while from some others it will be serverB. But all responses eventually go back through the serverA proxy, which delivers them to the browser. Actually, it would be fine to just rewrite the url to a location on my local web server. I scratched my head figuring out how to do this, until I noticed that my RewriteRule ^/ig wasn't matching, but .*ig.* was. I figured that the rewrite module must handle proxied urls differently, so I wrote a script to use as a RewriteMap that simply copied standard input to a file, and to standard output again. Reading the file, it turns out (is this documented somewhere?) that the url comes to the RewriteRule in the form of proxy:http://www.google.com/ig; which I can now rewrite to http://localhost/ig. So, problem solved. I believe the browser wouldn't know the difference, because for him all requests are to www.google.com (while using the proxy serverA), and that's where it thinks it gets the responses from. I don't think that the browser matches the responses back with its requests, to check inside if they really come from the same place. Because if it did, then the whole proxy mechanism wouldn't work in the first place. When behind a proxy, the browser sends request to the proxy in the form of GET http://www.google.com/ig, rather than sending GET /ig to www.google.com. It has no idea if the proxy server did some tricky things behind its back. Or maybe I'm totally wrong with this, but it seems at least plausible, no ? Your idea is more complicated than I needed, but I think it should work too. Thanks Andre, and everyone else; I've got it working. André - The official User-To-User support forum of the Apache HTTP Server Project. See URL:http://httpd.apache.org/userslist.html for more info. To unsubscribe, e-mail: [EMAIL PROTECTED] from the digest: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] -- Tavian Barnes - The official User-To-User support forum of the Apache HTTP Server Project. See URL:http://httpd.apache.org/userslist.html for more info. To unsubscribe, e-mail: [EMAIL PROTECTED] from the digest: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [EMAIL PROTECTED] Forward proxies and aliases
On Tue, Jul 8, 2008 at 2:03 PM, Nick Kew [EMAIL PROTECTED] wrote:
On Tue, 8 Jul 2008 13:48:54 -0600
Tavian Barnes [EMAIL PROTECTED] wrote:
But that's a reverse proxy, not a forward one. I'm attempting to use
an Apache server as a proxy for my web browser, that uses a local copy
of certain files from certain sites. As such, it has to be a forward
proxy, because I'm using it for arbitrary web sites.
That's not what you originally asked.
It's what I attempted to ask, by referring to forward proxies in the
subject line.
Anyway, three solutions, from the most sensible
to the least:
* Set up proxy exceptions in your browser preferences
I know of nothing that can direct particular web addresses to local
copies of files; all the tools I've seen can just selectively proxy
addresses.
* Use mod_cache for your local copies
My local copies are intended to differ from the copies on the web.
Can mod_cache or mod_file_cache really be set to use a particular
local version of a file, rather than automatically generating the
cache? I realise that I didn't clarify this earlier.
* Use mod_rewrite - probably a rewritemap.
Is there any reason I'd need to use a rewrite map? Reading through
the mod_rewrite documentation, I came up with this,
RewriteCond %{HTTP_HOST} ^www\.google\.com
RewriteRule ^/ig /ig [R]
which unfortunately doesn't work. What am I missing?
Unless of course your real purpose is to block crap like
animated images, in which case maybe the rewritemap makes
good sense (I use my ADSL router to do that).
--
Nick Kew
Application Development with Apache - the Apache Modules Book
http://www.apachetutor.org/
-
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--
Tavian Barnes
-
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[EMAIL PROTECTED] Forward proxies and aliases
Is it possible to only proxy part of a site, and use local files for the rest? I want most requests to be passed through the proxy, but some to be aliased to a local file. I tried Alias http://www.google.com/ig /home/httpd/html/ig and similar things, and nothing worked. Can this be done? -- Tavian Barnes - The official User-To-User support forum of the Apache HTTP Server Project. See URL:http://httpd.apache.org/userslist.html for more info. To unsubscribe, e-mail: [EMAIL PROTECTED] from the digest: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [EMAIL PROTECTED] Forward proxies and aliases
But that's a reverse proxy, not a forward one. I'm attempting to use an Apache server as a proxy for my web browser, that uses a local copy of certain files from certain sites. As such, it has to be a forward proxy, because I'm using it for arbitrary web sites. On Tue, Jul 8, 2008 at 1:13 PM, Wilda, Jet [EMAIL PROTECTED] wrote: You can do that for example by ProxyPass /ig ! ProxyPass / http://server:port/ ProxyPassReverse / http:// server:port/ This would cause Apache to look for /ig in the DocumentRoot. ~Jet -Original Message- From: Tavian Barnes [mailto:[EMAIL PROTECTED] Sent: Tuesday, July 08, 2008 2:23 PM To: users@httpd.apache.org Subject: [EMAIL PROTECTED] Forward proxies and aliases Is it possible to only proxy part of a site, and use local files for the rest? I want most requests to be passed through the proxy, but some to be aliased to a local file. I tried Alias http://www.google.com/ig /home/httpd/html/ig and similar things, and nothing worked. Can this be done? -- Tavian Barnes - The official User-To-User support forum of the Apache HTTP Server Project. See URL:http://httpd.apache.org/userslist.html for more info. To unsubscribe, e-mail: [EMAIL PROTECTED] from the digest: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] -- Learn more about Chase Paymentech Solutions,LLC payment processing services at www.chasepaymentech.com. THIS MESSAGE IS CONFIDENTIAL. This e-mail message and any attachments are proprietary and confidential information intended only for the use of the recipient(s) named above. If you are not the intended recipient, you may not print, distribute, or copy this message or any attachments. If you have received this communication in error, please notify the sender by return e-mail and delete this message and any attachments from your computer. - The official User-To-User support forum of the Apache HTTP Server Project. See URL:http://httpd.apache.org/userslist.html for more info. To unsubscribe, e-mail: [EMAIL PROTECTED] from the digest: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] -- Tavian Barnes - The official User-To-User support forum of the Apache HTTP Server Project. See URL:http://httpd.apache.org/userslist.html for more info. To unsubscribe, e-mail: [EMAIL PROTECTED] from the digest: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
