Thanks Andre for the detailed explanations. Looks like I have it figured out:
From: André Warnier [aw@xxxxxxxxxx]
>>
>> 1. Client goes to http://dodo.foo.com:
>> A. server changes this to http://foo.com/bar
>> B. server returns content (which will be http://foo.com/bar/index.html)
>> C. client sees the content in browser
>> D. AND the client's browser shows the URL (in Location text field) as being http://dodo.foo.com (rather than http://foo.com/bar/index.html)
>>
>
> As someone else indicated previously, this is a standard feature of
> mod_proxy.
Yes. However, AFAICT the ProxyPass cannot be given conditions as with RewriteRule. So if I have
ServerName foo.com
ServerAlias dodo.foo.com
then the ProxyPass/Reverse will be applied to requests to either domains, which is not what I want (requests to foo.com should be processed as usual as there are other web apps served from there).
>> 2. Client clicks on a link that is on the page just received:
>> A. the href will be, say, http://foo.com/bar/someotherpage.html
>> B. server returns content
>> C. client sees the content in browser
>> D. AND the client's browser shows the URL (in Location text field) as being
>> http://dodo.foo.com/someotherpage.html (rather than
>> http://foo.com/bar/someotherpage.html)
>
> So I will rectify A above as follows :
>
> A. the href will be http://dodo.foo.com/someotherpage.html
You're right, the href is actually "/someotherpage.html" so it will be as you say.
> And that will work, because of the Proxy rules above (he will get the
> content of the file "http://foo.com/bar/someotherpage.html"; )
In order to apply the proxying just for dodo.foo.com only, I use a rewrite rule. Here is what I have so far, seems to work completely:
RewriteCond %{HTTP_HOST} ^dodo\.foo\.com$
RewriteRule ^/bar/(.*) /$1 [R,L]
RewriteCond %{HTTP_HOST} ^dodo\.foo\.com$
RewriteRule ^(.+) %{HTTP_HOST}$1 [C]
RewriteRule ^dodo\.foo\.com/(.*) http://foo.com/bar/$1 [P]
The [R,L] of first rule causes a redirect to client and the rule processing ends so client will just make a new request with the /bar/ stripped out, AND client browser will show the redirected URL. The [P] in second rule will cause proxying, but only for requests to dodo.foo.com, so client will NOT see that foo.com/bar is really the URL used. Time will tell if there are any corner cases that this doesn't cover. But boy, that rewrite module is powerful stuff!
Oliver
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