Hi Norman,
Whatever URL the servlet is initiated with is used as the base URL for
all subsequent continuations. So, if you contact the servlet at URL
/a/b/c then it will append the continuation tokens to /a/b/c. Since
you have set the servlet-regexp to #rx"", you are free to contact it
with any URL you want. So you could set up your proxy to redirect to
"podcasting/user" rather than just "user".
If from within a servlet, you want to adjust the URL, you can just
copy the ids from the url produced by send/* and change the base.
Here's a little example:
#lang racket
(require rackunit
web-server/servlet/web
net/url)
(require/expose web-server/servlet/web (embed-ids))
(define (copy-ks old-u new-u)
(embed-ids (continuation-url? (string->url old-u)) (string->url new-u)))
(copy-ks (embed-ids (list 1 2 3) (string->url "http://localhost/user";))
"http://localhost/podcasting/user";)
I use the functions the web server really uses, but you could also
just use string manipulation.
If you are okay using undocumented things, you could also parameterize
the current-execution-context and give it a new HTTP request that
contains a different base URI.
Jay
2011/1/16 Norman Gray <nor...@astro.gla.ac.uk>:
>
> Greetings.
>
> What controls the continuation URL generated when using the Racket web server?
>
> I'm using send/formlet to present and process a form. The form is presented
> on a page called http://localhost:8000/user, and when it's submitted, it goes
> to a continuation page .../user;blah.
>
> That works fine on http://localhost:8000/user. But on the deployment
> machine, the server in question is behind a proxy, so that the actual public
> URL is http://example.edu/podcasting/user. In this case, the continuation
> URL generated is just http://example.edu/user;blah, which is of course wrong.
>
> Now, the server obviously doesn't know that it's sitting behind a proxy, so
> it needs to be told to generate the extra element in the URL path. But how?
>
> The server is started up with:
>
> (serve/servlet audiotag-dispatch
> #:servlet-path "podcasting/"
> #:servlet-regexp #rx""
> #:listen-ip #f ;listen on all interfaces (only
> loopback by default)
> #:port (port-number)
> #:launch-browser? #f
>
> #:servlet-path looks likely, here, but it doesn't seem to have the desired
> effect. None of the other configuration parameters look likely either, and
> the contents of collects/web-server is too clever for my frazzled brain. Can
> anyone advise?
>
> I apologise if the answer is RTFM, but I'm on a bit of a deadline, enough
> that it seems prudent to give in and ask quickly, rather than save my pride.
>
> Thanks for any pointers.
>
> Best wishes,
>
> Norman
>
>
> --
> Norman Gray : http://nxg.me.uk
> Dept Physics and Astronomy, University of Glasgow, UK
>
> _________________________________________________
> For list-related administrative tasks:
> http://lists.racket-lang.org/listinfo/users
>
--
Jay McCarthy <j...@cs.byu.edu>
Assistant Professor / Brigham Young University
http://faculty.cs.byu.edu/~jay
"The glory of God is Intelligence" - D&C 93
_________________________________________________
For list-related administrative tasks:
http://lists.racket-lang.org/listinfo/users
