Re: Redirection not working with nethttpd

Am Dienstag, den 11.08.2009, 21:55 +0200 schrieb Paolo Donadeo:
> > If the Location header starts with "/", Nethttpd tries to do an
> > "internal" redirect--that is, to rewrite the request and process it
> > directly, instead of returning a 302 response to the client.
> 
> Ok, I see. And, as expected:
> 
> > I think you can fix it by giving a full URL in the Location header in this code:
> 
> this solves the problem. In any case, I remain dubious about the
> nature of this behavior: bug or feature? :-)

This is a feature :-) It exists for compatibility with CGI, where a
redirect to a URL starting with / has always been taken as internal
redirect by web servers. Also, if such a redirect was sent to the web
browser, this would be a violation of the HTTP protocol (although many
browsers seem to handle this case).

> I think "internal redirection" is a good feature and I don't think
> this is the way it is supposed to work.

Well, you are using the interface that is compatible with CGI, so you
get also certain CGI quirks.

> > The exception you see is raised in nethttpd_reactor.ml, apparently
> > because the response has already been partially written. Possibly if
> > you really want an internal redirect you aren't supposed to commit the
> > channel?
> 
> If I don't commit the channel another exception is raised:
> 
> [test server] [err] [127.0.0.1] [POST /post_url] Nethttpd: Missing
> response, replying 'Server Error'
> 
> I believe this is correct: this is exactly the same exception you get
> when you forget to commit the channel. The server tries to process the
> response and finds it empty, so the exception.
> 
> As a quick fix I'll send the full redirection path back to the client,
> but I still think i miss something.

I have no full answer yet - I need to dig further into the problem. It
could easily be that you discovered a bug. I'll try to check that soon.

Gerd
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