Re: Zope 2 WSGI investigation

On Mon, Jan 09, 2012 at 10:01:29AM +0100, Sylvain Viollon wrote:
> Op 8 jan 2012, om 16:36 heeft Laurence Rowe het volgende geschreven:
> > On 3 January 2012 08:34, Sylvain Viollon <[email protected]> wrote:
> >> Op 1 jan 2012, om 20:39 heeft Martin Aspeli het volgende geschreven:
> 
> [...]
> 
> >>> 
> >>> * Supports simplified virtual hosting with X-VHM-Host
> >> 
> >>  That is not completely true. I support setting the hostname,
> >>  however to set a virtual path, you need to do this during
> >>  traversing, which is done in BaseRequest, that I don't change
> >>  (because it is a big large blob of code where you cannot really
> >>  plug anything in it, or change only a few line in it without
> >>  changing everything).
> >> 
> >>  In production we use mod_rewrite to rewrite the URL with an old
> >>  VirtualHostMonster url and pass it to mod_wsgi with the help of
> >>  the flags PT.
> > 
> > What advantage is there to setting the X-VHM-Host header over just
> > setting the Host header?
> 
>    You can't set a virtual path with the Host header, it is not valid
>    if you want to follow the RFC.  After as well, you can include the
>    port in it, but I think you are not sure if you can't really know
>    if you should create https URL or not, you don't have this
>    information (this is not required only to be on port 443, and if it
>    is I am not even sure the port is correctly added in the Host
>    header).

In the WSGI world it's usual to use the X-Forwarded-Scheme header to
determine the scheme (http or https), AFAIU.

See e.g. http://pythonpaste.org/wsgiproxy/#the-proxy
http://pythonpaste.org/deploy/modules/config.html#paste.deploy.config.PrefixMiddleware
http://packages.python.org/Deliverance/proxy.html
http://docs.pylonsproject.org/projects/pyramid_cookbook/en/latest/deployment/nginx.html

>    I think it would be safer to have a separate header for all this
>    information, and not touching the Host headers, that applications
>    might expect to be correct.
> 
>    Regards,
> 
>    Sylvain,
> 
> http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.23
> http://www.ietf.org/rfc/rfc2818.txt

Marius Gedminas
-- 
http://pov.lt/ -- Zope 3/BlueBream consulting and development

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