[MapProxy] Multiple URLs mapped to same WSGI MP config

Oliver Tonnhofer olt at omniscale.de
Mon Mar 23 01:20:15 PDT 2015

Hi Just,

> On 19.03.2015, at 19:46, Just van den Broecke <just at justobjects.nl> wrote:
> I need to map different URLs to the same WSGI MapProxy app and yaml file in Apache. From http://www.mediacore.com/blog/hosting-multiple-wsgi-applications-with-apache I learned that this can be done
> with WSGIApplicationGroup %{GLOBAL}. Otherwise the first URL works ok, but any other URL will trigger an MP error:
> ../loader.py", line 1621, in load_configuration_file
> [:error] [pid 20840] ...    if 'base' in current_dict:
> [:error] [pid 20840] ... TypeError: argument of type 'NoneType' is not iterable
> But if I use WSGIApplicationGroup as follows, it works ok:
>    WSGIApplicationGroup
>    WSGIScriptAlias /guest /var/mapproxy/config.py
>    WSGIScriptAlias /user1 /var/mapproxy/config.py
>    WSGIScriptAlias /user2 /var/mapproxy/config.py
> config.py calls make_wsgi_app() always with the same .yaml file. I use not other WSGI-directives.
> The question is: is this a safe thing to do or are there concurrency issues that may pop up at high load? Is this scenario what MultiMapProxy is meant for?

I can’t remember any error reports for running multiple WSGIScriptAlias. But if they all use the same config, maybe you can just start one MapProxy and use some mod_rewrite-fu?


Oliver Tonnhofer  | Omniscale GmbH & Co KG  | http://omniscale.com
OpenStreetMap WMS and tile services         | http://maps.omniscale.com

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