[MapProxy] tile source error handling and WMS requests

[Travis Kirstine]

I have my config as follow in which my source TMS have a 404 error defined
(transparent / no cache).  The TMS sources each have a corresponding cache
defined with no caching.  A composite cache containing both TMS sources is
also defined.  If I make a WMS request to the composite layer and one of
the source TMS layers returns a 500 service unavailable MapProxy will still
generate a image.  Is there a way to return a error 404 or other from
MapProxy instead of the image.


sources:
   layer2_tms:
      type: tile
      url: 'http://localhost:88/mapcache/tms/1.0.0/t2@gmaps/%(tms_path)s.xxx
'
      grid: spherical_mercator
      transparent: true
      on_error:
         404:
            response: transparent
            cache: false
   layer1_tms:
      type: tile
      url: 'http://localhost:88/mapcache/tms/1.0.0/t1@gmaps/%(tms_path)s.xxx
'
      grid: spherical_mercator
      transparent: true
      on_error:
         404:
            response: transparent
            cache: false

caches:
   layer2_cache:
      grids: [spherical_mercator]
      sources: [layer2_tms]
      meta_buffer: 0
      meta_size: [1,1]
      disable_storage: true
   layer1_cache:
      grids: [spherical_mercator]
      sources: [layer1_tms]
      meta_buffer: 0
      meta_size: [1,1]
      disable_storage: true
   composite_cache:
      grids: [spherical_mercator]
      sources: [layer2_tms, layer2_tms]
      meta_buffer: 0
      meta_size: [1,1]
      format: mixed
      request_format: image/png
      cache:
         type: riak
         nodes:
           - host: riak.foobar.com
         bucket: composite

layers:
   - name: composite
     title: 'composite'
     sources: [composite_cache]





layers:
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