[MapProxy] IO Error

[Travis Kirstine]

I have mapproxy v1.5 set up using multiple TMS as source with each source
having a polygon shapefile as a coverage.  I then use a cache to assemble
the source TMS together with storage disabled.  I've noticed that when I
make a request for one of the caches outside of the defined boundary
MapProxy will generate an IO error:

Am I doing something wrong or is this related to the fix - "catch IOErrors
when PIL/Pillow can't identify image file"

Thanks

2014-04-28 13:00:43 [7465] [ERROR] Error handling request
Traceback (most recent call last):
  File "/usr/lib/python2.6/site-packages/gunicorn/workers/async.py", line
45, in handle
    self.handle_request(listener, req, client, addr)
  File "/usr/lib/python2.6/site-packages/gunicorn/workers/async.py", line
93, in handle_request
    respiter = self.wsgi(environ, resp.start_response)
  File "/usr/lib/python2.6/site-packages/mapproxy/wsgiapp.py", line 181, in
__call__
    return resp(environ, start_response)
  File "/usr/lib64/python2.6/contextlib.py", line 34, in __exit__
    self.gen.throw(type, value, traceback)
  File "/usr/lib/python2.6/site-packages/mapproxy/util/__init__.py", line
42, in local_base_config
    yield
  File "/usr/lib/python2.6/site-packages/mapproxy/wsgiapp.py", line 181, in
__call__
    return resp(environ, start_response)
  File "/usr/lib/python2.6/site-packages/mapproxy/response.py", line 151,
in __call__
    self.response.seek(0, 2) # to EOF
ValueError: I/O operation on closed file

#######################################################

caches:
  ORTHO2006:
    grids: [spherical_mercator]
    sources: [foo1_tms, foo2_tms]
    meta_buffer: 0
    meta_size: [1,1]
    format: image/png
    disable_storage: true

sources:
 foo1_tms:
    type: tile
    url: '
http://localhost/mapcache_fbstiles/tms/1.0.0/foo1@gmaps/%(tms_path)s.xxx'
    grid: spherical_mercator
    transparent: true
    on_error:
      other:
        response: transparent
        cache: false
      404:
        response: transparent
        cache: false
    coverage:
      datasource:
'/home/caches/src/boundaries/web_mercator/foo1_boundary_epsg3857.shp'
      srs: EPSG:3857

 foo2_tms:
    type: tile
    url: '
http://localhost/mapcache_fbstiles/tms/1.0.0/foo2@gmaps/%(tms_path)s.xxx'
    grid: spherical_mercator
    transparent: true
    on_error:
      other:
        response: transparent
        cache: false
      404:
        response: transparent
        cache: false
    coverage:
      datasource:
'/home/caches/src/boundaries/web_mercator/foo2_boundary_epsg3857.shp'
      srs: EPSG:3857
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