get red of unwanted vary headers

src/c3nav/mapdata/middleware.py

@@ -0,0 +1,40 @@
+import re
+from functools import wraps
+
+
+class NoLanguageMiddleware:
+    def __init__(self, get_response):
+        self.get_response = get_response
+
+    def __call__(self, request):
+        response = self.get_response(request)
+
+        if not getattr(response, 'no_language', False):
+            return response
+
+        if not getattr(response, 'keep_content_language', False):
+            del response['Content-Language']
+
+        if not response.has_header('Vary'):
+            return response
+
+        vary = tuple(s for s in re.split(r'\s*,\s*', response['Vary']) if s.lower() != 'accept-language')
+
+        if vary:
+            response['Vary'] = ', '.join(vary)
+        else:
+            del response['Vary']
+
+        return response
+
+
+def no_language(keep_content_language=False):
+    def decorator(func):
+        @wraps(func)
+        def wrapper(*args, **kwargs):
+            response = func(*args, **kwargs)
+            response.no_language = True
+            response.keep_content_language = keep_content_language
+            return response
+        return wrapper
+    return decorator

src/c3nav/mapdata/views.py

@@ -10,11 +10,13 @@ from django.shortcuts import get_object_or_404
 from shapely.geometry import box
 
 from c3nav.mapdata.cache import MapHistory
+from c3nav.mapdata.middleware import no_language
 from c3nav.mapdata.models import Level, MapUpdate, Source
 from c3nav.mapdata.render.base import get_render_level_ids
 from c3nav.mapdata.render.svg import SVGRenderer
 
 
+@no_language()
 def tile(request, level, zoom, x, y, format):
     zoom = int(zoom)
     if not (0 <= zoom <= 10):