Handle q parameter name case insensitively

https://tools.ietf.org/html/rfc7231#section-5.3.1

Author: scop

mimeparse.py

@@ -72,8 +72,9 @@ def parse_media_range(range):
     necessary.
     """
     (type, subtype, params) = parse_mime_type(range)
+    params.setdefault('q', params.pop('Q', None))  # q is case insensitive
     try:
-        if not params.get('q') or not 0 <= float(params['q']) <= 1:
+        if not params['q'] or not 0 <= float(params['q']) <= 1:
             params['q'] = '1'
     except ValueError:  # from float()
         params['q'] = '1'

testdata.json

@@ -9,6 +9,7 @@
     ["application/xml ; q=2;b=other",["application", "xml", {"q": "1", "b":"other"}]],
     ["application/xml ; q=0",["application", "xml", {"q": "0"}]],
     ["application/xml ; q=foo", ["application", "xml", {"q": "1"}]],
+    ["application/xml ; Q=0.6", ["application", "xml", {"q": "0.6"}]],
     [" *; q=.2",["*", "*", {"q": ".2"}]]
 ],