pyFF does not return SAML metadata when the entityID in the MDQ query ends with '.xml' and the request includes the header

Accept: application/samlmetadata+xml

The draft MDQ spec can be found at

https://github.com/iay/md-query/blob/master/draft-young-md-query-saml.txt

Code Version

Commit 7705880

Expected Behavior

pyFF should return SAML metadata (XML) in response to an MDQ query for entityIDs that end in ".xml" when the request includes the header

Accept: application/samlmetadata+xml

Current Behavior

When the entityID ends in '.xml' no SAML metadata is returned for the entity with that entityID even when the header is

Accept: application/samlmetadata+xml

Steps to Reproduce

Prepare a pyFF that parses the metadata aggregate at

http://mds.swamid.se/md/swamid-2.0.xml

and then try

curl \
-H 'Accept: application/samlmetadata+xml' \
http://localhost/entities/https%3A%2F%2Flogin.idp.eduid.se%2Fidp.xml