Github user eiri commented on a diff in the pull request:
https://github.com/apache/couchdb-chttpd/pull/101#discussion_r53011410
--- Diff: src/chttpd_cors.erl ---
@@ -360,7 +399,7 @@ get_origin(Req) ->
undefined ->
undefined;
Origin ->
- ?l2b(to_lower(Origin))
+ ?l2b(Origin)
--- End diff --
Actually CORS specs
[point](https://www.w3.org/TR/cors/#origin-request-header) to "The Web Origin
Concept" RFC and hence require host to be ["converted to lowercase using the
ascii-casemap collation"](https://tools.ietf.org/html/rfc6454#section-4)
(subsection 5). So I guess we still need to_lower here
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