rnewson commented on a change in pull request #605: Add Prefer: return=minimal 
support
URL: https://github.com/apache/couchdb/pull/605#discussion_r132118950
 
 

 ##########
 File path: src/chttpd/src/chttpd_prefer_header.erl
 ##########
 @@ -0,0 +1,54 @@
+% Licensed under the Apache License, Version 2.0 (the "License"); you may not
+% use this file except in compliance with the License. You may obtain a copy of
+% the License at
+%
+%   http://www.apache.org/licenses/LICENSE-2.0
+%
+% Unless required by applicable law or agreed to in writing, software
+% distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+% WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+% License for the specific language governing permissions and limitations under
+% the License.
+
+-module(chttpd_prefer_header).
+
+
+-export([
+    maybe_return_minimal/2
+]).
+
+
+-include_lib("couch/include/couch_db.hrl").
+
+
+maybe_return_minimal(#httpd{mochi_req = MochiReq}, Headers) ->
+    case get_prefer_header(MochiReq) of
+        "return=minimal" -> 
+            filter_headers(Headers, get_header_list());
+        _ -> 
+            Headers
+    end.
+
+
+get_prefer_header(Req) ->
+    case Req:get_header_value("Prefer") of
+        Value when is_list(Value) ->
+            string:to_lower(Value);
+        undefined -> 
+            undefined
+    end.
+
+
+filter_headers(Headers, IncludeList) ->
+    lists:filter(fun({HeaderName, _}) -> 
+        lists:member(HeaderName, IncludeList)
+    end, Headers).
+
+
+get_header_list() ->
+    SectionStr = config:get("chttpd", "prefer_minimal", []),
 
 Review comment:
   the default needs to be ""?
 
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