nickva commented on a change in pull request #1176: Implement pluggable 
authentication and session support for replicator

 File path: src/couch_replicator/src/couch_replicator_auth.erl
 @@ -0,0 +1,100 @@
+% 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
+% 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.
+    initialize/1,
+    update_headers/2,
+    handle_response/4,
+    cleanup/1
+-type headers() :: [{string(), string()}].
+-type code() :: non_neg_integer().
+    "couch_replicator_auth_session,couch_replicator_auth_basic").
+% Behavior API
+-callback initialize(#httpdb{}) -> {ok, #httpdb{}, term()} | ignore.
+-callback update_headers(term(), headers()) -> {headers(), term()}.
 Review comment:
   It was a practical decision by looking at some of authentications 
mechanisms. Most I could find seem to work with headers. OAuth2 adds the bearer 
token as a header. Session cookie is a header as well.
   Other things I could think of are the url itself, so it allows adding query 
params, and the body. I don't know if passing the body through it would be a 
good idea (thinking of large streaming attachments for example). And couldn't 
think of a practical use for updating the url.

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