Github user shukitchan commented on a diff in the pull request:
https://github.com/apache/trafficserver/pull/393#discussion_r53426210
--- Diff: doc/admin-guide/plugins/webp_transform.en.rst ---
@@ -0,0 +1,38 @@
+.. _webp_transform:
+
+WebpTransform Plugin
+****************
+
+.. Licensed to the Apache Software Foundation (ASF) under one
+ or more contributor license agreements. See the NOTICE file
+ distributed with this work for additional information
+ regarding copyright ownership. The ASF licenses this file
+ to you 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.
+
+This plugin converts jpeg and png images and transforms them into webp
format.
+All response with content-type 'image/jpeg' or 'image/png' will go through
the transform.
+Content-type is changed to 'image/webp' on successful transformation.
+
+Installation
+============
+
+Add the following line to :file:`plugin.config`::
+
+ webp_transform.so
+
+
+Note
+===================
+
+This plugin only supports jpeg and png and require libjpeg > 1.9 and
libpng > 1.6.16
--- End diff --
This should change now that we are using imagemagick?
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