From: Shing Wai Chan <shing.wai.chan_at_oracle.com>
Date: Tue, 17 Jan 2017 13:50:29 -0800

In PushBuilder, we have
        public abstract PushBuilder etag(String etag);
        public abstract String getEtag();

In http2 rfc, we have ETag.
I suggest to change the above API as follows:
        public abstract PushBuilder eTag(String eTag);
        public abstract String getETag();

Please let me know if you have any comment.
Shing Wai Chan