1120

======== BEGIN INBOUND STREAM ========
PUT /articles/123/ HTTP/1.1
Host: example.com
User-Agent: demo
If-Match: "MStLasWX9", W/"Q6ZSf89"
Content-Type: text/plain
Content-Length: 16

Hello world!

======== BEGIN OUTBOUND STREAM ========
HTTP/1.1 412 Precondition Failed
Date: Thu, 31 Dec 2015 18:26:56 GMT
Content-Type: text/plain
Content-Length: 30

The entity tags don't match.
