[BP 6.6.3] - XDCR REST returns 500 instead of 404 for invalid paths

neil.huang@NeilsMacbookPro:~/source/couchbase/goproj/src/github.com/couchbase/goxdcr/tools$ curl -v -s -X GET -u Administrator:wewewe http://127.0.0.1:13000/xdcefe

* Trying 127.0.0.1...

* TCP_NODELAY set

* Connected to 127.0.0.1 (127.0.0.1) port 13000 (#0)

* Server auth using Basic with user 'Administrator'

> GET /xdcefe HTTP/1.1

> Host: 127.0.0.1:13000

> Authorization: Basic QWRtaW5pc3RyYXRvcjp3ZXdld2U=

> User-Agent: curl/7.64.1

> Accept: */*

>

< HTTP/1.1 500 Internal Server Error

< Content-Type: text/plain; charset=utf-8

< X-Content-Type-Options: nosniff

< Date: Mon, 10 Aug 2020 23:35:05 GMT

< Content-Length: 40

<

Invalid path, /xdcefe, in http request.

* Connection #0 to host 127.0.0.1 left intact

* Closing connection 0