varnish removing Transfer-Encoding: chunked header

[Matthew Boedicker]

I have a rails app which returns 200 with an empty body as a response to a
POST. It does not set a Content-Length header, but does set a
Transfer-Encoding chunked header.

Varnish is removing the Transfer-Encoding header so that the response has
neither chunked nor content-length. This invalid response is causing the
upstream load balancer to return bad gateway.

I am using varnish 4.0.2-1. VCL is nearly the default VCL.

Is this expected behavior or should I open a bug?
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