Empty response with proxy gzip response

[malud]

If the upstream backend answers with a gzip body the reverseproxy component throws a panic panic: net/http: abort Handler which is related to an error during body copy (client went away or writer closed).

1. Empty response because the server crashed.
2. Seems to be a bug in combination with our response writer wrapper und a gzip writer (close call?)

Couper Version: 0.6

Configuration:

server "zipzip" {
  endpoint "/**" {
    proxy {
      backend {
        path = "/en/"
        set_request_headers = {
          Accept-Encoding: "gzip"
        }
        origin = "https://wao.io/"
      }
    }
  }
}

[malud]

So in this case the upstream server did not send the gzip footer which results in a panic during body copy.

The missing recover() for our roundtrip routines leads to an exit.