Revert "reverse_proxy: Add 'transparent' Caddyfile subdirective (closes

#2873)"

This reverts commit 86b785e.

modules/caddyhttp/reverseproxy/caddyfile.go

@@ -411,21 +411,6 @@ func (h *Handler) UnmarshalCaddyfile(d *caddyfile.Dispenser) error {
 				}
 				h.TransportRaw = caddyconfig.JSONModuleObject(rt, "protocol", name, nil)
 
-			case "transparent":
-				if d.NextArg() {
-					return d.ArgErr()
-				}
-				if h.Headers == nil {
-					h.Headers = new(headers.Handler)
-				}
-				if h.Headers.Request == nil {
-					h.Headers.Request = new(headers.HeaderOps)
-				}
-				// The X-Forwarded-For header is always appended to by default, directly in the reverse proxy code
-				headers.CaddyfileHeaderOp(h.Headers.Request, "Host", "{http.request.hostport}", "")
-				headers.CaddyfileHeaderOp(h.Headers.Request, "X-Real-Ip", "{http.request.remote}", "")
-				headers.CaddyfileHeaderOp(h.Headers.Request, "X-Forwarded-Proto", "{http.request.scheme}", "")
-
 			default:
 				return d.Errf("unrecognized subdirective %s", d.Val())
 			}