Hey @mccutchen
Yeah, we don’t support http/1.1 trailers. They should work when making an http/2 request, though.
By default our proxy “downgrades” incoming http/2 requests to http/1.1 on their last hop (when making a request to machine).
If you enable h2_backed option the proxy will do an h2c request instead. Make sure your app supports h2c. In Go, you’ll need to use this package - h2c package - golang.org/x/net/http2/h2c - Go Packages