proxy: Turn on KeepAlive in QuicConfig of RoundTripper (#1943)
proxy: Turn on KeepAlive in QuicConfig of RoundTripper (#1943)

* Turn on KeepAlive in QuicConfig of RoundTripper

* Update reverseproxy.go

yukimochi/caddy,joshix/caddy,joshix/caddy,joshix/caddy,yukimochi/caddy,yukimochi/caddy