Hi, Community, Currently we use `pass_host` to mark how to process the upstream request’s Host header.
It can be one of [`pass`, `node`, `rewrite`], the default option is `pass`. pass: Pass the client's host transparently to the upstream; node: Use the host configured in the node of upstream; rewrite: Use the value of the configuration upstream_host. Referring to nginx(proxy_pass), tyk and kong, we found that their default behavior is not to preserve the client's request Host, but to set the upstream request’s Host header to the hostname specified in the upstream(service) by default. issues: 1. `pass_host` is not easy to understand, I think we could use `preserve_host` or `preserve_host_header` instead. 2. We should also be the same behavior as nginx, tyk and kong, not preserve the client's request Host by default if the hostname has been specified in the upstream. What is your opinion? Thanks!
