Need proxy_pass function to set custom upstream

[1a57danc3]

In order to protect unsecure upstream proxy.

[Leask]

Could you please tell me more about "unsecure upstream proxy"?

[1a57danc3]

For example:
A standard http proxy as upstream.

[Leask]

Got it. In fact, I support this feature in the foundation. I will consider how to expose this feature as a CLI-arg.