httpcaddyfile: Add shortcut for proxy hostport placeholder #4263
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I've noticed that it's a pretty common pattern to write a proxy like this, when needing to proxy over HTTPS:
I find it pretty hard to remember the exact placeholder to use for this, and I continually need to refer to the docs when I need it. I think a simple fix for this is to add another Caddyfile shortcut for this one to shorten it: