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Consider making `ProxySelector.getDefault()` the default `ProxyConfig`
Because this is already the default when JDK's proxy is used.
By using ProxySelector.getDefault() by default, we can reduce user confusion.
One thing to note is DefaultProxySelector#select has some privileged/synchronized calls even for non-proxy calls, so we may need to consider whether there will be a performance hit.
Today I was trying to debug some outgoing calls by settings http.proxyHost and HTTP_HOST variables. I realized Armeria's clients doesn't comply by default. I think it would be a nice addition to support it by default so it makes devs lives easier.
I feel like performance hit can be omitted if there is no proxy configuration? If there is a proxy config, I expect users would have already updated their client settings.
It's been a while since I created this issue - looking at this issue again, I agree it's probably reasonable to make this the default behavior 👍