Note: When you use a SOCKS proxy or another lower-level tunnelling method, you can use a local DNS server. This would only be possible if you use a local proxy server that you control.

Your best bet would be to configure the proxy server to use the DNS resolver of your choice. My app uses AsyncHttpClient library for network operation.My problem is i need to specify the proxy with port in order to connect to remote server. You could change the URL from, say, to, but then the proxy server won't know which hostname to request, an importanta part of the modern web (HTTP/1.1 and later), which depends on a Host header always being present in a request, removing the restriction that all hostnames be served from different IP addresses. Firstly, there is no mechanism to specify that the proxy should try a particular IP address for a particular host. It isn't possible to do the DNS lookup locally, and send only the IP address to the proxy server. Therefore, it must be the proxy that does the DNS lookup. The proxy then does the request on your behalf.

You send the full URL (including hostname) of your request to the proxy.

The server you connect to is that of the proxy, not of the ultimate destination.

This isn't possible when you use an HTTP proxy because:

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