matching channel against all IP addresses for the hostname; prefering

Resolv.getaddress, despite IPv4 preference (there is some inconsistency
with IPv6 addresses using TCPSocket.getaddress)

lib/httpx/channel.rb

@@ -1,5 +1,6 @@
 # frozen_string_literal: true
 
+require "resolv"
 require "forwardable"
 require "httpx/io"
 require "httpx/buffer"
@@ -68,13 +69,13 @@ module HTTPX
     end
 
     def match?(uri)
-      ip = begin
-             TCPSocket.getaddress(uri.host)
-           rescue StandardError
-             uri.host
-           end
+      ips = begin
+        Resolv.getaddresses(uri.host)
+      rescue StandardError
+        [uri.host]
+      end
 
-      ip == @io.ip &&
+      ips.include?(@io.ip) &&
         uri.port == @io.port &&
         uri.scheme == @io.scheme
     end

lib/httpx/io.rb

@@ -1,5 +1,6 @@
 # frozen_string_literal: true
 
+require "resolv"
 require "socket"
 require "openssl"
 require "ipaddr"
@@ -19,7 +20,7 @@ module HTTPX
       if @options.io
         @io = case @options.io
               when Hash
-                @ip = TCPSocket.getaddress(hostname)
+                @ip = Resolv.getaddress(@hostname)
                 @options.io[@ip] || @options.io["#{@ip}:#{@port}"]
               else
                 @ip = hostname
@@ -30,7 +31,7 @@ module HTTPX
           @state = :connected
         end
       else
-        @ip = TCPSocket.getaddress(hostname)
+        @ip = Resolv.getaddress(@hostname)
       end
       @io ||= build_socket
     end