diff --git a/lib/browsermob/proxy/client.rb b/lib/browsermob/proxy/client.rb
index 160880a..eb7b5a4 100644
--- a/lib/browsermob/proxy/client.rb
+++ b/lib/browsermob/proxy/client.rb
@@ -4,7 +4,7 @@ module Proxy
     class Client
       attr_reader :host, :port
 
-      def self.from(server_url, port = nil)
+      def self.from(server_url, port = nil, args={})
         # ActiveSupport may define Object#load, so we can't use MultiJson.respond_to? here.
         sm = MultiJson.singleton_methods.map { |e| e.to_sym }
         decode_method = sm.include?(:load) ? :load : :decode
@@ -13,7 +13,7 @@ def self.from(server_url, port = nil)
         new_proxy_url.query = "port=#{port}" if port
 
         port = MultiJson.send(decode_method,
-          RestClient.post(new_proxy_url.to_s, '')
+          RestClient.post(new_proxy_url.to_s, args)
         ).fetch('port')
 
         uri = URI.parse(File.join(server_url, "proxy", port.to_s))
diff --git a/lib/browsermob/proxy/server.rb b/lib/browsermob/proxy/server.rb
index 84e18e4..8345faf 100644
--- a/lib/browsermob/proxy/server.rb
+++ b/lib/browsermob/proxy/server.rb
@@ -43,8 +43,8 @@ def url
         "http://localhost:#{port}"
       end
 
-      def create_proxy(port = nil)
-        Client.from url, port
+      def create_proxy(port = nil, args={})
+        Client.from url, port, args
       end
 
       def stop