fix error

lib/roda/proxy.rb

@@ -38,9 +38,16 @@ class Roda
           client = NetX::HTTPUnix.new(_sock_url)
           request_class = Net::HTTP.const_get(:"#{env['REQUEST_METHOD'].to_s.downcase.capitalize}")
           req = request_class.new(_proxy_url.to_s, _proxy_headers)
-          
+          env_body = env["rack.input"].read
+          env_content_type = env['CONTENT_TYPE']
+          unless env_body.nil?
+            req.body = env_body
+          end
+          unless env_content_type.nil?
+            req.content_type = env_content_type
+          end
           f_response = client.request(req)
-#           p f_response
+          f_response.content_length = nil #prevent duplicate header Content-Length and content-length
           _respond(f_response)
         end
         
@@ -71,12 +78,15 @@ class Roda
         end
         def _proxy_url
           uri = URI("#{roda_class.opts[:proxy_path]}#{env['PATH_INFO'][1..-1]}")
-          uri.query = env['QUERY_STRING']
+          if !env['QUERY_STRING'].empty?
+            uri.query = env['QUERY_STRING']
+          end
           uri
         end
         
         def _proxy_headers
-          env
+          env_host = env['HTTP_HOST'].to_s
+          env_new = env
             .select { |k, _v| k.start_with? 'HTTP_' }
             .reject { |k, _v| k == 'HTTP_HOST' }
             .transform_keys do |k| 
@@ -85,9 +95,10 @@ class Roda
                .map(&:capitalize)
                .join('-')
             end
-            .merge({ 
+          if env_host
-                     'Host' => "127.0.0.1"
+            env_new.merge!({'Host' => env_host})
-                   })
+          end
+          env_new
         end
         
         def _respond(proxied_response)
@@ -98,6 +109,7 @@ class Roda
             .each { |k, v| response[k] = v }
           response.write(proxied_response.body)
         end
+        
       end
     end