Add gzip middleware when Accept-Encoding includes gzip (#1030)

* Adds gzip middleware to request/response when Accept-Encoding includes gzip
* Adds specs for automatically adding handling of gzipped request/responses

Author: kjeldahl

lib/savon/request.rb

@@ -80,6 +80,12 @@ def configure_logging
       connection.response(:logger, @globals[:logger], headers: @globals[:log_headers]) if @globals[:log]
     end
 
+    def configure_gzip
+      if connection.headers['Accept-Encoding'] && connection.headers['Accept-Encoding'].include?('gzip')
+        connection.request :gzip
+      end
+    end
+
     protected
     attr_reader :connection
   end
@@ -94,6 +100,7 @@ def build
       configure_adapter
       configure_logging
       configure_headers
+      configure_gzip
       connection
     end
 
@@ -121,6 +128,7 @@ def build(options = {})
       configure_adapter
       configure_logging
       configure_redirect_handling
+      configure_gzip
       yield(connection) if block_given?
       connection
     end

spec/savon/request_spec.rb

@@ -274,6 +274,28 @@ def new_soap_request
       end
     end
 
+    describe "gzip" do
+      it "is set when Accept-Encoding with gzip is specified" do
+        globals.headers("Accept-Encoding" => "gzip,deflate")
+        http_connection.expects(:request).with(:gzip)
+
+        new_soap_request.build
+      end
+
+      it "is not set when Acccept-Encoding does not include gzip" do
+        globals.headers("Accept-Encoding" => "deflate")
+        http_connection.expects(:request).with(:gzip).never
+
+        new_soap_request.build
+      end
+
+      it "is not set otherwise" do
+        http_connection.expects(:request).with(:gzip).never
+
+        new_soap_request.build
+      end
+    end
+
     describe "SOAPAction header" do
       it "is set and wrapped in parenthesis" do
         configured_http_request = new_soap_request.build(:soap_action => "findUser")