added option to allow for streaming large files without loading them into memory

lib/httparty/request.rb

@@ -100,7 +100,7 @@ module HTTParty
           chunks = []
 
           http_response.read_body do |fragment|
-            chunks << fragment
+            chunks << fragment unless options[:stream_body]
             block.call(fragment)
           end
 

spec/httparty/request_spec.rb

@@ -389,7 +389,6 @@ describe HTTParty::Request do
       end
     end
 
-
     describe 'with non-200 responses' do
       context "3xx responses" do
         it 'returns a valid object for 304 not modified' do

spec/httparty_spec.rb

@@ -699,6 +699,16 @@ describe HTTParty do
       end.should == chunks.join
     end
 
+    it "should return an empty body if stream_body option is turned on" do
+      chunks = ["Chunk1", "Chunk2", "Chunk3", "Chunk4"]
+      options = {stream_body: true, format: 'html'}
+      stub_chunked_http_response_with(chunks, options)
+
+      HTTParty.get('http://www.google.com', options) do |fragment|
+        chunks.should include(fragment)
+      end.should == nil
+    end
+
     it "should be able parse response type json automatically" do
       stub_http_response_with('twitter.json')
       tweets = HTTParty.get('http://twitter.com/statuses/public_timeline.json')

spec/support/stub_response.rb

@@ -13,14 +13,14 @@ module HTTParty
       HTTParty::Request.should_receive(:new).and_return(http_request)
     end
 
-    def stub_chunked_http_response_with(chunks)
+    def stub_chunked_http_response_with(chunks, options={format: "html"})
       response = Net::HTTPResponse.new("1.1", 200, nil)
       response.stub(:chunked_data).and_return(chunks)
       def response.read_body(&block)
         @body || chunked_data.each(&block)
       end
 
-      http_request = HTTParty::Request.new(Net::HTTP::Get, 'http://localhost', format: "html")
+      http_request = HTTParty::Request.new(Net::HTTP::Get, 'http://localhost', options)
       http_request.stub_chain(:http, :request).and_yield(response).and_return(response)
 
       HTTParty::Request.should_receive(:new).and_return(http_request)