Utilize HTTP::FormData streaming

http.gemspec

@@ -26,7 +26,7 @@ Gem::Specification.new do |gem|
   gem.required_ruby_version = ">= 2.0"
 
   gem.add_runtime_dependency "http_parser.rb", "~> 0.6.0"
-  gem.add_runtime_dependency "http-form_data", "~> 1.0.1"
+  gem.add_runtime_dependency "http-form_data", ">= 2.0.0-pre2", "< 3"
   gem.add_runtime_dependency "http-cookie",    "~> 1.0"
   gem.add_runtime_dependency "addressable",    "~> 2.3"
 

lib/http/client.rb

@@ -157,9 +157,8 @@ def make_request_body(opts, headers)
           opts.body
         when opts.form
           form = HTTP::FormData.create opts.form
-          headers[Headers::CONTENT_TYPE]   ||= form.content_type
-          headers[Headers::CONTENT_LENGTH] ||= form.content_length
-          form.to_s
+          headers[Headers::CONTENT_TYPE] ||= form.content_type
+          form
         when opts.json
           body = MimeType[:json].encode opts.json
           headers[Headers::CONTENT_TYPE] ||= "application/json; charset=#{body.encoding.name}"

spec/lib/http/client_spec.rb

@@ -158,6 +158,32 @@ def simple_response(body, status = 200)
     end
   end
 
+  describe "passing multipart form data" do
+    it "creates url encoded form data object" do
+      client = HTTP::Client.new
+      allow(client).to receive(:perform)
+
+      expect(HTTP::Request).to receive(:new) do |opts|
+        expect(opts[:body]).to be_a(HTTP::FormData::Urlencoded)
+        expect(opts[:body].to_s).to eq "foo=bar"
+      end
+
+      client.get("http://example.com/", :form => {:foo => "bar"})
+    end
+
+    it "creates multipart form data object" do
+      client = HTTP::Client.new
+      allow(client).to receive(:perform)
+
+      expect(HTTP::Request).to receive(:new) do |opts|
+        expect(opts[:body]).to be_a(HTTP::FormData::Multipart)
+        expect(opts[:body].to_s).to include("content")
+      end
+
+      client.get("http://example.com/", :form => {:foo => HTTP::FormData::Part.new("content")})
+    end
+  end
+
   describe "passing json" do
     it "encodes given object" do
       client = HTTP::Client.new