Merge pull request #122 from 5apps/bugfix/121-set_content_type_on_head

Set Content-Type header on HEAD requests

lib/remote_storage/rest_provider.rb

@@ -46,6 +46,7 @@ module RemoteStorage
       # Set the response headers for a 304 or 200 response
       server.headers["ETag"]          = %Q("#{metadata["e"]}")
       server.headers["Last-Modified"] = Time.at(metadata["m"].to_i / 1000).httpdate
+      server.headers["Content-Type"]  = metadata["t"]
 
       if none_match.include? %Q("#{metadata["e"]}")
         server.halt 304

spec/shared_examples.rb

@@ -614,6 +614,8 @@ shared_examples_for 'a REST adapter' do
             last_response.status.must_equal 200
             last_response.headers["ETag"].must_equal "\"0815etag\""
             last_response.headers["Cache-Control"].must_equal "no-cache"
+            last_response.headers["Last-Modified"].must_equal "Fri, 04 Mar 2016 12:20:18 GMT"
+            last_response.headers["Content-Type"].must_equal "text/plain; charset=utf-8"
           end
 
           it "responds with 304 when IF_NONE_MATCH header contains the ETag" do