diff --git a/lib/redmine_dmsf/webdav/base_resource.rb b/lib/redmine_dmsf/webdav/base_resource.rb
index d21f2bbe..126e515b 100644
--- a/lib/redmine_dmsf/webdav/base_resource.rb
+++ b/lib/redmine_dmsf/webdav/base_resource.rb
@@ -21,6 +21,7 @@
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
 require 'dav4rack'
+require 'addressable/uri'
 
 module RedmineDmsf
   module Webdav
@@ -88,7 +89,7 @@ module RedmineDmsf
         Confict unless collection?
         entities = children.map{ |child|
           DIR_FILE % [
-            "#{@options[:root_uri_path]}#{URI.encode(child.path)}",
+            "#{@options[:root_uri_path]}#{Addressable::URI.encode(child.path)}",
             child.long_name || child.name, 
             child.collection? ? '' : number_to_human_size(child.content_length),
             child.special_type || child.content_type, 
@@ -96,7 +97,7 @@ module RedmineDmsf
           ]
         } * "\n"
         entities = DIR_FILE % [
-            URI.encode(parent.public_path),
+            Addressable::URI.encode(parent.public_path),
           l(:parent_directory),
           '',
           '',
diff --git a/lib/redmine_dmsf/webdav/dmsf_resource.rb b/lib/redmine_dmsf/webdav/dmsf_resource.rb
index a251181f..c3ca413a 100644
--- a/lib/redmine_dmsf/webdav/dmsf_resource.rb
+++ b/lib/redmine_dmsf/webdav/dmsf_resource.rb
@@ -200,6 +200,7 @@ module RedmineDmsf
         if collection?
           html_display
           response['Content-Length'] = response.body.bytesize.to_s
+          response['Content-Type'] = 'text/html'
         else
           raise Forbidden unless User.current.admin? || User.current.allowed_to?(:view_dmsf_files, project)
           response.body = download # Rack based provider
diff --git a/lib/redmine_dmsf/webdav/index_resource.rb b/lib/redmine_dmsf/webdav/index_resource.rb
index 45e2c709..9b47daa4 100644
--- a/lib/redmine_dmsf/webdav/index_resource.rb
+++ b/lib/redmine_dmsf/webdav/index_resource.rb
@@ -68,6 +68,7 @@ module RedmineDmsf
       def get(request, response)
         html_display
         response['Content-Length'] = response.body.bytesize.to_s
+        response['Content-Type'] = 'text/html'
         OK
       end
 
diff --git a/lib/redmine_dmsf/webdav/project_resource.rb b/lib/redmine_dmsf/webdav/project_resource.rb
index 51fe951e..04d78acf 100644
--- a/lib/redmine_dmsf/webdav/project_resource.rb
+++ b/lib/redmine_dmsf/webdav/project_resource.rb
@@ -97,6 +97,7 @@ module RedmineDmsf
       def get(request, response)
         html_display
         response['Content-Length'] = response.body.bytesize.to_s
+        response['Content-Type'] = 'text/html'
         OK
       end
 
diff --git a/test/integration/webdav/dmsf_webdav_get_test.rb b/test/integration/webdav/dmsf_webdav_get_test.rb
index 81c8eece..8f6d2808 100644
--- a/test/integration/webdav/dmsf_webdav_get_test.rb
+++ b/test/integration/webdav/dmsf_webdav_get_test.rb
@@ -41,13 +41,20 @@ class DmsfWebdavGetTest < RedmineDmsf::Test::IntegrationTest
     assert_response :success
   end
 
+  def test_should_include_response_headers
+    get '/dmsf/webdav', params: nil, headers: @admin
+    assert_response :success
+    assert_equal 'text/html', response.headers['Content-Type']
+    assert response.headers['Content-Length'].to_i > 0, "Content-Length should be > 0, but was #{response.headers['Content-Length']}"
+  end
+
   def test_should_list_dmsf_enabled_project
     get '/dmsf/webdav', params: nil, headers: @admin
     assert_response :success
     assert !response.body.match(@project1.identifier).nil?,
            "Expected to find project #{@project1.identifier} in return data"
     Setting.plugin_redmine_dmsf['dmsf_webdav_use_project_names'] = true
-    project1_uri = URI.encode(RedmineDmsf::Webdav::ProjectResource.create_project_name(@project1))
+    project1_uri = Addressable::URI.encode(RedmineDmsf::Webdav::ProjectResource.create_project_name(@project1))
     get '/dmsf/webdav', params: nil, headers: @admin
     assert_response :success
     assert_no_match @project1.identifier, response.body