diff --git a/lib/calligraphy/rails/web_dav_requests_controller.rb b/lib/calligraphy/rails/web_dav_requests_controller.rb
index 982bbf5..3084deb 100644
--- a/lib/calligraphy/rails/web_dav_requests_controller.rb
+++ b/lib/calligraphy/rails/web_dav_requests_controller.rb
@@ -29,6 +29,7 @@ module Calligraphy::Rails
 
     private
 
+    # Prevent any request with `.` or `..` as part of the resource ID.
     def verify_resource_scope
       head :forbidden if %w(. ..).any? { |seg| params[:resource].include? seg }
     end
@@ -52,6 +53,7 @@ module Calligraphy::Rails
 
       @resource_class = params[:resource_class] || Calligraphy::Resource
       @resource_root_path = params[:resource_root_path]
+
       @resource = @resource_class.new resource: resource_id, req: request, root_dir: @resource_root_path
     end
 
@@ -137,6 +139,7 @@ module Calligraphy::Rails
 
     def validate_etag(etag_validators, validate_against)
       cache_key = ActiveSupport::Cache.expand_cache_key etag_validators
+
       "W/\"#{Digest::MD5.hexdigest(cache_key)}\"" == validate_against
     end
 
@@ -156,7 +159,8 @@ module Calligraphy::Rails
     end
 
     def options
-      response.headers['DAV'] = '1, 2, 3'
+      response.headers['DAV'] = @resource.dav_compliance
+
       :ok
     end
 
diff --git a/lib/calligraphy/resource/resource.rb b/lib/calligraphy/resource/resource.rb
index 59681c0..5c75214 100644
--- a/lib/calligraphy/resource/resource.rb
+++ b/lib/calligraphy/resource/resource.rb
@@ -30,6 +30,10 @@ module Calligraphy
       raise NotImplementedError
     end
 
+    def dav_compliance
+      '1, 2, 3'
+    end
+
     def delete_collection
       raise NotImplementedError
     end
diff --git a/spec/resource/resource_spec.rb b/spec/resource/resource_spec.rb
index 84cc30e..092ba2b 100644
--- a/spec/resource/resource_spec.rb
+++ b/spec/resource/resource_spec.rb
@@ -29,5 +29,12 @@ RSpec.describe 'Resource' do
         end
       end
     end
+
+    describe '#dav_compliance' do
+      it 'advertises full WebDAV compliance' do
+        resource = Calligraphy::Resource.new
+        expect(resource.dav_compliance).to eq('1, 2, 3')
+      end
+    end
   end
 end