Move the Content-Type format validation with the other validations

lib/remote_storage/rest_provider.rb

@@ -118,6 +118,9 @@ module RemoteStorage
     end
 
     def put_data(user, directory, key, data, content_type)
+      # Do not try to perform the PUT request when the Content-Type does not
+      # look like a MIME type
+      server.halt 415 unless content_type.match(/^.+\/.+/i)
       server.halt 400 if server.env["HTTP_CONTENT_RANGE"]
       server.halt 409, "Conflict" if has_name_collision?(user, directory, key)
 
@@ -506,10 +509,5 @@ module RemoteStorage
       items
     end
 
-    def validate_content_type(content_type)
-      # Do not try to perform the PUT request when the Content-Type does not
-      # look like a MIME type
-      server.halt 415 unless content_type.match(/^.+\/.+/i)
-    end
   end
 end