HTTP value Set Provider Test returns chinese confusion code

I  create a HTTP Filtered Value Set on  Project Configuration > Configuration Data > Work Items > Attribute Customization > Value Sets :

xml:

<xml>
   <node>
  <id>1</id>
  <make>会议</make>
  <regions>,1,2,</regions>
   </node>
   <node>
  <id>2</id>
  <make>培训</make>
  <regions>,2,</regions>
   </node>
 </xml>

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The xml file contain chinese。

I test the configuration.The reslut:

above value returns chinese confusion code 。

can you help me?