如何在WSO2 ESB中删除charset=utf-8

我需要调用rest服务，它在头中接受内容类型：application/json，但当我尝试从ESB调用它时。WSO2自动添加字符集=utf-8。我不知道如何删除它

我也使用了ContentType属性，但运气不好

     <property name="HTTP_METHOD" scope="axis2" type="STRING" value="PUT"/>
<property name="ContentType" scope="axis2" type="STRING" value="application/json"/>
                     <header expression="fn:concat('Basic ', get-property('ENCODED_URL'))" name="Authorization" scope="transport" xmlns:ns="http://org.apache.synapse/xsd"/>
                     <payloadFactory media-type="json">
                        <format>{
                                    "name": "XXX_Token",
                                    "type": "XXXX-cf04186e2156_sessionID",
                                    "version": "1.0.1",
                                    "Attribute-N": $1
                                    }
                        </format>
                        <args>
                                <arg expression="$ctx:XXXTokenValue" literal="false" />
                        </args>
                    </payloadFactory>
                     <property name="REST_URL_POSTFIX" scope="axis2" value=""/>
                    <call>
                        <endpoint>
                            <address trace="disable" uri="https://XXXXX:9493/governance/restservices/52b1caba-b507-4f6a-95bc-2ea7b2418e67"/>
                        </endpoint>
                    </call>

日志：

 -  End : Call mediator - Non Blocking Call
TID: [-1] [ESB] [2017-09-21 14:30:37,785] DEBUG {org.apache.synapse.transport.http.wire} -  << "PUT /governance/restservices/5XXXXX2ea7b2418e67 HTTP/1.1[\r][\n]"
TID: [-1] [ESB] [2017-09-21 14:30:37,785] DEBUG {org.apache.synapse.transport.http.wire} -  << "X-AspNet-Version: 4.0.30319[\r][\n]"
TID: [-1] [ESB] [2017-09-21 14:30:37,785] DEBUG {org.apache.synapse.transport.http.wire} -  << "Authorization: Basic YWRtaW46YWRtaW4=[\r][\n]"
TID: [-1] [ESB] [2017-09-21 14:30:37,785] DEBUG {org.apache.synapse.transport.http.wire} -  << "Content-Type: application/json; charset=utf-8[\r][\n]"
TID: [-1] [ESB] [2017-09-21 14:30:37,785] DEBUG {org.apache.synapse.transport.http.wire} -  << "X-Powered-By: ASP.NET[\r][\n]"
TID: [-1] [ESB] [2017-09-21 14:30:37,785] DEBUG {org.apache.synapse.transport.http.wire} -  << "Cache-Control: private, max-age=0[\r][\n]"
TID: [-1] [ESB] [2017-09-21 14:30:37,785] DEBUG {org.apache.synapse.transport.http.wire} -  << "Transfer-Encoding: chunked[\r][\n]"
TID: [-1] [ESB] [2017-09-21 14:30:37,785] DEBUG {org.apache.synapse.transport.http.wire} -  << "Host: XXXXXXz:9493[\r][\n]"
TID: [-1] [ESB] [2017-09-21 14:30:37,785] DEBUG {org.apache.synapse.transport.http.wire} -  << "Connection: K

---

这是ESB 4.9.0[1]中的一个bug。这在以后的版本中可能已经修复

请检查以下属性是否在/repository/conf/passthru-http.properties中可用

http.headers.preserve=内容类型

请注意，您可以将多个标题值添加为逗号分隔的列表

顺便说一句，使用属性messageType设置内容类型。请参阅[2]中有关messageType和ContentType的文档

[1]

[2]