调用中介程序在WSO2中引发错误

当我尝试在blocking=“true”的序列中使用call mediator时，它会在send mediator正常工作时抛出一个错误。有人能指出我错在哪里吗。
我正在使用WSO2 APIM 2.6.0

代码：

<call blocking="true">
    <endpoint>
       <http method="get" uri-template="http://10.10.10.10:10/XYZ/rest/1.0/abc/{uri.var.userId}"/>
    </endpoint>
</call>             
<respond/>

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尝试在调用中介程序之前添加此项

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尝试在调用调解器之前添加此项

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是404。似乎URL错误。如果我替换Send而不是Call，它会工作。我无法确定为什么呼叫出现404错误。这是404。似乎URL错误。如果我替换Send而不是Call，它会工作。我无法确定呼叫给出404错误的原因。谢谢，呼叫添加了附加URL上下文参数，为什么要在端点附加上下文URL，如果您知道，请解释。再次感谢它的工作。默认情况下，它将传入请求的后半部分（即REST_URL_后缀）附加到传出请求。谢谢，Call正在添加附加URL上下文参数，如果您知道，为什么要将上下文URL附加到端点请解释。再次感谢它的工作。默认情况下，它将传入请求的后半部分（即REST\u URL\u后缀）附加到传出请求。

INFO {org.apache.axis2.transport.http.HTTPSender} -  Unable to sendViaGet to url[http://10.10.10.10:10/XYZ/rest/1.0/abc/USERX] {org.apache.axis2.transport.http.HTTPSender}
org.apache.axis2.AxisFault: Transport error: 404 Error:
        at org.apache.axis2.transport.http.HTTPSender.handleResponse(HTTPSender.java:371)
        at org.apache.axis2.transport.http.HTTPSender.sendViaGet(HTTPSender.java:109)
        at org.apache.axis2.transport.http.HTTPSender.send(HTTPSender.java:63)
        at org.apache.axis2.transport.http.CommonsHTTPTransportSender.writeMessageWithCommons(CommonsHTTPTransportSender.java:459)
        at org.apache.axis2.transport.http.CommonsHTTPTransportSender.invoke(CommonsHTTPTransportSender.java:286)
        at org.apache.axis2.engine.AxisEngine.send(AxisEngine.java:442)
        at org.apache.axis2.description.OutInAxisOperationClient.send(OutInAxisOperation.java:441)
        at org.apache.axis2.description.OutInAxisOperationClient.executeImpl(OutInAxisOperation.java:227)
        at org.apache.axis2.client.OperationClient.execute(OperationClient.java:149)
        at org.apache.synapse.message.senders.blocking.BlockingMsgSender.sendReceive(BlockingMsgSender.java:490)
        at org.apache.synapse.message.senders.blocking.BlockingMsgSender.send(BlockingMsgSender.java:382)
        at org.apache.synapse.core.axis2.Axis2FlexibleMEPClient.send(Axis2FlexibleMEPClient.java:88)
        at org.apache.synapse.core.axis2.Axis2Sender.sendOn(Axis2Sender.java:85)
        at org.apache.synapse.core.axis2.Axis2SynapseEnvironment.send(Axis2SynapseEnvironment.java:547)
        at org.apache.synapse.endpoints.AbstractEndpoint.send(AbstractEndpoint.java:384)
        at org.apache.synapse.endpoints.HTTPEndpoint.send(HTTPEndpoint.java:85)
        at org.apache.synapse.mediators.builtin.CallMediator.handleBlockingCall(CallMediator.java:164)
        at org.apache.synapse.mediators.builtin.CallMediator.mediate(CallMediator.java:119)
        at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:108)
        at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:70)
        at org.apache.synapse.config.xml.AnonymousListMediator.mediate(AnonymousListMediator.java:37)
        at org.apache.synapse.config.xml.SwitchCase.mediate(SwitchCase.java:69)
        at org.apache.synapse.mediators.filters.SwitchMediator.mediate(SwitchMediator.java:134)
        at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:108)
        at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:70)
        at org.apache.synapse.mediators.filters.FilterMediator.mediate(FilterMediator.java:169)
        at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:108)
        at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:70)
        at org.apache.synapse.mediators.base.SequenceMediator.mediate(SequenceMediator.java:158)
        at org.wso2.carbon.apimgt.gateway.handlers.ext.APIManagerExtensionHandler.mediate(APIManagerExtensionHandler.java:66)
        at org.wso2.carbon.apimgt.gateway.handlers.ext.APIManagerExtensionHandler.handleRequest(APIManagerExtensionHandler.java:75)
        at org.apache.synapse.rest.API.process(API.java:325)