WSO2 ESB：WSO2 REST API 调用中的 XML 响应未解析

我在 WSO2 ESB (4.8.1) 代理服务中处理来自 REST API 的纯 XML 响应时遇到问题。我的 outSequence 显然期望 API 调用结果有效负载是 SOAP 消息，但事实并非如此（纯 XML），从而在进一步处理它时导致错误。我使用 HTTP 端点，但使用地址端点时出现相同的错误。我必须使用 GET 作为请求方法，因为 API 不允许 POX。 （这个问题似乎与已经提到的问题类似WSO2 ESB：记录来自 RDF REST 服务的响应并将其转换回 SOAP https://stackoverflow.com/questions/15010453/wso2-esb-log-and-convert-response-from-the-rdf-rest-service-back-to-soap但是它似乎没有在 ESB 4.8.1 中得到修复，我无法使用那里提到的解决方法）

这是我的终点：

<endpoint xmlns="http://ws.apache.org/ns/synapse" name="Alfresco_login">
   <http uri-template="http://localhost:8080/alfresco/service/api/login?u={query.param.name}&pw={query.param.password}" method="get"></http>
</endpoint>

这是代理：

<proxy xmlns="http://ws.apache.org/ns/synapse"
       name="Alfresco_proxy"
       transports="https,http">
   <target endpoint="Alfresco_login">
      <inSequence>
         <property name="query.param.name" value="XXX"/>
         <property name="query.param.password" value="XXX"/>
      </inSequence>
      <outSequence>
         <log/>
         <send/>
      </outSequence>`enter code here`
   </target>
   <description/>
</proxy>

这是我从 API 得到的响应：

<?xml version="1.0" encoding="UTF-8"?>
<ticket>TICKET_605cbf0977db895db9bbc6e5eb6d4dba75454cc4</ticket>

这是我尝试记录响应时遇到的错误：

ERROR_EXCEPTION : org.apache.synapse.SynapseException: Error while building message
ERROR_DETAIL : org.apache.synapse.SynapseException: Error while building message at org.apache.synapse.mediators.AbstractMediator.handleException(AbstractMediator.java:313) at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:70) at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:47) at org.apache.synapse.mediators.base.SequenceMediator.mediate(SequenceMediator.java:131) at org.apache.synapse.core.axis2.Axis2SynapseEnvironment.injectMessage(Axis2SynapseEnvironment.java:268) at org.apache.synapse.core.axis2.SynapseCallbackReceiver.handleMessage(SynapseCallbackReceiver.java:488) at org.apache.synapse.core.axis2.SynapseCallbackReceiver.receive(SynapseCallbackReceiver.java:170) at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:180) at org.apache.synapse.transport.passthru.ClientWorker.run(ClientWorker.java:225) at org.apache.axis2.transport.base.threads.NativeWorkerPool$1.run(NativeWorkerPool.java:172) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:745) Caused by: org.apache.axis2.AxisFault: Error while building Passthrough stream at org.apache.synapse.transport.passthru.util.RelayUtils.handleException(RelayUtils.java:236) at org.apache.synapse.transport.passthru.util.RelayUtils.builldMessage(RelayUtils.java:111) at org.apache.synapse.transport.passthru.util.RelayUtils.buildMessage(RelayUtils.java:82) at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:68) ... 11 more Caused by: org.apache.axiom.soap.SOAPProcessingException: First Element must contain the local name, Envelope , but found ticket at org.apache.axiom.soap.impl.builder.StAXSOAPModelBuilder.constructNode(StAXSOAPModelBuilder.java:305) at org.apache.axiom.soap.impl.builder.StAXSOAPModelBuilder.createOMElement(StAXSOAPModelBuilder.java:252) at org.apache.axiom.soap.impl.builder.StAXSOAPModelBuilder.createNextOMElement(StAXSOAPModelBuilder.java:234) at org.apache.axiom.om.impl.builder.StAXOMBuilder.next(StAXOMBuilder.java:249) at org.apache.axiom.soap.impl.builder.StAXSOAPModelBuilder.getSOAPEnvelope(StAXSOAPModelBuilder.java:204) at org.apache.axiom.soap.impl.builder.StAXSOAPModelBuilder.<init>(StAXSOAPModelBuilder.java:154) at org.apache.axiom.om.impl.AbstractOMMetaFactory.createStAXSOAPModelBuilder(AbstractOMMetaFactory.java:73) at org.apache.axiom.om.impl.AbstractOMMetaFactory.createSOAPModelBuilder(AbstractOMMetaFactory.java:79) at org.apache.axiom.om.OMXMLBuilderFactory.createSOAPModelBuilder(OMXMLBuilderFactory.java:196) at org.apache.axis2.builder.SOAPBuilder.processDocument(SOAPBuilder.java:55) at org.apache.synapse.transport.passthru.util.DeferredMessageBuilder.getDocument(DeferredMessageBuilder.java:118) at org.apache.synapse.transport.passthru.util.RelayUtils.builldMessage(RelayUtils.java:107) ... 13 more

这里有人找到解决这个问题的方法吗？

最终，主要问题出现在正确的 MessageBuilder 配置中。只要服务响应是一个简单的 XML，并且在响应标头中进行了标记，WSO2 就可以将其传递给客户端。一旦响应被标记为不同 - 在我的例子中它是 application/atom+xml，默认的 MessageBuilder 没有应用，因此 WSO2 期望内容是 SOAP。我将构建器配置添加到 \repository\conf\axis2\axis2.xml：

<messageBuilder class="org.apache.axis2.builder.ApplicationXMLBuilder" contentType="application/atom+xml"/>

现在工作正常。

See https://docs.wso2.com/display/ESB480/Working+with+Message+Builders+and+Formatters https://docs.wso2.com/display/ESB480/Working+with+Message+Builders+and+Formatters and https://docs.wso2.com/display/ESB402/Message+Relay+Building+Blocks https://docs.wso2.com/display/ESB402/Message+Relay+Building+Blocks