我正在尝试使用 Mailchimp 发送活动。在调用此端点时，我收到类似“传输错误：404 错误：未找到”的错误。谁能帮我解决这个问题？
注意：当我通过点击直接 mailchimp url 尝试使用 Postman 时，它工作正常。
电线日志：
[2020-10-13 11:11:02,611] [] INFO - ApplicationManager Successfully Deployed Carbon Application : QRSagMailchimpIntegrator-CAR_1.0.0 {super-tenant}
[2020-10-13 11:11:14,590] [] DEBUG - wire HTTP-Listener I/O dispatcher-4 >> "POST /campaignSend/predict/sendCampaignId=d164a3989d?AuthKey=3216f54e-b6d9-11e6-80f5-76304dec7eb7 HTTP/1.1[\r][\n]"
[2020-10-13 11:11:14,591] [] DEBUG - wire HTTP-Listener I/O dispatcher-4 >> "User-Agent: PostmanRuntime/7.26.5[\r][\n]"
[2020-10-13 11:11:14,592] [] DEBUG - wire HTTP-Listener I/O dispatcher-4 >> "Accept: */*[\r][\n]"
[2020-10-13 11:11:14,594] [] DEBUG - wire HTTP-Listener I/O dispatcher-4 >> "Cache-Control: no-cache[\r][\n]"
[2020-10-13 11:11:14,595] [] DEBUG - wire HTTP-Listener I/O dispatcher-4 >> "Postman-Token: 5a44668a-6947-4958-ad24-76fef6ddb62e[\r][\n]"
[2020-10-13 11:11:14,597] [] DEBUG - wire HTTP-Listener I/O dispatcher-4 >> "Host: localhost:8280[\r][\n]"
[2020-10-13 11:11:14,598] [] DEBUG - wire HTTP-Listener I/O dispatcher-4 >> "Accept-Encoding: gzip, deflate, br[\r][\n]"
[2020-10-13 11:11:14,599] [] DEBUG - wire HTTP-Listener I/O dispatcher-4 >> "Connection: keep-alive[\r][\n]"
[2020-10-13 11:11:14,600] [] DEBUG - wire HTTP-Listener I/O dispatcher-4 >> "Content-Length: 0[\r][\n]"
[2020-10-13 11:11:14,601] [] DEBUG - wire HTTP-Listener I/O dispatcher-4 >> "[\r][\n]"
[2020-10-13 11:11:14,684] [] INFO - LogMediator To: /campaignSend/predict/sendCampaignId=d164a3989d?AuthKey=3216f54e-b6d9-11e6-80f5-76304dec7eb7, MessageID: urn:uuid:aa380541-04f4-4bae-8d8a-d727a7f
a45ba, Direction: request, Welcome Logger = === Send Campaigns ===, Campaign ID = d164a3989d
[2020-10-13 11:11:15,742] [] INFO - HTTPSender Unable to sendViaPost to url[https://us17.api.mailchimp.com/3.0/campaigns/d164a3989d/actions/send/predict/sendCampaignId=d164a3989d?AuthKey=3216f54e-b
6d9-11e6-80f5-76304dec7eb7]
org.apache.axis2.AxisFault: Transport error: 404 Error: Not Found
at org.apache.axis2.transport.http.HTTPSender.handleResponse(HTTPSender.java:326)
at org.apache.axis2.transport.http.HTTPSender.sendViaPost(HTTPSender.java:196)
at org.apache.axis2.transport.http.HTTPSender.send(HTTPSender.java:77)
at org.apache.axis2.transport.http.CommonsHTTPTransportSender.writeMessageWithCommons(CommonsHTTPTransportSender.java:451)
at org.apache.axis2.transport.http.CommonsHTTPTransportSender.invoke(CommonsHTTPTransportSender.java:278)
at org.apache.axis2.engine.AxisEngine.send(AxisEngine.java:442)
at org.apache.axis2.description.OutInAxisOperationClient.send(OutInAxisOperation.java:430)
at org.apache.axis2.description.OutInAxisOperationClient.executeImpl(OutInAxisOperation.java:225)
at org.apache.axis2.client.OperationClient.execute(OperationClient.java:149)
at org.apache.synapse.message.senders.blocking.BlockingMsgSender.sendReceive(BlockingMsgSender.java:302)
at org.apache.synapse.message.senders.blocking.BlockingMsgSender.send(BlockingMsgSender.java:211)
at org.apache.synapse.mediators.builtin.CallMediator.handleBlockingCall(CallMediator.java:150)
at org.apache.synapse.mediators.builtin.CallMediator.mediate(CallMediator.java:113)
at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:97)
at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:59)
at org.apache.synapse.mediators.base.SequenceMediator.mediate(SequenceMediator.java:158)
at org.apache.synapse.rest.Resource.process(Resource.java:343)
at org.apache.synapse.rest.API.process(API.java:399)
at org.apache.synapse.rest.RESTRequestHandler.apiProcess(RESTRequestHandler.java:123)
at org.apache.synapse.rest.RESTRequestHandler.dispatchToAPI(RESTRequestHandler.java:101)
at org.apache.synapse.rest.RESTRequestHandler.process(RESTRequestHandler.java:69)
at org.apache.synapse.core.axis2.Axis2SynapseEnvironment.injectMessage(Axis2SynapseEnvironment.java:304)
at org.apache.synapse.core.axis2.SynapseMessageReceiver.receive(SynapseMessageReceiver.java:78)
at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:180)
at org.apache.synapse.transport.passthru.ServerWorker.processNonEntityEnclosingRESTHandler(ServerWorker.java:326)
at org.apache.synapse.transport.passthru.ServerWorker.processEntityEnclosingRequest(ServerWorker.java:372)
at org.apache.synapse.transport.passthru.ServerWorker.run(ServerWorker.java:151)
at org.apache.axis2.transport.base.threads.NativeWorkerPool$1.run(NativeWorkerPool.java:172)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
[2020-10-13 11:11:15,778] [] INFO - LogMediator To: https://us17.api.mailchimp.com/3.0/campaigns/d164a3989d/actions/send/, MessageID: urn:uuid:aa380541-04f4-4bae-8d8a-d727a7fa45ba, Direction: reque
st, FAUALTYYYYYYYYYYYYYYYYYY************* = Transport error: 404 Error: Not Found
[2020-10-13 11:11:15,781] [] DEBUG - wire HTTP-Listener I/O dispatcher-4 << "HTTP/1.1 202 Accepted[\r][\n]"
[2020-10-13 11:11:15,782] [] DEBUG - wire HTTP-Listener I/O dispatcher-4 << "Date: Tue, 13 Oct 2020 05:41:15 GMT[\r][\n]"
[2020-10-13 11:11:15,783] [] DEBUG - wire HTTP-Listener I/O dispatcher-4 << "Transfer-Encoding: chunked[\r][\n]"
[2020-10-13 11:11:15,784] [] DEBUG - wire HTTP-Listener I/O dispatcher-4 << "Connection: keep-alive[\r][\n]"
[2020-10-13 11:11:15,785] [] DEBUG - wire HTTP-Listener I/O dispatcher-4 << "[\r][\n]"
[2020-10-13 11:11:15,785] [] DEBUG - wire HTTP-Listener I/O dispatcher-4 << "0[\r][\n]"
[2020-10-13 11:11:15,786] [] DEBUG - wire HTTP-Listener I/O dispatcher-4 << "[\r][\n]"
邮递员：（直接 Mailchimp URL）
API 代码：
<api context="/campaignSend" name="campaign_send_v1" xmlns="http://ws.apache.org/ns/synapse">
<resource method="POST" uri-template="/predict/sendCampaignId={campaignId}?AuthKey={secKey}">
<inSequence>
<log>
<property name="Welcome Logger" value="=== Send Campaigns ==="/>
<property expression="get-property('uri.var.campaignId')" name="Campaign ID"/>
</log>
<property description="secKey" expression="get-property('uri.var.secKey')" name="secKey" scope="default" type="STRING"/>
<property description="ESB-Authentication" expression="get-property('QRSag-VBFeedsAuthKey')" name="authKey" scope="default" type="OM"/>
<property description="FeedsStoredAuthKey" expression="$ctx:authKey//*[local-name()='SecurityToken']" name="authenticatekey" scope="default" type="STRING"/>
<!-- ==================== Check authentication ==================== -->
<filter description="CheckUserAPIValidation" xpath="get-property('secKey') = get-property('authenticatekey')">
<then/>
<else>
<payloadFactory media-type="json">
<format>{"errorCode":"$1","errorTrace":"$2"}</format>
<args>
<arg value="QRSaG - 401"/>
<arg value="Invalid Authentication.Contact QRSagSupport"/>
</args>
</payloadFactory>
<log level="custom">
<property expression="json-eval($.)" name="===API Authentication Failed==="/>
</log>
<respond/>
</else>
</filter>
<property name="Authorization" scope="transport" type="STRING" value="Basic XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"/>
<call blocking="true">
<endpoint key="sendCampaign"/>
<timeout>
<duration>17000000</duration>
<responseAction>fault</responseAction>
</timeout>
</call>
<log>
<property expression="json-eval($.)" name="LoggerText_JsonResponse"/>
</log>
<respond/>
</inSequence>
<outSequence/>
<faultSequence>
<log>
<property expression="get-property('ERROR_MESSAGE')" name="FAUALTYYYYYYYYYYYYYYYYYY*************"/>
</log>
</faultSequence>
</resource>
端点值：
<?xml version="1.0" encoding="UTF-8"?>
<endpoint name="sendCampaign" xmlns="http://ws.apache.org/ns/synapse">
<http method="post" uri-template="https://us17.api.mailchimp.com/3.0/campaigns/{uri.var.campaignId}/actions/send/"/>
</endpoint>