我从我的API收到了很多502回复：
TID: [-1234] [] [2017-02-13 15:15:13,802] DEBUG {org.wso2.carbon.apimgt.gateway.handlers.security.APIKeyValidator} - Found resource in Cache for key: /Proxy/Temporary/1.0.0/1.0.0/AMQP/{uid}/{topic}:POST {org.wso2.carbon.apimgt.gateway.handlers.security.APIKeyValidator}
TID: [-1234] [] [2017-02-13 15:15:13,802] DEBUG {org.wso2.carbon.apimgt.gateway.handlers.security.APIAuthenticationHandler} - Authenticated API, authentication response relieved: API call failed reason=API_authentication_failure transactionId=urn:uuid:159bd2ab-e1d0-4bc9-9ff1-8458a04165a5 with accessToken=Bearer f9621dbc78f8bcc4a442ab5050c26069 for requestURI=/Proxy/Temporary/1.0.0/AMQP/2d5ccea7-0280-413b-aab2-1c7bac999875/00000004 at time=Mon Feb 13 15:15:13 WET 2017 from clientIP=192.168.11.86, elapsedTimeInMilliseconds=0 {org.wso2.carbon.apimgt.gateway.handlers.security.APIAuthenticationHandler}
TID: [-1234] [] [2017-02-13 15:15:13,902] DEBUG {org.apache.synapse.transport.passthru.connections.SourceConnections} - Shutting down connection forcefully http-incoming-1457 {org.apache.synapse.transport.passthru.connections.SourceConnections}
TID: [] [] [2017-02-13 15:15:13,902] WARN {org.apache.synapse.transport.passthru.SourceHandler} - Illegal incoming connection state: CLOSED . Possibly two send backs are happening for the same request {org.apache.synapse.transport.passthru.SourceHandler}
TID: [] [] [2017-02-13 15:15:13,903] WARN {org.apache.synapse.transport.passthru.SourceHandler} - Trying to write response body while the handler is in an inconsistent state CLOSED {org.apache.synapse.transport.passthru.SourceHandler}
TID: [] [] [2017-02-13 15:15:13,904] DEBUG {org.apache.synapse.transport.passthru.connections.SourceConnections} - Shutting down connection forcefully http-incoming-1457 {org.apache.synapse.transport.passthru.connections.SourceConnections}
TID: [] [] [2017-02-13 15:15:13,904] ERROR {org.apache.synapse.transport.passthru.SourceHandler} - Unexpected I/O error: java.nio.channels.ClosedChannelException {org.apache.synapse.transport.passthru.SourceHandler}
java.nio.channels.ClosedChannelException
at sun.nio.ch.SocketChannelImpl.ensureWriteOpen(SocketChannelImpl.java:270)
at sun.nio.ch.SocketChannelImpl.write(SocketChannelImpl.java:461)
at org.apache.http.nio.reactor.ssl.SSLIOSession.sendEncryptedData(SSLIOSession.java:343)
at org.apache.http.nio.reactor.ssl.SSLIOSession.outboundTransport(SSLIOSession.java:431)
at org.apache.http.impl.nio.reactor.AbstractIODispatch.outputReady(AbstractIODispatch.java:152)
at org.apache.http.impl.nio.reactor.BaseIOReactor.writable(BaseIOReactor.java:180)
at org.apache.http.impl.nio.reactor.AbstractIOReactor.processEvent(AbstractIOReactor.java:342)
at org.apache.http.impl.nio.reactor.AbstractIOReactor.processEvents(AbstractIOReactor.java:316)
at org.apache.http.impl.nio.reactor.AbstractIOReactor.execute(AbstractIOReactor.java:277)
at org.apache.http.impl.nio.reactor.BaseIOReactor.execute(BaseIOReactor.java:105)
at org.apache.http.impl.nio.reactor.AbstractMultiworkerIOReactor$Worker.run(AbstractMultiworkerIOReactor.java:586)
at java.lang.Thread.run(Thread.java:745)
TID: [] [] [2017-02-13 15:15:13,906] DEBUG {org.apache.synapse.transport.passthru.connections.SourceConnections} - Shutting down connection forcefully http-incoming-1457 {org.apache.synapse.transport.passthru.connections.SourceConnections}
TID: [] [] [2017-02-13 15:15:13,906] DEBUG {org.apache.synapse.transport.passthru.SourceHandler} - http-incoming-1457: Keep-Alive connection was closed: http-incoming-1457 {org.apache.synapse.transport.passthru.SourceHandler}
TID: [] [] [2017-02-13 15:15:13,906] DEBUG {org.apache.synapse.transport.passthru.connections.SourceConnections} - Shutting down connection forcefully http-incoming-1457 {org.apache.synapse.transport.passthru.connections.SourceConnections}
虽然这看起来似乎需要花费很长时间，但在大多数情况下，这种反应会伴随着300ms的往返，有时甚至更少。与有效回复大致相同。
我的API有JavaScript序列，脚本一直执行到最后。
我在这里做错了什么？
这是我的API定义：
<api context="/MyAPI/1.0.0" name="admin--MyAPI"
transports="https" version="1.0.0" version-type="context">
<resource faultSequence="fault" methods="POST" uri-template="/AMQP/{uid}/{topic}">
<inSequence>
<filter regex="PRODUCTION" source="$ctx:AM_KEY_TYPE">
<then>
<property
expression="get-property('SYSTEM_TIME')" name="api.ut.backendRequestTime"/>
<send>
<endpoint name="admin--MyAPI_APIsandboxEndpoint_1">
<default/>
</endpoint>
</send>
</then>
<else>
<send>
<endpoint name="admin--MyAPI_APIsandboxEndpoint_1">
<default/>
</endpoint>
</send>
</else>
</filter>
</inSequence>
<outSequence>
<class name="org.wso2.carbon.apimgt.usage.publisher.APIMgtResponseHandler"/>
<send/>
</outSequence>
</resource>
<resource faultSequence="fault" methods="DELETE" uri-template="/AMQP/{uid}">
<inSequence>
<filter regex="PRODUCTION" source="$ctx:AM_KEY_TYPE">
<then>
<property
expression="get-property('SYSTEM_TIME')" name="api.ut.backendRequestTime"/>
<send>
<endpoint name="admin--MyAPI_APIsandboxEndpoint_1">
<default/>
</endpoint>
</send>
</then>
<else>
<send>
<endpoint name="admin--MyAPI_APIsandboxEndpoint_1">
<default/>
</endpoint>
</send>
</else>
</filter>
</inSequence>
<outSequence>
<class name="org.wso2.carbon.apimgt.usage.publisher.APIMgtResponseHandler"/>
<send/>
</outSequence>
</resource>
<resource faultSequence="fault" methods="POST" url-mapping="/AMQP">
<inSequence>
<filter regex="PRODUCTION" source="$ctx:AM_KEY_TYPE">
<then>
<property
expression="get-property('SYSTEM_TIME')" name="api.ut.backendRequestTime"/>
<respond/>
</then>
<else>
<send>
<endpoint name="admin--MyAPI_APIsandboxEndpoint_2">
<default/>
</endpoint>
</send>
</else>
</filter>
</inSequence>
<outSequence>
<class name="org.wso2.carbon.apimgt.usage.publisher.APIMgtResponseHandler"/>
<send/>
</outSequence>
</resource>
<handlers>
<handler class="org.wso2.carbon.apimgt.gateway.handlers.security.CORSRequestHandler">
<property name="apiImplementationType" value="ENDPOINT"/>
</handler>
<handler class="org.wso2.carbon.apimgt.gateway.handlers.security.APIAuthenticationHandler"/>
<handler class="org.wso2.carbon.apimgt.gateway.handlers.throttling.APIThrottleHandler">
<property name="policyKey" value="gov:/apimgt/applicationdata/tiers.xml"/>
<property name="policyKeyApplication" value="gov:/apimgt/applicationdata/app-tiers.xml"/>
<property name="id" value="A"/>
<property name="policyKeyResource" value="gov:/apimgt/applicationdata/res-tiers.xml"/>
</handler>
<handler class="org.wso2.carbon.apimgt.usage.publisher.APIMgtUsageHandler"/>
<handler class="org.wso2.carbon.apimgt.usage.publisher.APIMgtGoogleAnalyticsTrackingHandler">
<property name="configKey" value="gov:/apimgt/statistics/ga-config.xml"/>
</handler>
<handler class="org.wso2.carbon.apimgt.gateway.handlers.ext.APIManagerExtensionHandler"/>
</handlers>
</api>
这是我的序列定义：
<sequence name="admin--MyAPI:v1.0.0--In">
<property action="remove" name="TRANSPORT_HEADERS" scope="axis2"/>
<switch
source="concat(get-property('axis2', 'HTTP_METHOD'), '-', get-property('axis2', 'REST_URL_POSTFIX'))" xmlns:ns3="http://org.apache.synapse/xsd">
<case regex="^POST-/AMQP$">
<script language="js">
// code that executes without errors
</script>
<property name="messageType" scope="axis2" value="application/json"/>
<property action="remove" name="NO_ENTITY_BODY" scope="axis2"/>
<respond/>
</case>
<case regex="^DELETE-/AMQP/[^/]+$">
<script language="js">
// code that executes without errors
</script>
<respond/>
</case>
<case regex="^POST-/AMQP/[^/]+.*">
<property expression="json-eval($.)" name="payload"/>
<property
expression="get-property('axis2', 'ContentType')" name="ContentType"/>
<property
expression="get-property('axis2', 'REST_URL_POSTFIX')" name="REST_URL_POSTFIX"/>
<property
expression="get-property('axis2', 'TRANSPORT_HEADERS')" name="TRANSPORT_HEADERS"/>
<script language="js">
// code that executes without errors
</script>
<property name="FORCE_SC_ACCEPTED" scope="axis2"
type="STRING" value="true"/>
<property name="HTTP_SC" scope="axis2" value="202"/><!-- otherwise won't always be 202 -->
<property name="OUT_ONLY" scope="default" type="STRING" value="true"/>
<respond/>
</case>
<default/>
</switch>
</sequence>