Error handling Pattern for Apigee X With Shared Flow. What is the best practice?

[FernandoIpnet]

I based myself on this publication (An error handling pattern for Apigee proxies ) and implemented a proxy in apigee X as shown in the attachment. But it didn't work well with Apigee X. Is there a more recent pattern than the one suggested by @ozanseymen or some best practice adopted by the apigee community?

<ProxyEndpoint name="default">

  <Description/>

  <FaultRules>

    <FaultRule name="Spike Arrest Fault">

      <Step>

        <Name>AM-RateLimitErrorSet429</Name>

        <Condition>

            (fault.name = "SpikeArrestViolation") or

            (fault.name = "InvalidMessageWeight") or

            (fault.name = "ErrorLoadingProperties") or

            (fault.name = "InvalidAllowedRate") or

            (fault.name = "FailedToResolveSpikeArrestRate")

        </Condition>

      </Step>

    </FaultRule>

    <FaultRule name="Quota Fault">

      <Step>

        <Name>AM-RateLimitErrorSet429</Name>

        <Condition>

            (fault.name = "QuotaViolation") or

            (fault.name = "InvalidMessageWeight") or

            (fault.name = "InvalidQuotaInterval") or

            (fault.name = "FailedToResolveQuota\IntervalReference") or

            (fault.name = "FailedToResolveQuota\IntervalTimeUnitReference") or

            (fault.name = "InvalidQuotaTimeUnit")

        </Condition>

      </Step>

    </FaultRule>

    <FaultRule name="Forbidden Fault">

      <Condition>(error.status.code = 403)</Condition>

      <Step>

        <Name>AM-SetForbidden</Name>

      </Step>

    </FaultRule>

    <FaultRule name="InvalidBasicAuthenticationSource">

      <Condition>(fault.name = "InvalidBasicAuthenticationSource") || (fault.name = InvalidApiKeyForGivenResource)</Condition>

      <Step>

        <Name>AM-SetUnathorizedVariables</Name>

      </Step>

    </FaultRule>

    <FaultRule name="InvalidApiKey">

      <Step>

        <Name>AM-SetUnathorizedVariables</Name>

        <Condition>(fault.name = "DeveloperStatusNotActive") || (fault.name = "FailedToResolveAPIKey") || (fault.name == "InvalidApiKey") || (oauthV2.VA-VerifyApiKey.failed = true)</Condition>

      </Step>

      <Step>

        <Name>AM-SetUnathorizedVariables</Name>

        <Condition>verifyapikey.VA-VerifyApiKey.client_secret != private.apisecret</Condition>

      </Step>

    </FaultRule>

    <FaultRule name="servicecallout Fault">

      <Condition>(servicecallout.SC-GetTokenFunctionBarramento.failed = true)</Condition>

      <Step>

        <Name>AM-SetInternalServerErrorVariables</Name>

      </Step>

    </FaultRule>

    <FaultRule name="NotFound Fault">

      <Condition>(error.reason.phrase = "Not Found")</Condition>

      <Step>

        <Name>AM-SetNotFound</Name>

      </Step>

    </FaultRule>

    <FaultRule name="Bad-Request-Fault">

      <Condition>                      

          (raisefault.RF-BadRequestPacienteHeader.failed = true) or              

          (error.reason.phrase = "Bad Request") or

          (error.status.code = 400)      

      </Condition>

      <Step>

        <Name>AM-SetBadRequest</Name>

      </Step>

    </FaultRule>

    <FaultRule name="Bad Request Fault">

      <Condition>

          (fault.name = "ExceededContainerDepth") or

          (fault.name = "ExceededObjectEntryCount") or

          (fault.name = "ExceededArrayElementCount") or

          (fault.name = "ExceededObjectEntryNameLength") or

          (fault.name = "ExceededStringValueLength") or

          (fault.name = "SourceUnavailable") or

          (fault.name = "NonMessageVariable") or

          (fault.name = "ExecutionFailed") or

          (raisefault.RF-BadRequest.failed = true) or                  

          (error.reason.phrase = "Bad Request")          

      </Condition>

      <Step>

        <Name>AM-SetBadRequest</Name>

      </Step>

    </FaultRule>

    <FaultRule name="Invalid Access Token">

      <Condition>

          (fault.name = "FailedToResolveAccessToken") or          

          (raisefault.RF-Unauthorized.failed = true) or

          (fault.name = "FailedToResolveToken") or

          (fault.name = "FailedToResolveAuthorizationCode") or

          (fault.name = "InsufficientScope") or          

          (fault.name = "InvalidAccessToken") or

          (raisefault.RF-Unauthorized.failed = true) or

          (verifyapikey.VA-VerifyApiKey.failed = true) or

          (fault.name = "InvalidOperation")

      </Condition>

      <Step>

        <Name>AM-SetUnathorizedVariables</Name>

      </Step>

    </FaultRule>

    <FaultRule name="Internal server error">

      <Step>

        <Name>AM-SetInternalServerErrorVariables</Name>

        <Condition>

            (fault.name = "UnresolvedVariable") or          

            (fault.name = "SetVariableFailed") or

            (fault.name = "InvalidVariableName") or

            (fault.name = "ScriptExecutionFailed") or

            (fault.name = "SourceMessageNotAvailable") or  

            (raisefault.RF-Unauthorized.failed = true) or

            (verifyapikey.VA-VerifyApiKey.failed = true) or                        

            (fault.name = "InvalidPayload")

        </Condition>

      </Step>

    </FaultRule>

    <FaultRule name="Bad-Request-Fault">

      <Condition>          

          (raisefault.RF-BadRequest.failed = true) or    

          (raisefault.RF-BadRequestPacienteHeader.failed = true) or              

          (error.reason.phrase = "Bad Request") or

          (error.status.code = 400)      

      </Condition>

      <Step>

        <Name>AM-SetBadRequest</Name>

      </Step>

    </FaultRule>

    <FaultRule name="Bad Request Fault">

      <Condition>

          (fault.name = "ExceededContainerDepth") or

          (fault.name = "ExceededObjectEntryCount") or

          (fault.name = "ExceededArrayElementCount") or

          (fault.name = "ExceededObjectEntryNameLength") or

          (fault.name = "ExceededStringValueLength") or

          (fault.name = "SourceUnavailable") or

          (fault.name = "NonMessageVariable") or

          (fault.name = "ExecutionFailed") or

          (raisefault.RF-BadRequest.failed = true) or                  

          (error.reason.phrase = "Bad Request")          

      </Condition>

      <Step>

        <Name>AM-SetBadRequest</Name>

      </Step>

    </FaultRule>

  </FaultRules>

  <DefaultFaultRule name="fault-rule">

    <AlwaysEnforce>true</AlwaysEnforce>

    <Step>

      <Condition>(flow.error.code = null) and (fault.name = null)</Condition>

      <Name>AM-SetInternalServerErrorVariables</Name>

    </Step>

    <Step>

      <Condition>(fault.name != "ErrorResponseCode")</Condition>

      <Name>RF-JsonError</Name>

    </Step>

  </DefaultFaultRule>

  <PreFlow name="PreFlow">

[AlexET]

Hello @FernandoIpnet, we saw your question and wanted to let you know we’re keeping it on our radar. We’ll also invite others in the community to pitch in and share their thoughts.

[ssvaidyanathan]

@FernandoIpnet - have you tried this