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API giving 503 service unavailable when ConcurrentRateLimit policy is placed


Hi

I have attached ConcurrentRateLimit policy to protect my backend as described below

http://docs.apigee.com/api-services/reference/concurrent-rate-limit-policy

Now when my API from backend returns 404 (Not Found) , ConcurrentRateLimit policy fails at Response Flow at TargetEndPoint and converts it into 503 (Service Unavailable) which is incorrect.

I am attaching the proxy bundle and the trace session. Please advise

Thanks

concurrent-issue.zip

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