What is Message Processor?

I want to know what is a message processor and how does it routes and process message?

What is the underlying architecture for the message processor? does it contain some kind of Queue for holding the request as I tried hitting message processor and it was able to process many number of request.

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A message processor can process multiple requests at a time. The message processor is where your policies are executed against the request.

Before your request is processed by the message processor, the Edge Router component finds one that's available.

This page has an architecture overview of these components and how they interact with the client and backend systems

https://docs.apigee.com/api-platform/troubleshoot/runtime/503-service-unavailable