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Step1-2：DNS query
- request host name：demo.example.com
- get IP address 6.6.6.6（example）
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Step3：IP diagram is routed to POP of IDC1，and processed by layer 4 load balancer L4LB.
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Step4：L4LB forward diagram to BFE
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Step5：BFE receive HTTP request, identify which product the request belongs to:
- BFE uses field "host" in HTTP header to decide product.
- In this scenario, assume demo.example.com belongs to product "demo".
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Step6：Identify a cluster of product "demo", which would handle this message.
- Based on configured distribution rule of product "demo", identify cluster "demo-static" in this product to handle the message .
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Step7：Identify a sub cluster within "demo-static"
- Based on routing rule in "demo-static", identify sub cluster "demo-static.idc1" to handle this message.
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Step8：Identify instance
- based on configured load balancing policy, identify instance as "a-demo-static-1.idc1".
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Step9：request is sent to instance "a-demo-static-1.idc1".
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Step10：BFE receive response message from "a-demo-static-1.idc1".
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Step11-12：BFE send back response to client, via L4LB.