Smart HTTP route failover retry policy and RoutebyPercentage

Article Id: 130387

Status: Published

Updated On: 30-09-2019 06:41

Products:

STARTER PACK-7 , CA Rapid App Security , CA API Gateway , CA API Gateway , CA API Gateway

Issue/Introduction:

HTTP route failover retry: Looking for a routing strategy that if the failure rate is 50% for URL1 it will send to URL2 if URL1 comes back at more than 50% send request to URL1

Routing scenario using javascript and cache objective if URL1 has 50% failure then all the traffic (100%) needs to be routed to URL2, if URL 1 comes online route as normal

http://mcqst02-l22063.lvn.broadcom.net:8080/route1
URL1
-> http://mcqst02-l22067.lvn.broadcom.net/site1/index.html
Failure site
URL2
-> http://mcqst02-l21561.lvn.broadcom.net:8080/test/echo1

Attached policy Export BlockBranch.xml

Summary Route by Percentage: Javascript Math.Floor function with Match.random to determine the amount of traffic route to Site1 & Site2. Decrease the value of the comparison variable to push more data to that specific region. Backend URLs: URL1& URL2 Need to route the traffic to both the urls by applying 90/10 traffic ratio and this is achieved using Math. Floor by executing JavaScript assertion.Now 90% of traffic is routed to URL1 and 10% to URL2 by using the above logic.

Attached policy export RouteByPercentage.xml

Environment:

Release:
Component: APIGTW

Resolution:

Attached policy Export BlockBranch.xml
Javascript and cache to monitor failover count and retries

<Please see attached file for image>

Attached policy export RouteByPercentage.xml
Javascript uses context.setVariable("js.response", Math.floor((Math.random() * 10) + 1));

<Please see attached file for image>