API Gateway HTTP API Proxy Integration re-encodes the query parameters

Hi,

Here is my configuration: mydomain.com -> API GW Custom Domain -> HTTP API -> Route (/api/{+proxy}) -> VPCLink -> ALB -> HTTPS Listener -> TargetGroup (Type: Instance) -> ECS Fargate Service

Our frontend clients sends an array as a query parameter but API GW encodes the parameters and the fargate application can not process the parameters. For example assume that client makes this request; https://mydomain.com/hello/world?key=value1,value2,value3 Request captured on backend is https://mydomain.com/hello/world?key=value1%2Cvalue2%2Cvalue3

How can I prevent this behavior? Is there any way?

Thanks