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feat(elasticloadbalancingv2): client keepalive for ALB (#29504)
### Issue # (if applicable) Closes #29503. ### Reason for this change [ALB supports configuring client keepalive duration](https://aws.amazon.com/jp/about-aws/whats-new/2024/03/application-load-balancer-http-keepalive-duration/) but AWS CDK cannot do that. ### Description of changes Add `clientKeepAlive` properties to `ApplicationLoadBalancerProps`. ```ts new elbv2.ApplicationLoadBalancer(stack, 'LB', { vpc, clientKeepAlive: Duration.seconds(250), }); ``` ### Description of how you validated changes I've added both integ and unit tests ### Checklist - [x] My code adheres to the [CONTRIBUTING GUIDE](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md) and [DESIGN GUIDELINES](https://github.com/aws/aws-cdk/blob/main/docs/DESIGN_GUIDELINES.md) ---- *By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*
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‎packages/@aws-cdk-testing/framework-integ/test/aws-elasticloadbalancingv2/test/integ.alb.attributes.js.snapshot/Elbv2TestDefaultTestDeployAssert82DC2DEA.assets.json

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‎packages/@aws-cdk-testing/framework-integ/test/aws-elasticloadbalancingv2/test/integ.alb.attributes.js.snapshot/aws-cdk-elbv2-integ.assets.json

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‎packages/@aws-cdk-testing/framework-integ/test/aws-elasticloadbalancingv2/test/integ.alb.attributes.js.snapshot/aws-cdk-elbv2-integ.template.json

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"VPCPublicSubnet1SubnetB4246D30": {
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"Type": "AWS::EC2::Subnet",
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"Properties": {
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"VpcId": {
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"Ref": "VPCB9E5F0B4"
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},
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"AvailabilityZone": {
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"Fn::Select": [
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"Key": "Name",
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"Value": "aws-cdk-elbv2-integ/VPC/PublicSubnet1"
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}
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]
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],
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"VpcId": {
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"Ref": "VPCB9E5F0B4"
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}
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}
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},
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"VPCPublicSubnet1RouteTableFEE4B781": {
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"Type": "AWS::EC2::RouteTable",
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"Properties": {
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"VpcId": {
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"Ref": "VPCB9E5F0B4"
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},
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"Tags": [
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{
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"Key": "Name",
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"Value": "aws-cdk-elbv2-integ/VPC/PublicSubnet1"
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}
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]
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],
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"VpcId": {
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"Ref": "VPCB9E5F0B4"
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}
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}
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},
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"VPCPublicSubnet1RouteTableAssociation0B0896DC": {
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"VPCPublicSubnet1DefaultRoute91CEF279": {
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"Type": "AWS::EC2::Route",
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"Properties": {
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"RouteTableId": {
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"Ref": "VPCPublicSubnet1RouteTableFEE4B781"
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},
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"DestinationCidrBlock": "0.0.0.0/0",
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"GatewayId": {
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"Ref": "VPCIGWB7E252D3"
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"RouteTableId": {
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"Ref": "VPCPublicSubnet1RouteTableFEE4B781"
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}
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},
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"DependsOn": [
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"VPCPublicSubnet1NATGatewayE0556630": {
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"Type": "AWS::EC2::NatGateway",
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"Properties": {
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"SubnetId": {
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"Ref": "VPCPublicSubnet1SubnetB4246D30"
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"AllocationId": {
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"Fn::GetAtt": [
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"AllocationId"
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]
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},
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"SubnetId": {
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"Ref": "VPCPublicSubnet1SubnetB4246D30"
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},
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"Tags": [
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{
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"Key": "Name",
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"VPCPublicSubnet2Subnet74179F39": {
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"Type": "AWS::EC2::Subnet",
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"Properties": {
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"VpcId": {
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"Ref": "VPCB9E5F0B4"
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"AvailabilityZone": {
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"Fn::Select": [
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"Key": "Name",
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"Value": "aws-cdk-elbv2-integ/VPC/PublicSubnet2"
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}
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],
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"VpcId": {
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"Ref": "VPCB9E5F0B4"
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},
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"VPCPublicSubnet2RouteTable6F1A15F1": {
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"Type": "AWS::EC2::RouteTable",
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"Properties": {
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"VpcId": {
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"Ref": "VPCB9E5F0B4"
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"Tags": [
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{
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"Key": "Name",
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"Value": "aws-cdk-elbv2-integ/VPC/PublicSubnet2"
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}
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"VpcId": {
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"Ref": "VPCB9E5F0B4"
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"VPCPublicSubnet2RouteTableAssociation5A808732": {
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"VPCPublicSubnet2DefaultRouteB7481BBA": {
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"Type": "AWS::EC2::Route",
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"Properties": {
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"Ref": "VPCPublicSubnet2RouteTable6F1A15F1"
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"DestinationCidrBlock": "0.0.0.0/0",
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"GatewayId": {
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"Ref": "VPCIGWB7E252D3"
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"Ref": "VPCPublicSubnet2RouteTable6F1A15F1"
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"VPCPublicSubnet2NATGateway3C070193": {
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"Properties": {
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"SubnetId": {
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"Ref": "VPCPublicSubnet2Subnet74179F39"
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"AllocationId": {
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"Fn::GetAtt": [
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"AllocationId"
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"Tags": [
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{
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"Key": "Name",
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"VPCPrivateSubnet1Subnet8BCA10E0": {
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"Type": "AWS::EC2::Subnet",
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"Properties": {
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"AvailabilityZone": {
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"Key": "Name",
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"VPCPrivateSubnet1RouteTableAssociation347902D1": {
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"VPCPrivateSubnet1DefaultRouteAE1D6490": {
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"Type": "AWS::EC2::Route",
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"Properties": {
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"DestinationCidrBlock": "0.0.0.0/0",
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"NatGatewayId": {
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"Ref": "VPCPublicSubnet1NATGatewayE0556630"
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"AvailabilityZone": {
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"Key": "Name",
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"VPCPrivateSubnet2DefaultRouteF4F5CFD2": {
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"Type": "AWS::EC2::Route",
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"VPCVPCGW99B986DC": {
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"Type": "AWS::EC2::VPCGatewayAttachment",
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"Properties": {
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"InternetGatewayId": {
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"Ref": "VPCIGWB7E252D3"
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{
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"Key": "routing.http.desync_mitigation_mode",
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"Value": "defensive"
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},
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{
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"Key": "client_keep_alive.seconds",
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"Value": "1000"
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],
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"Scheme": "internet-facing",

‎packages/@aws-cdk-testing/framework-integ/test/aws-elasticloadbalancingv2/test/integ.alb.attributes.js.snapshot/cdk.out

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‎packages/@aws-cdk-testing/framework-integ/test/aws-elasticloadbalancingv2/test/integ.alb.attributes.js.snapshot/integ.json

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‎packages/@aws-cdk-testing/framework-integ/test/aws-elasticloadbalancingv2/test/integ.alb.attributes.js.snapshot/manifest.json

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