fix: rename DefaultAction to DefaultActions for ALB Listener

GarrettBeatty · GarrettBeatty · commit 5184c5c86af9 · 2026-04-02T10:45:18.000-04:00
The CloudFormation property for AWS::ElasticLoadBalancingV2::Listener
is 'DefaultActions' (plural), not 'DefaultAction' (singular).

Fixed in:
- TestServerlessApp.ALB/serverless.template (deployed template)
- README.md ALB documentation example
diff --git a/Libraries/src/Amazon.Lambda.Annotations/README.md b/Libraries/src/Amazon.Lambda.Annotations/README.md
@@ -1065,7 +1065,7 @@ The `ALBApi` attribute requires an existing ALB listener. Here is a minimal exam
       "LoadBalancerArn": { "Ref": "MyALB" },
       "Port": 80,
       "Protocol": "HTTP",
-      "DefaultAction": [{ "Type": "fixed-response", "FixedResponseConfig": { "StatusCode": "404" } }]
+      "DefaultActions": [{ "Type": "fixed-response", "FixedResponseConfig": { "StatusCode": "404" } }]
     }
   }
 }
diff --git a/Libraries/test/TestServerlessApp.ALB/serverless.template b/Libraries/test/TestServerlessApp.ALB/serverless.template
@@ -155,7 +155,7 @@
         },
         "Port": 80,
         "Protocol": "HTTP",
-        "DefaultAction": [
+        "DefaultActions": [
           {
             "Type": "fixed-response",
             "FixedResponseConfig": {

Original file line number	Diff line number	Diff line change
@@ -1065,7 +1065,7 @@ The `ALBApi` attribute requires an existing ALB listener. Here is a minimal exam
`1065`	`1065`	`"LoadBalancerArn": { "Ref": "MyALB" },`
`1066`	`1066`	`"Port": 80,`
`1067`	`1067`	`"Protocol": "HTTP",`
`1068`		`- "DefaultAction": [{ "Type": "fixed-response", "FixedResponseConfig": { "StatusCode": "404" } }]`
	`1068`	`+ "DefaultActions": [{ "Type": "fixed-response", "FixedResponseConfig": { "StatusCode": "404" } }]`
`1069`	`1069`	`}`
`1070`	`1070`	`}`
`1071`	`1071`	`}`
Original file line number	Diff line number	Diff line change
`@@ -155,7 +155,7 @@`
`155`	`155`	`},`
`156`	`156`	`"Port": 80,`
`157`	`157`	`"Protocol": "HTTP",`
`158`		`- "DefaultAction": [`
	`158`	`+ "DefaultActions": [`
`159`	`159`	`{`
`160`	`160`	`"Type": "fixed-response",`
`161`	`161`	`"FixedResponseConfig": {`