feat: configure lambda web adapter health check

dangreaves · Sep 20, 2024 · 8cb039a · 8cb039a
1 parent 8461b80
commit 8cb039a
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diff --git a/src/adapter/handler.ts b/src/adapter/handler.ts
@@ -32,6 +32,14 @@ const app = express();
 // Disable X-Powered-By header.
 app.disable("x-powered-by");
 
+/**
+ * Endpoint used by AWS Lambda Web Adapter for readiness checks.
+ * @see https://github.com/awslabs/aws-lambda-web-adapter#readiness-check
+ */
+app.get("/__ping", (_req, res) => {
+  res.status(200).send("Pong");
+});
+
 // Register a route which listens to all requests.
 app.all("*", async (req, res) => {
   /**

diff --git a/src/cdk/GatsbySite.ts b/src/cdk/GatsbySite.ts
@@ -209,8 +209,9 @@ export class GatsbySite extends Construct {
                 layers: [webAdapterLayer, ...(functionOptions.layers ?? [])],
                 environment: {
                   ...functionOptions.environment,
-                  // Required by web adapter.
+                  // Configuration for AWS Lambda Web Adapter.
                   AWS_LAMBDA_EXEC_WRAPPER: "/opt/bootstrap",
+                  AWS_LWA_READINESS_CHECK_PATH: "/__ping",
                 },
               });