Fix redis connection for https (#75)

Author: stack72

packages/web/src/index.ts

@@ -71,6 +71,10 @@ async function initializeRedisClient(): Promise<RedisClientType> {
 
     // Create Redis client with IAM credentials and TLS
     // TLS is REQUIRED for IAM authentication with AWS ElastiCache
+    //
+    // Based on AWS documentation and examples (Python, Java, Go):
+    // Both username and password (IAM token) must be provided for AUTH
+    // The redis client will send: AUTH username token
     client = createClient({
       socket: {
         host,
@@ -89,6 +93,8 @@ async function initializeRedisClient(): Promise<RedisClientType> {
           return Math.min(retries * 100, 3000); // Exponential backoff, max 3s
         },
       },
+      // Provide both username and IAM-generated token for authentication
+      // This matches AWS documentation for IAM auth with ElastiCache
       username,
       password: token,
     });

packages/web/src/utils/elasticache-iam-auth.ts

@@ -54,10 +54,12 @@ export async function generateIAMAuthToken(
     query.ResourceType = 'ServerlessCache';
   }
 
-  // Create the HTTP request to sign
+  // Create the HTTPS request to sign
+  // IMPORTANT: Must use https:// protocol for signature (even though final token strips the protocol)
+  // This matches the Python implementation in AWS docs
   const request = new HttpRequest({
     method: 'GET',
-    protocol: 'http:',
+    protocol: 'https:',
     hostname: endpoint,
     port,
     path: '/',