Set default http agent with max cached sessions of 50

Author: sagar-rout

src/lambda-edge/shared/shared.ts

@@ -16,6 +16,8 @@ export {
   JwtExpiredError,
 } from "aws-jwt-verify/error";
 
+const DEFAULT_MAX_CACHED_SESSIONS : number = 50;
+
 export interface CookieSettings {
   idToken: string;
   accessToken: string;
@@ -24,6 +26,10 @@ export interface CookieSettings {
   [key: string]: string;
 }
 
+function getDefaultAgent() : Agent {
+  return new Agent({rejectUnauthorized: true, maxCachedSessions: DEFAULT_MAX_CACHED_SESSIONS});
+}
+
 function getDefaultCookieSettings(props: {
   mode: "spaMode" | "staticSiteMode";
   compatibility: "amplify" | "elasticsearch";
@@ -503,7 +509,7 @@ export async function httpPostToCognitoWithRetry(
     ++attempts;
     try {
       return await fetch(url, data, {
-        agent: AGENT,
+        agent: AGENT || getDefaultAgent(),
         ...options,
         method: "POST",
       }).then((res) => {