Penetration testing, also called pen testing, is the practice of testing a computer system, network or web application to find security vulnerabilities that an attacker could exploit. Web Applications are mainly penetrated against OWASP top 10 standards (https://www.cloudflare.com/learning/security/threats/owasp-top-10/) which are most common security vulnerabilities which an attacker tries to exploit always.
When a cross origin request is initiated by a client app, Browsers make a preflight request before executing an actual request. Example: Assume that example.com makes an authenticated POST request to a server api.service.com. The browser makes an additional OPTIONS request to api.service.com before making the actual request.
Code duplication is a common industry problem. It happens When multiple programmers are working on different parts of the same program at the same time When specific parts of code look different but actually perform the same job. This kind of duplication can be hard to find and fix. When rushing to meet deadlines
Amazon Cognito user pool allows users to sign-in through an external identity provider (federation), such as Okta. A user pool integrated with Okta allows users in your Okta app to get user pool tokens from Amazon Cognito and authenticate apps that use cognito.