Java Servlets and CORS
Last few weeks, I was working on a project that required me to use Java Servlets. Servlet is a class that manages HTTP requests and responses. I ran into CORS (Cross Origin Resourse Sharing) problem when I was working on the project. CORS allowed JavaScript applications to make AJAX requests to another domain when these domains are different. My backend where I use Java Servlets was working because I checked multiple times in the Postmaster. In the frontend, when I used fetch function I was not getting any data. Developer tools pointing to the CORS and Access Control Request Methods. Java Servlets are relatively new to me, and I need to research to make my application working. Here are the solutions that I found: 1. Implement Filter by creating a concrete class. Filter is invoked at the preprocessing and postprocessing of a request. 2. Add filter into web.xml file 3. Install the extension to the browser where we can add whitelisted websites in order to skip the CORS. The first and se