title: How to change URL after build React project
body: <p>I got some build files after used the command of "npm run build" and then put the build files to our server. Now, I want to change some config files in the build files to change the fetch request. How should I do? Please help me.</p>
  
  <p>(The url is changed by back-end developers, front-end developers just should read a file in the build files.)</p>