Answers for "Network Error at createError (createError.js:16) at XMLHttpRequest.handleError (xhr.js:99)"

Error: Network Error at createError (createError.js:16) at XMLHttpRequest.handleError (xhr.js:117)

header("Access-Control-Allow-Origin: *");
header('Access-Control-Allow-Origin: *');
header('Access-Control-Allow-Methods: POST, GET, OPTIONS');
header('Access-Control-Allow-Headers: *');
header('Access-Control-Max-Age: 1728000');
header("Content-Length: 0");
header("Content-Type: text/plain");