HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>ajaxPrefilter Authorization</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 520px; }
    button { padding: 8px 14px; cursor: pointer; background: #2563eb; color: #fff; border: none; border-radius: 6px; }
    .log { margin-top: 14px; padding: 12px; background: #eff6ff; border-radius: 6px; font-size: 14px; }
    .hint { color: #64748b; font-size: 13px; margin-top: 8px; }
  </style>
</head>
<body>
  <button type="button" id="fetch">Fetch user (with token)</button>
  <div class="log">Prefilter adds Authorization header automatically.</div>
  <p class="hint">Check Network tab → Request Headers for Bearer demo-token-abc123</p>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    var apiToken = "demo-token-abc123";

    $.ajaxPrefilter(function(options) {
      var previousBeforeSend = options.beforeSend;
      options.beforeSend = function(xhr, settings) {
        xhr.setRequestHeader("Authorization", "Bearer " + apiToken);
        if ($.isFunction(previousBeforeSend)) {
          return previousBeforeSend.call(this, xhr, settings);
        }
      };
    });

    $("#fetch").on("click", function() {
      $.ajax({
        url: "https://jsonplaceholder.typicode.com/users/1",
        dataType: "json"
      }).done(function(user) {
        $(".log").text("Authorized fetch OK: " + user.email);
      });
    });
  </script>
</body>
</html>

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jQuery.ajaxPrefilter() — Authorization header (Try It)