HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>ajaxTransport factory skeleton</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; }
  </style>
</head>
<body>
  <button type="button" id="run-demo">Run demo transport</button>
  <div class="log">No HTTP — custom transport handles demo:// URLs.</div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $.ajaxTransport("demo", function(options) {
      if (options.type === "GET" && options.url.indexOf("demo://") === 0) {
        return {
          send: function(headers, completeCallback) {
            var payload = options.url.replace("demo://", "");
            completeCallback(200, "success", { text: "Demo says: " + payload });
          },
          abort: function() {}
        };
      }
    });

    $("#run-demo").on("click", function() {
      $.ajax({ url: "demo://Hello transport", dataType: "demo" })
        .done(function(text) { $(".log").text(text); });
    });
  </script>
</body>
</html>

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jQuery.ajaxTransport() — factory skeleton (Try It)