HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>ajaxSetup global false POST</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 560px; }
    button { padding: 8px 14px; cursor: pointer; background: #2563eb; color: #fff; border: none; border-radius: 6px; }
    .log { margin-top: 14px; padding: 12px; background: #f8fafc; border: 1px solid #e2e8f0; border-radius: 6px; font-size: 13px; white-space: pre-wrap; }
  </style>
</head>
<body>
  <button type="button" id="send">Send POST</button>
  <div class="log">ajaxStart log:
</div>
  <div id="status" style="margin-top:10px;font-size:14px;color:#64748b;">Click send — global:false skips ajaxStart.</div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $.ajaxSetup({
      url: "https://jsonplaceholder.typicode.com/posts",
      global: false,
      type: "POST",
      dataType: "json"
    });

    $(document).on("ajaxStart", function() {
      $(".log").append("ajaxStart fired\n");
    });

    $("#send").on("click", function() {
      $.ajax({ data: { title: "Setup demo", body: "Posted via defaults", userId: 1 } })
        .done(function(created) {
          $("#status").text("Created post id: " + created.id);
        });
    });
  </script>
</body>
</html>

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jQuery.ajaxSetup() — global:false + POST defaults (Try It)