chromium/third_party/blink/web_tests/http/tests/inspector-protocol/network/resources/set-cookie-name-value-pair-exceeds-max-size.php

<?php
// Set a cookie that's 4097 characters, which is one more than the maximum
// for name + value pairs (as specified by RFC6265bis).
header("set-cookie: " . str_repeat('a', 4097));
?>