Implement navigator.sendBeacon()

LayoutTests/http/tests/navigation/resources/save-beacon.php

+<?php
+function prettify($name) {
+   return str_replace(' ', '-', ucwords(str_replace('_', ' ', str_replace('http_', '', strtolower($name)))));
+}
+
+$beaconFilename = "beacon" . (isset($_REQUEST['name']) ? $_REQUEST['name'] : "") . ".txt";
+$beaconFile = fopen($beaconFilename . ".tmp", 'w');
+$httpHeaders = $_SERVER;
+ksort($httpHeaders, SORT_STRING);
+$contentType = "";
+foreach ($httpHeaders as $name => $value) {
+    if ($name === "CONTENT_TYPE" || $name === "HTTP_REFERER" || $name === "REQUEST_METHOD" || $name === "HTTP_COOKIE" || $name === "HTTP_ORIGIN") {
+        if ($name === "CONTENT_TYPE") {
+            $contentType = $value;
+            $value = preg_replace('/boundary=.*$/', '', $value);
+        }
+        $headerName = prettify($name);
+        fwrite($beaconFile, "$headerName: $value\n");
+    }
+}
+$postdata = file_get_contents("php://input");
+if (strlen($postdata) == 0)
+   $postdata = http_build_query($_POST);
+
+fwrite($beaconFile, "Length: " . strlen($postdata) . "\n");
+if (strpos($contentType, "application/") !== false) {
+    $postdata = base64_encode($postdata);
+}
+
+fwrite($beaconFile, "Body: $postdata\n");
+fclose($beaconFile);
+rename($beaconFilename . ".tmp", $beaconFilename);
+foreach ($_COOKIE as $name => $value)
+    setcookie($name, "deleted", time() - 60, "/");
+?>