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diff --git a/dom/security/test/csp/test_upgrade_insecure.html b/dom/security/test/csp/test_upgrade_insecure.html
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+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>Bug 1139297 - Implement CSP upgrade-insecure-requests directive</title>
+  <!-- Including SimpleTest.js so we can use waitForExplicitFinish !-->
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<iframe style="width:100%;" id="testframe"></iframe>
+
+<script class="testbody" type="text/javascript">
+
+/* Description of the test:
+ * We load resources (img, script, sytle, etc) over *http* and make sure
+ * that all the resources get upgraded to use  >> https << when the
+ * csp-directive "upgrade-insecure-requests" is specified. We further
+ * test that subresources within nested contexts (iframes) get upgraded
+ * and also test the handling of server side redirects.
+ *
+ * In detail:
+ * We perform an XHR request to the *.sjs file which is processed async on
+ * the server and waits till all the requests were processed by the server.
+ * Once the server received all the different requests, the server responds
+ * to the initial XHR request with an array of results which must match
+ * the expected results from each test, making sure that all requests
+ * received by the server (*.sjs) were actually *https* requests.
+ */
+
+const { AppConstants } = SpecialPowers.ChromeUtils.importESModule(
+  "resource://gre/modules/AppConstants.sys.mjs"
+);
+
+const UPGRADE_POLICY =
+  "upgrade-insecure-requests;" +               // upgrade all http requests to https
+  "block-all-mixed-content;" +                 // upgrade should be enforced before block-all.
+  "default-src https: wss: 'unsafe-inline';" + // only allow https: and wss:
+  "form-action https:;";                       // explicit, no fallback to default-src
+
+const UPGRADE_POLICY_NO_DEFAULT_SRC =
+  "upgrade-insecure-requests;" +               // upgrade all http requests to https
+  "script-src 'unsafe-inline' *";              // we have to allowlist the inline scripts
+                                               // in the test.
+const NO_UPGRADE_POLICY =
+  "default-src http: ws: 'unsafe-inline';" +   // allow http:// and ws://
+  "form-action http:;";                        // explicit, no fallback to default-src
+
+var tests = [
+  { // (1) test that all requests within an >> https << page get updated
+    policy: UPGRADE_POLICY,
+    topLevelScheme: "https://",
+    description: "upgrade all requests on toplevel https",
+    deliveryMethod: "header",
+    results: [
+      "iframe-ok", "script-ok", "img-ok", "img-redir-ok", "font-ok", "xhr-ok", "style-ok",
+      "media-ok", "object-ok", "form-ok", "nested-img-ok"
+    ]
+  },
+  { // (2) test that all requests within an >> http << page get updated
+    policy: UPGRADE_POLICY,
+    topLevelScheme: "http://",
+    description: "upgrade all requests on toplevel http",
+    deliveryMethod: "header",
+    results: [
+      "iframe-ok", "script-ok", "img-ok", "img-redir-ok", "font-ok", "xhr-ok", "style-ok",
+      "media-ok", "object-ok", "form-ok", "nested-img-ok"
+    ]
+  },
+  { // (3) test that all requests within an >> http << page get updated, but do
+    //     not specify a default-src directive.
+    policy: UPGRADE_POLICY_NO_DEFAULT_SRC,
+    topLevelScheme: "http://",
+    description: "upgrade all requests on toplevel http where default-src is not specified",
+    deliveryMethod: "header",
+    results: [
+      "iframe-ok", "script-ok", "img-ok", "img-redir-ok", "font-ok", "xhr-ok", "style-ok",
+      "media-ok", "object-ok", "form-ok", "nested-img-ok"
+    ]
+  },
+  { // (4) test that no requests get updated if >> upgrade-insecure-requests << is not used
+    policy: NO_UPGRADE_POLICY,
+    topLevelScheme: "http://",
+    description: "do not upgrade any requests on toplevel http",
+    deliveryMethod: "header",
+    results: [
+      "iframe-error", "script-error", "img-error", "img-redir-error", "font-error",
+      "xhr-error", "style-error", "media-error", "object-error", "form-error",
+      "nested-img-error"
+    ]
+  },
+  { // (5) test that all requests within an >> https << page using meta CSP get updated
+    // policy: UPGRADE_POLICY, that test uses UPGRADE_POLICY within
+    //                         file_upgrade_insecure_meta.html
+    //                         no need to define it within that object.
+    topLevelScheme: "https://",
+    description: "upgrade all requests on toplevel https using meta csp",
+    deliveryMethod: "meta",
+    results: [
+      "iframe-ok", "script-ok", "img-ok", "img-redir-ok", "font-ok", "xhr-ok", "style-ok",
+      "media-ok", "object-ok", "form-ok", "nested-img-ok"
+    ]
+  },
+];
+
+// TODO: WebSocket tests are not supported on Android Yet. Bug 1566168.
+if (AppConstants.platform !== "android") {
+    for (let test of tests) {
+        test.results.push(test.results[0] == "iframe-ok" ? "websocket-ok" : "websocket-error");
+    }
+}
+
+var counter = 0;
+var curTest;
+
+function loadTestPage() {
+  curTest = tests[counter++];
+  var src = curTest.topLevelScheme + "example.com/tests/dom/security/test/csp/file_testserver.sjs?file=";
+  if (curTest.deliveryMethod === "header") {
+    // append the file that should be served
+    src += escape("tests/dom/security/test/csp/file_upgrade_insecure.html");
+    // append the CSP that should be used to serve the file
+    src += "&csp=" + escape(curTest.policy);
+  }
+  else {
+    src += escape("tests/dom/security/test/csp/file_upgrade_insecure_meta.html");
+    // no csp here, since it's in the meta element
+  }
+  document.getElementById("testframe").src = src;
+}
+
+function finishTest() {
+  window.removeEventListener("message", receiveMessage);
+  SimpleTest.finish();
+}
+
+function checkResults(result) {
+    // try to find the expected result within the results array
+  var index = curTest.results.indexOf(result);
+  isnot(index, -1, curTest.description + " (result: " + result + ")");
+
+  // take the element out the array and continue till the results array is empty
+  if (index != -1) {
+    curTest.results.splice(index, 1);
+  }
+  // lets check if we are expecting more results to bubble up
+  if (curTest.results.length) {
+    return;
+  }
+  // lets see if we ran all the tests
+  if (counter == tests.length) {
+    finishTest();
+    return;
+  }
+  // otherwise it's time to run the next test
+  runNextTest();
+}
+
+// a postMessage handler that is used by sandboxed iframes without
+// 'allow-same-origin' to bubble up results back to this main page.
+window.addEventListener("message", receiveMessage);
+function receiveMessage(event) {
+  checkResults(event.data.result);
+}
+
+function runNextTest() {
+  // sends an xhr request to the server which is processed async, which only
+  // returns after the server has received all the expected requests.
+  var myXHR = new XMLHttpRequest();
+  myXHR.open("GET", "file_upgrade_insecure_server.sjs?queryresult");
+  myXHR.onload = function(e) {
+    var results = myXHR.responseText.split(",");
+    for (var index in results) {
+      checkResults(results[index]);
+    }
+  }
+  myXHR.onerror = function(e) {
+    ok(false, "could not query results from server (" + e.message + ")");
+    finishTest();
+  }
+  myXHR.send();
+
+  // give it some time and run the testpage
+  SimpleTest.executeSoon(loadTestPage);
+}
+
+SimpleTest.waitForExplicitFinish();
+runNextTest();
+
+</script>
+</body>
+</html>