1 files changed, 110 insertions, 0 deletions
diff --git a/docshell/test/mochitest/file_bug1747033.sjs b/docshell/test/mochitest/file_bug1747033.sjs
new file mode 100644
index 0000000000..14401101b2
--- /dev/null
+++ b/docshell/test/mochitest/file_bug1747033.sjs
@@ -0,0 +1,110 @@
+"use strict";
+
+const BOUNDARY = "BOUNDARY";
+
+// waitForPageShow should be false if this is for multipart/x-mixed-replace
+// and it's not the last part, Gecko doesn't fire pageshow for those parts.
+function documentString(waitForPageShow = true) {
+  return `<html>
+  <head>
+    <script>
+      let bc = new BroadcastChannel("bug1747033");
+      bc.addEventListener("message", ({ data: { cmd, arg = undefined } }) => {
+        switch (cmd) {
+          case "load":
+            location.href = arg;
+            break;
+          case "replaceState":
+            history.replaceState({}, "Replaced state", arg);
+            bc.postMessage({ "historyLength": history.length, "location": location.href });
+            break;
+          case "back":
+            history.back();
+            break;
+          case "close":
+            close();
+            break;
+          }
+      });
+
+      function reply() {
+        bc.postMessage({ "historyLength": history.length, "location": location.href });
+      }
+
+      ${waitForPageShow ? `addEventListener("pageshow", reply);` : "reply();"}
+    </script>
+  </head>
+  <body></body>
+</html>
+`;
+}
+
+function boundary(last = false) {
+  let b = `--${BOUNDARY}`;
+  if (last) {
+    b += "--";
+  }
+  return b + "\n";
+}
+
+function sendMultipart(response, last = false) {
+  setState("sendMore", "");
+
+  response.write(`Content-Type: text/html
+
+${documentString(last)}
+`);
+  response.write(boundary(last));
+}
+
+function shouldSendMore() {
+  return new Promise(resolve => {
+    let timer = Cc["@mozilla.org/timer;1"].createInstance(Ci.nsITimer);
+    timer.initWithCallback(
+      () => {
+        let sendMore = getState("sendMore");
+        if (sendMore !== "") {
+          timer.cancel();
+          resolve(sendMore);
+        }
+      },
+      100,
+      Ci.nsITimer.TYPE_REPEATING_SLACK
+    );
+  });
+}
+
+async function handleRequest(request, response) {
+  if (request.queryString == "") {
+    // This is for non-multipart/x-mixed-replace loads.
+    response.write(documentString());
+    return;
+  }
+
+  if (request.queryString == "sendNextPart") {
+    setState("sendMore", "next");
+    return;
+  }
+
+  if (request.queryString == "sendLastPart") {
+    setState("sendMore", "last");
+    return;
+  }
+
+  response.processAsync();
+
+  response.setHeader(
+    "Content-Type",
+    `multipart/x-mixed-replace; boundary=${BOUNDARY}`,
+    false
+  );
+  response.setStatusLine(request.httpVersion, 200, "OK");
+
+  response.write(boundary());
+  sendMultipart(response);
+  while ((await shouldSendMore("sendMore")) !== "last") {
+    sendMultipart(response);
+  }
+  sendMultipart(response, true);
+  response.finish();
+}