1 files changed, 92 insertions, 0 deletions
diff --git a/netwerk/test/unit/test_304_responses.js b/netwerk/test/unit/test_304_responses.js
new file mode 100644
index 0000000000..a468eec191
--- /dev/null
+++ b/netwerk/test/unit/test_304_responses.js
@@ -0,0 +1,92 @@
+"use strict";
+// https://bugzilla.mozilla.org/show_bug.cgi?id=761228
+
+const { HttpServer } = ChromeUtils.importESModule(
+  "resource://testing-common/httpd.sys.mjs"
+);
+
+ChromeUtils.defineLazyGetter(this, "URL", function () {
+  return "http://localhost:" + httpServer.identity.primaryPort;
+});
+
+var httpServer = null;
+const testFileName = "test_customConditionalRequest_304";
+const basePath = "/" + testFileName + "/";
+
+ChromeUtils.defineLazyGetter(this, "baseURI", function () {
+  return URL + basePath;
+});
+
+const unexpected304 = "unexpected304";
+const existingCached304 = "existingCached304";
+
+function make_channel(url) {
+  return NetUtil.newChannel({
+    uri: url,
+    loadUsingSystemPrincipal: true,
+  }).QueryInterface(Ci.nsIHttpChannel);
+}
+
+function alwaysReturn304Handler(metadata, response) {
+  response.setStatusLine(metadata.httpVersion, 304, "Not Modified");
+  response.setHeader("Returned-From-Handler", "1");
+}
+
+function run_test() {
+  evict_cache_entries();
+
+  httpServer = new HttpServer();
+  httpServer.registerPathHandler(
+    basePath + unexpected304,
+    alwaysReturn304Handler
+  );
+  httpServer.registerPathHandler(
+    basePath + existingCached304,
+    alwaysReturn304Handler
+  );
+  httpServer.start(-1);
+  run_next_test();
+}
+
+function consume304(request, buffer) {
+  request.QueryInterface(Ci.nsIHttpChannel);
+  Assert.equal(request.responseStatus, 304);
+  Assert.equal(request.getResponseHeader("Returned-From-Handler"), "1");
+  run_next_test();
+}
+
+// Test that we return a 304 response to the caller when we are not expecting
+// a 304 response (i.e. when the server shouldn't have sent us one).
+add_test(function test_unexpected_304() {
+  var chan = make_channel(baseURI + unexpected304);
+  chan.asyncOpen(new ChannelListener(consume304, null));
+});
+
+// Test that we can cope with a 304 response that was (erroneously) stored in
+// the cache.
+add_test(function test_304_stored_in_cache() {
+  asyncOpenCacheEntry(
+    baseURI + existingCached304,
+    "disk",
+    Ci.nsICacheStorage.OPEN_NORMALLY,
+    null,
+    function (entryStatus, cacheEntry) {
+      cacheEntry.setMetaDataElement("request-method", "GET");
+      cacheEntry.setMetaDataElement(
+        "response-head",
+        // eslint-disable-next-line no-useless-concat
+        "HTTP/1.1 304 Not Modified\r\n" + "\r\n"
+      );
+      cacheEntry.metaDataReady();
+      cacheEntry.close();
+
+      var chan = make_channel(baseURI + existingCached304);
+
+      // make it a custom conditional request
+      chan.QueryInterface(Ci.nsIHttpChannel);
+      chan.setRequestHeader("If-None-Match", '"foo"', false);
+
+      chan.asyncOpen(new ChannelListener(consume304, null));
+    }
+  );
+});