1 files changed, 38 insertions, 0 deletions
diff --git a/testing/web-platform/tests/fetch/api/basic/conditional-get.any.js b/testing/web-platform/tests/fetch/api/basic/conditional-get.any.js
new file mode 100644
index 0000000000..2f9fa81c02
--- /dev/null
+++ b/testing/web-platform/tests/fetch/api/basic/conditional-get.any.js
@@ -0,0 +1,38 @@
+// META: title=Request ETag
+// META: global=window,worker
+// META: script=/common/utils.js
+
+promise_test(function() {
+  var cacheBuster = token(); // ensures first request is uncached
+  var url = "../resources/cache.py?v=" + cacheBuster;
+  var etag;
+
+  // make the first request
+  return fetch(url).then(function(response) {
+    // ensure we're getting the regular, uncached response
+    assert_equals(response.status, 200);
+    assert_equals(response.headers.get("X-HTTP-STATUS"), null)
+
+    return response.text(); // consuming the body, just to be safe
+  }).then(function(body) {
+    // make a second request
+    return fetch(url);
+  }).then(function(response) {
+    // while the server responds with 304 if our browser sent the correct
+    // If-None-Match request header, at the JavaScript level this surfaces
+    // as 200
+    assert_equals(response.status, 200);
+    assert_equals(response.headers.get("X-HTTP-STATUS"), "304")
+
+    etag = response.headers.get("ETag")
+
+    return response.text(); // consuming the body, just to be safe
+  }).then(function(body) {
+    // make a third request, explicitly setting If-None-Match request header
+    var headers = { "If-None-Match": etag }
+    return fetch(url, { headers: headers })
+  }).then(function(response) {
+    // 304 now surfaces thanks to the explicit If-None-Match request header
+    assert_equals(response.status, 304);
+  });
+}, "Testing conditional GET with ETags");