1 files changed, 27 insertions, 0 deletions
diff --git a/testing/web-platform/tests/element-timing/resources/progressive-image.py b/testing/web-platform/tests/element-timing/resources/progressive-image.py
new file mode 100644
index 0000000000..84e98c8451
--- /dev/null
+++ b/testing/web-platform/tests/element-timing/resources/progressive-image.py
@@ -0,0 +1,27 @@
+import os.path
+import time
+
+from wptserve.utils import isomorphic_encode
+
+def main(request, response):
+    name = request.GET.first(b"name")
+    sleepTime = float(request.GET.first(b"sleep")) / 1E3
+    numInitial = int(request.GET.first(b"numInitial"))
+
+    path = os.path.join(os.path.dirname(isomorphic_encode(__file__)), name)
+    body = open(path, u"rb").read()
+
+    response.headers.set(b"Content-Type", b"image")
+    response.headers.set(b"Content-Length", len(body))
+    response.headers.set(b"Cache-control", b"no-cache, must-revalidate")
+    response.write_status_headers()
+
+    # Read from the beginning, |numInitial| bytes.
+    first = body[:numInitial]
+    response.writer.write_content(first)
+
+    time.sleep(sleepTime)
+
+    # Read the remainder after having slept.
+    second = body[numInitial:]
+    response.writer.write_content(second)