diff --git a/r/testsrv.py b/r/testsrv.py
new file mode 100644
index 0000000..e693c11
--- /dev/null
+++ b/r/testsrv.py
@@ -0,0 +1,15 @@
+import http.server
+
+class MyHTTPRequestHandler(http.server.SimpleHTTPRequestHandler):
+    def end_headers(self):
+        self.send_my_headers()
+        http.server.SimpleHTTPRequestHandler.end_headers(self)
+
+    def send_my_headers(self):
+        self.send_header("Cache-Control", "no-cache, no-store, must-revalidate")
+        self.send_header("Pragma", "no-cache")
+        self.send_header("Expires", "0")
+
+
+if __name__ == '__main__':
+    http.server.test(HandlerClass=MyHTTPRequestHandler)