Update web-platform-tests to revision be5419e845d39089ba6dc338c1bd0fa279108317

tests/wpt/web-platform-tests/tools/wptserve/docs/pipes.rst

@@ -11,6 +11,10 @@ functions are applied to the response from left to right. For example::
 This would serve bytes 1 to 199, inclusive, of foo.txt with the HTTP status
 code 404.
 
+.. note::
+   Pipes are only applied to static files, and will not work if applied to
+   other types of handlers, such as Python File Handlers.
+
 There are several built-in pipe functions, and it is possible to add
 more using the `@pipe` decorator on a function, if required.
 

tests/wpt/web-platform-tests/tools/wptserve/tests/functional/test_pipes.py

@@ -76,5 +76,11 @@ class TestTrickle(TestUsingServer):
         self.assertEqual(resp.read(), expected)
         self.assertGreater(6, t1-t0)
 
+    def test_headers(self):
+        resp = self.request("/document.txt", query="pipe=trickle(d0.01)")
+        self.assertEqual(resp.info()["Cache-Control"], "no-cache, no-store, must-revalidate")
+        self.assertEqual(resp.info()["Pragma"], "no-cache")
+        self.assertEqual(resp.info()["Expires"], "0")
+
 if __name__ == '__main__':
     unittest.main()

tests/wpt/web-platform-tests/tools/wptserve/wptserve/pipes.py

@@ -231,6 +231,13 @@ def trickle(request, response, delays):
     content = resolve_content(response)
     offset = [0]
 
+    if not ("Cache-Control" in response.headers or
+            "Pragma" in response.headers or
+            "Expires" in response.headers):
+        response.headers.set("Cache-Control", "no-cache, no-store, must-revalidate")
+        response.headers.set("Pragma", "no-cache")
+        response.headers.set("Expires", "0")
+
     def add_content(delays, repeat=False):
         for i, (item_type, value) in enumerate(delays):
             if item_type == "bytes":

tests/wpt/web-platform-tests/tools/wptserve/wptserve/server.py

@@ -418,7 +418,8 @@ class WebTestHttpd(object):
 
             _host, self.port = self.httpd.socket.getsockname()
         except Exception:
-            self.logger.error('Init failed! You may need to modify your hosts file. Refer to README.md.')
+            self.logger.error("Failed to start HTTP server. "
+                              "You may need to edit /etc/hosts or similar, see README.md.")
             raise
 
     def start(self, block=False):