diff --git a/tests/wpt/mozilla/meta/MANIFEST.json b/tests/wpt/mozilla/meta/MANIFEST.json
index 8d999c4271e..0e8c136aa2c 100644
--- a/tests/wpt/mozilla/meta/MANIFEST.json
+++ b/tests/wpt/mozilla/meta/MANIFEST.json
@@ -12495,11 +12495,6 @@
      {}
     ]
    ],
-   "mozilla/resources/http-cache-trickle.py": [
-    [
-     {}
-    ]
-   ],
    "mozilla/resources/http-cache.js": [
     [
      {}
@@ -66395,11 +66390,11 @@
    "testharness"
   ],
   "mozilla/http-cache-xhr.html": [
-   "d4747fdc9ec6acc50718c13a668451987a44d219",
+   "56c44d5100ec2b5a585192e4ec319bb133123c93",
    "testharness"
   ],
   "mozilla/http-cache.html": [
-   "33827dc9bdb0efcbcae4f730086693be315cfc14",
+   "929fdc40e9a193d0ead4c95e2d21d030d27d4bf0",
    "testharness"
   ],
   "mozilla/iframe-unblock-onload.html": [
@@ -72074,12 +72069,8 @@
    "78686147f85e4146e7fc58c1f67a613f65b099a2",
    "support"
   ],
-  "mozilla/resources/http-cache-trickle.py": [
-   "48f4e32ec2e1c1b6d47e89254045b398c1d84d40",
-   "support"
-  ],
   "mozilla/resources/http-cache.js": [
-   "4bf71e1f328e778990eb756741a3be58f4f57ef6",
+   "c6b1ee9def26d4e12a1b93e551c225f82b4717c2",
    "support"
   ],
   "mozilla/resources/iframe_contentDocument_inner.html": [
diff --git a/tests/wpt/mozilla/tests/mozilla/http-cache-xhr.html b/tests/wpt/mozilla/tests/mozilla/http-cache-xhr.html
index 2e1bf9bae7e..fddb89ca081 100644
--- a/tests/wpt/mozilla/tests/mozilla/http-cache-xhr.html
+++ b/tests/wpt/mozilla/tests/mozilla/http-cache-xhr.html
@@ -28,7 +28,7 @@
     ];
     var uuid = token();
     var url = make_url(uuid, requests, 0);
-    url += '&trickle=true';
+    url += '&pipe=trickle(1:d1:r2)';
     client.onprogress = test.step_func(function() {
       var client2 = new XMLHttpRequest();
       client2.onloadend = test.step_func(function(event) {
diff --git a/tests/wpt/mozilla/tests/mozilla/http-cache.html b/tests/wpt/mozilla/tests/mozilla/http-cache.html
index 3254492e89a..c854aa35784 100644
--- a/tests/wpt/mozilla/tests/mozilla/http-cache.html
+++ b/tests/wpt/mozilla/tests/mozilla/http-cache.html
@@ -4,7 +4,6 @@
 <script src="/resources/testharnessreport.js"></script>
 <script src="/common/utils.js"></script>
 <script src="resources/http-cache.js"></script>
-<script src="/fetch/http-cache/resources/http-cache.py"></script>
 <script>
   var tests = [];
   function check_status(status) {
diff --git a/tests/wpt/mozilla/tests/mozilla/resources/http-cache-trickle.py b/tests/wpt/mozilla/tests/mozilla/resources/http-cache-trickle.py
deleted file mode 100644
index e9f5fad1781..00000000000
--- a/tests/wpt/mozilla/tests/mozilla/resources/http-cache-trickle.py
+++ /dev/null
@@ -1,64 +0,0 @@
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
-
-
-import time
-from json import JSONEncoder, JSONDecoder
-from base64 import b64decode
-
-
-def main(request, response):
-    uuid = request.GET.first("token", None)
-    if "querystate" in request.GET:
-        response.headers.set("Content-Type", "text/plain")
-        return JSONEncoder().encode(request.server.stash.take(uuid))
-
-    server_state = request.server.stash.take(uuid)
-    if not server_state:
-        server_state = []
-
-    requests = JSONDecoder().decode(b64decode(request.GET.first("info", "")))
-    config = requests[len(server_state)]
-
-    state = dict()
-    state["request_method"] = request.method
-    state["request_headers"] = dict([[h.lower(), request.headers[h]] for h in request.headers])
-    server_state.append(state)
-    request.server.stash.put(uuid, server_state)
-
-    note_headers = ['content-type', 'access-control-allow-origin', 'last-modified', 'etag']
-    noted_headers = {}
-    for header in config.get('response_headers', []):
-        if header[0].lower() in ["location", "content-location"]:  # magic!
-            header[1] = "%s&target=%s" % (request.url, header[1])
-        response.headers.set(header[0], header[1])
-        if header[0].lower() in note_headers:
-            noted_headers[header[0].lower()] = header[1]
-
-    if "access-control-allow-origin" not in noted_headers:
-        response.headers.set("Access-Control-Allow-Origin", "*")
-    if "content-type" not in noted_headers:
-        response.headers.set("Content-Type", "text/plain")
-    response.headers.set("Server-Request-Count", len(server_state))
-
-    code, phrase = config.get("response_status", [200, "OK"])
-
-    if request.headers.get("If-Modified-Since", False) == noted_headers.get('last-modified', True):
-        code, phrase = [304, "Not Modified"]
-    if request.headers.get("If-None-Match", False) == noted_headers.get('etag', True):
-        code, phrase = [304, "Not Modified"]
-
-    response.status = (code, phrase)
-
-    if request.GET.first("trickle", None):
-        response.write_status_headers()
-        for byte in config.get("response_body", uuid):
-            response.writer.write_content(byte)
-            time.sleep(1)
-
-    content = config.get("response_body", uuid)
-    if code in [204, 304]:
-        return ""
-    else:
-        return content
diff --git a/tests/wpt/mozilla/tests/mozilla/resources/http-cache.js b/tests/wpt/mozilla/tests/mozilla/resources/http-cache.js
index b7f92a93f13..34aaacf536f 100644
--- a/tests/wpt/mozilla/tests/mozilla/resources/http-cache.js
+++ b/tests/wpt/mozilla/tests/mozilla/resources/http-cache.js
@@ -40,11 +40,11 @@ function make_url(uuid, requests, idx) {
   if ("query_arg" in requests[idx]) {
     arg = "&target=" + requests[idx].query_arg;
   }
-  return "resources/http-cache-trickle.py?token=" + uuid + "&info=" + btoa(JSON.stringify(requests)) + arg;
+  return "/fetch/http-cache/resources/http-cache.py?token=" + uuid + "&info=" + btoa(JSON.stringify(requests)) + arg;
 }
 
 function server_state(uuid) {
-  return fetch("resources/http-cache-trickle.py?querystate&token=" + uuid)
+  return fetch("/fetch/http-cache/resources/http-cache.py?querystate&token=" + uuid)
     .then(function(response) {
       return response.text();
     }).then(function(text) {