UI infra: remove cache and accept-encoding temproarily

Disable serving cache until the outage is debugged and fixed.

Change-Id: Iad0ac0d50b10ac08284c95dac2ad15e9f7172a59
diff --git a/infra/ui.perfetto.dev/appengine/main.py b/infra/ui.perfetto.dev/appengine/main.py
index 0fac701..acca00d 100644
--- a/infra/ui.perfetto.dev/appengine/main.py
+++ b/infra/ui.perfetto.dev/appengine/main.py
@@ -19,8 +19,9 @@
 
 REQ_HEADERS = [
     'Accept',
-    'Accept-Encoding',
-    'Cache-Control',
+    # TODO(primiano): re-enable once the gzip handling outage fixed.
+    # 'Accept-Encoding',
+    # 'Cache-Control',
 ]
 
 RESP_HEADERS = [
diff --git a/infra/ui.perfetto.dev/appengine/requirements.txt b/infra/ui.perfetto.dev/appengine/requirements.txt
index 1faca3d..9aa5a27 100644
--- a/infra/ui.perfetto.dev/appengine/requirements.txt
+++ b/infra/ui.perfetto.dev/appengine/requirements.txt
@@ -1,2 +1,3 @@
-Flask==1.1.2
+Flask==2.2.5
+Jinja2==3.0.3
 requests