[Intermittent] “Download update” message redirects to ‘504 Gateway Time-out” page instead of Download page

[data-sync-user]

Important details: 

• this is reproducing intermittently;

• we were unable to reproduce this using the 2.16 version on macOS; 

• reproducing on Production server as well; 

Version / build found in: 

• 2.12;

Reproducible on:

• Windows 10 / 11;

Prerequisites:

• Have a Mx account with an active subscription; 

• Have Mozilla VPN 2.12 installed and opened;

• Be signed in - Stage server;

• Be in Messages screen;

Steps to reproduce:

1. Open the “Download the new Mozilla VPN 2.20” message; 
2. Press the “Download update” button from the message;
3. Observe the behavior;

Expected result:

• The user is redirected to Download page (https://www-dev.allizom.org/en-US/products/vpn/download/ ) 

Actual result:

• The user is redirected to “504 Gateway Time-out” page (https://stage.guardian.nonprod.cloudops.mozgcp.net/vpn/download redirect URL does not change to https://www-dev.allizom.org/en-US/products/vpn/download) 

Notes:

• See the attached ss;

• Used browsers: Firefox, Chrome;

┆Issue is synchronized with this Jira Bug ┆Reporter: Bianca Hidecuti