Endless loop if use prefix path with ROOT_URL

Description:

I running Rocket Chat with a prefix path like https://localhost:4000/test and get the error that makes an endless request and freeze my browser.

I had dig into the problem and I found that if I define prefix path, a request to /api/ecdh_proxy/initEncrptedSession on frontend will get 404 Not Found (prefix path not apply to it) that makes an endless request to /api/v1/method.callAnon/getSetupWizardParameters

Steps to reproduce:

1. Get docker-compose file from https://github.com/RocketChat/Rocket.Chat/blob/develop/docker-compose.yml
2. Change ROOT_URL to http://localhost:3000/test
3. Run and open rocketchat URL

Expected behavior:

• Normal setup wizard page (a request to /api/v1/method.callAnon/getSetupWizardParameters successfully)
• Add prefix to /api/ecdh_proxy/initEncrptedSession to prevent the endless request

Actual behavior:

Server Setup Information:

• Version of Rocket.Chat Server: 3.14.0
• Deployment Method: Docker Image
• MongoDB Version: 4.2.14

Client Setup Information

• Browser: Google Chrome Version 90.0.4430.212 (Official Build) (64-bit)
• Operating System: Windows 10 64-bit

Start with the docker-compose.yml setup and reproduce using ROOT_URL set to http://localhost:3000/test. Inspect how the frontend requests /api/ecdh_proxy/initEncrptedSession and /api/v1/method.callAnon/getSetupWizardParameters when a prefix path is configured. Done means the setup wizard loads normally and the encrypted-session request includes the prefix without an endless request loop.