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How to set up the web proxy?
In "Preference" - "General", you can set different proxy parameters.
In addition to the system proxy, also can choose HTTP, HTTPS and PAC proxy settings.

Web Proxy
Proxy Settings for Launcher Login Page
The launcher login page provides an entry for proxy settings
In a restricted network environment (such as enterprise intranet, campus network, etc.), you can directly configure proxy server information before logging in to complete the login, without first entering the Render and then setting up the proxy.