Implement a single player mode (fake host mode) for WebGL

Is your feature request related to a problem? Please describe.
I want to have the ability to implement single player mode for WebGL, but host mode is not available there

Describe the solution you'd like
I want to have a solution that allows me to create fake host mode out of the box, without internet connection to use it for singleplayer mode for all platforms, especially for webgl. It is needed to have 1 client/server implementation for singleplayer and multiplayer games.

Describe alternatives you've considered
To create a custom Transport without internet connection. Or maybe to make host mode for webgl that uses other driver inside current Unity Transport

Comece revisando o Unity Transport atual e a limitação do modo host do WebGL descrita na issue. Compare o modo fake host proposto com um Transport offline personalizado e, em seguida, defina como uma única implementação de cliente/servidor deve funcionar tanto para single-player quanto para multiplayer sem uma conexão com a Internet. O trabalho estará concluído quando houver um design acordado e um modo host single-player funcional para WebGL e outras plataformas.