How to download and setup websocket-server
Open terminal and run command
                                            git clone https://github.com/amphp/websocket-server.git
                                        
                                        git clone is used to create a copy or clone of websocket-server repositories.
                                        You pass git clone a repository URL. it supports a few different network protocols and corresponding URL formats.
Also you may download zip file with websocket-server https://github.com/amphp/websocket-server/archive/master.zip
Or simply clone websocket-server with SSH
                                            [email protected]:amphp/websocket-server.git                                    
                                    If you have some problems with websocket-server
You may open issue on websocket-server support forum (system) here: https://github.com/amphp/websocket-server/issuesSimilar to websocket-server repositories
Here you may see websocket-server alternatives and analogs
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