How to download and setup rack-defense
Open terminal and run command
                                            git clone https://github.com/nakhli/rack-defense.git
                                        
                                        git clone is used to create a copy or clone of rack-defense 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 rack-defense https://github.com/nakhli/rack-defense/archive/master.zip
Or simply clone rack-defense with SSH
                                            [email protected]:nakhli/rack-defense.git                                    
                                    If you have some problems with rack-defense
You may open issue on rack-defense support forum (system) here: https://github.com/nakhli/rack-defense/issuesSimilar to rack-defense repositories
Here you may see rack-defense alternatives and analogs
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