reactor
                                The reactive-stack web framework, Spring WebFlux, was added later in version Spring 5.0
                            
                        How to download and setup reactor
Open terminal and run command
                                            git clone https://github.com/jd268/reactor.git
                                        
                                        git clone is used to create a copy or clone of reactor 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 reactor https://github.com/jd268/reactor/archive/master.zip
Or simply clone reactor with SSH
                                            [email protected]:jd268/reactor.git                                    
                                    If you have some problems with reactor
You may open issue on reactor support forum (system) here: https://github.com/jd268/reactor/issuesSimilar to reactor repositories
Here you may see reactor alternatives and analogs
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