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