https://cderv.r-universe.dev/proxyconfighttps://cderv.r-universe.dev/api/packages/proxyconfighttps://cderv.r-universe.dev/proxyconfig/proxyconfig.pdfhttps://cderv.r-universe.dev/proxyconfig/doc/manual.htmlhttps://cderv.r-universe.dev/proxyconfig/citationhttps://cderv.r-universe.dev/proxyconfig/citation.txthttps://cderv.r-universe.dev/proxyconfig/citation.cff