A util package collection.
For more information, goto godoc https://godoc.org/github.com/mnhkahn/gogogo/util
Chinese details, goto http://blog.cyeam.com//golang/2018/08/27/retry?utm_source=github
Goroutine returns app detail, including numbers of goroutines, threads, CPU and GOMAXPROCS.
HttpJson sends a http request and unmarshal json response to v to return.
HttpXml sends a http request and unmarshal xml response to v to return.
Retry function. fn is the retry function.