Here my handler :
router.HandleFunc("/g/{gparam:.*}", MyHandler)
Bu when i pass something like "123://abc" as param it redirect and modify the param in url to "123:/abc".
is their a way to avoid that ?
It's intended behavior, and is configurable. By default, Gorilla mux will do path cleaning, i.e. removing double slash etc. for new router. You can left the double slash as is by:
router.SkipClean(true)
The SkipClean documentation says:
...
When true, if the route path is "/path//to", it will remain with the double slash. This is helpful if you have a route like:/fetch/http://xkcd.com/534/
Having slash as param, may be your requirement. You need to escape the slashes as %2F.