go - Preflight issue with http POST in golang -

i using mux package , have code:

func saveconfig(w http.responsewriter, r *http.request) {     if origin := r.header.get("origin"); origin != "" {         w.header().set("access-control-allow-origin", origin)         fmt.println("origin: " + origin)         w.header().set("access-control-allow-methods", "post, get, options, put, delete")         w.header().set("access-control-allow-headers", "accept, content-type, content-length, accept-encoding, x-csrf-token, authorization")     }     // stop here if preflighted options request     if r.method == "options" {         return     }      body, err := ioutil.readall(io.limitreader(r.body, 1048576))     if err != nil {         fmt.println("error: %s\n", err)         w.writeheader(http.statusinternalservererror)         return     }      fmt.println("json body:" + string(body))     if err := r.body.close(); err != nil {         panic(err)     }      w.writeheader(http.statuscreated) } 

it's working fine on ie chrome preflight sending options method , getting 404 response back. appreciated.

the code registers post, not options. 1 approach change code following:

func newrouter() *mux.router {      router := mux.newrouter().strictslash(true)      _, route := range routes {          var handler http.handler          handler = route.handlerfunc         handler = commonlibrary.logger(handler, route.name)          return router.methods(route.method, "options").path(route.pattern).name(route.name).handler(handler)  } 

this add options handlers. approach change route method field methods []string , create router as:

return router.methods(route.methods..., "options").path(route.pattern).name(route.name).handler(handler) 

this allow add options subset of handlers.

yet approach register separate handler options:

 route{"saveconfig", "options", "/saveconfig", preflight}