CORS

func corsMiddleware(next http.Handler) http.Handler {
    return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
        w.Header().Set("Access-Control-Allow-Origin", "*")
        w.Header().Set("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE")
        w.Header().Set("Access-Control-Allow-Headers", "Content-Type")
        next.ServeHTTP(w, r)
    })
}

in the router:

r.Use(corsMiddleware)

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