如何在Golang中实现基础的跨域请求处理_Golang跨域请求处理项目实战汇总

func enableCORS(next http.HandlerFunc) http.HandlerFunc {
    return 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, OPTIONS")
        w.Header().Set("Access-Control-Allow-Headers", "Content-Type, Authorization")

        if r.Method == "OPTIONS" {
            w.WriteHeader(http.StatusOK)
            return
        }

        next(w, r)
    }
}

// 使用示例
http.HandleFunc("/api/data", enableCORS(handleData))

import "github.com/gorilla/handlers"

func main() {
    mux := http.NewServeMux()
    mux.HandleFunc("/api/data", handleData)

    // 配置CORS
    corsHandler := handlers.CORS(
        handlers.AllowedOrigins([]string{"http://localhost:3000", "https://yourdomain.com"}),
        handlers.AllowedMethods([]string{"GET", "POST", "PUT", "DELETE", "OPTIONS"}),
        handlers.AllowedHeaders([]string{"X-Requested-With", "Content-Type", "Authorization"}),
    )

    log.Fatal(http.ListenAndServe(":8080", corsHandler(mux)))
}

func CORSMiddleware(allowedOrigin string) func(http.Handler) http.Handler {
    return func(next http.Handler) http.Handler {
        return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
            w.Header().Set("Access-Control-Allow-Origin", allowedOrigin)
            w.Header().Set("Access-Control-Allow-Methods", "GET, POST, PUT, PATCH, DELETE, OPTIONS")
            w.Header().Set("Access-Control-Allow-Headers", "Content-Type, Authorization, X-CSRF-Token")
            w.Header().Set("Access-Control-Expose-Headers", "Content-Length")
            w.Header().Set("Access-Control-Max-Age", "86400")

            if r.Method == "OPTIONS" {
                w.WriteHeader(http.StatusNoContent)
                return
            }

            next.ServeHTTP(w, r)
        })
    }
}

mux.Handle("/api/data", CORSMiddleware("https://example.com")(http.HandlerFunc(handleData)))