Golang 实现跨域请求的多种实现对比

func CORS(c *gin.Context) {
	c.Writer.Header().Set("Access-Control-Allow-Origin", "*")
	c.Writer.Header().Set("Access-Control-Allow-Credentials", "true")
	c.Writer.Header().Set("Access-Control-Allow-Headers", "Content-Type, Content-Length, Accept-Encoding, X-CSRF-Token, Authorization, accept, origin, Cache-Control, X-Requested-With")
	c.Writer.Header().Set("Access-Control-Allow-Methods", "POST, OPTIONS, GET, PUT, DELETE")

	if c.Request.Method == "OPTIONS" {
		c.AbortWithStatus(http.StatusNoContent)
		return
	}

	c.Next()
}  

func main() {  
	r := gin.Default()  
	r.Use(CORS)  
  
	r.GET("/ping", func(c *gin.Context) {  
		c.JSON(200, gin.H{  
			"message": "pong",  
		})  
	})  
  
	r.Run(":8080")  
}  

package main

import (
    "net/http"
    "github.com/rs/cors"
)

func main() {
    mux := http.NewServeMux()
    mux.HandleFunc("/api", func(w http.ResponseWriter, r *http.Request) {
        w.Write([]byte("Hello, CORS!"))
    })

    // 配置 CORS
    c := cors.New(cors.Options{
        AllowedOrigins:   ["https://example.com", "http://localhost:3000"],
        AllowedMethods:   ["GET", "POST", "PUT", "DELETE"],
        AllowedHeaders:   ["Content-Type", "Authorization"],
        AllowCredentials: true,
        Debug:            false,
    })

    handler := c.Handler(mux)
    http.ListenAndServe(":8080", handler)
}

package main

import (
    "github.com/gin-contrib/cors"
    "github.com/gin-gonic/gin"
)

func main() {
    r := gin.Default()
    
    // 配置 CORS 中间件
    r.Use(cors.New(cors.Config{
        AllowOrigins:     ["https://example.com"],
        AllowMethods:     ["GET", "POST"],
        AllowHeaders:     ["Content-Type"],
        ExposeHeaders:    ["Content-Length"],
        AllowCredentials: true,
        MaxAge: 12 * time.Hour,
    }))
    
    r.GET("/api", func(c *gin.Context) {
        c.String(200, "Hello, CORS!")
    })
    
    r.Run(":8080")
}

location /api {
    add_header 'Access-Control-Allow-Origin' 'https://example.com';
    add_header 'Access-Control-Allow-Methods' 'GET, POST';
    add_header 'Access-Control-Allow-Headers' 'Content-Type, Authorization';
    
    if ($request_method = OPTIONS) {
        return 204;
    }
    
    proxy_pass http://localhost:8080;
}