Cross-domain request processing in Go language framework

In web development, cross-domain requests are a common requirement. If a website needs to obtain data from another domain or call an API interface, it needs to use cross-domain requests. However, in order to ensure the security of the website, the browser will block such requests, causing cross-domain requests to fail. In order to solve this problem, we need to use some technical means to handle cross-domain requests. In this article, we will introduce the cross-domain request processing method in the Go language framework.

What is a cross-domain request?

In Web development, front-end pages under the same domain name can freely access the back-end interface under the same domain name. However, if the front-end page needs to call an interface under another domain name or obtain data under that domain name, it needs to use a cross-domain request.

The essence of cross-domain requests is to send the request for the front-end page to the back-end server, and then receive the data returned from the server. However, due to browser security mechanisms, requests between different domain names are prohibited. This will cause a "same origin policy" problem, where the browser prohibits data communication between different sources.

Methods to solve cross-domain requests

In order to solve the problem of cross-domain requests, we can use the following methods:

1. JSONP

JSONP is a simple cross-domain request method. It introduces an external JavaScript file through the script tag during the request, and the file will return the request result to the front-end page in the form of a callback function. The implementation of JSONP is simple, but it only supports GET request method and has certain security risks.

2. CORS

CORS (Cross-Origin Resource Sharing) is the cross-domain request method recommended in the HTML5 standard, by setting the Access-Control-Allow-Origin response header. Allow requests under the specified domain name to pass. CORS can set multiple request headers, supports all HTTP request methods, and is more secure than JSONP.

3. Proxy

The proxy method is to configure a proxy server on the server side, and then send the request to the proxy server when the front end sends a request, and the proxy server continues to the target The server sends a request and returns a response. The proxy method can solve the problem of cross-domain requests, but it requires additional server overhead and may cause additional network delays.

How to handle cross-domain requests in the Go language framework?

There are many third-party libraries in the Go language framework that can be used to handle cross-domain requests. This article introduces the following two types:

1. gin-cors

gin -cors is a CORS middleware library based on the Gin framework that can easily handle cross-domain requests. Use gin-cors to quickly set request header information such as Access-Control-Allow-Origin, Access-Control-Allow-Methods, Access-Control-Allow-Headers, etc.

2. cors

cors is a CORS middleware library that supports Go language, which can easily add CORS support to HTTP servers written in Golang. cors can configure request header information such as Access-Control-Allow-Origin, Access-Control-Allow-Methods, Access-Control-Allow-Credentials, etc.

The following is an example of the use of gin-cors:

package main

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

func main() {
    router := gin.Default()

    // 使用cors中间件
    router.Use(cors.Default())

    // 路由
    router.GET("/hello", func(c *gin.Context) {
        c.JSON(200, gin.H{
            "message": "hello world",
        })
    })

    router.Run(":8080")
}

The following is an example of the use of cors:

package main

import "github.com/go-sql-driver/mysql"
import "github.com/rs/cors"
import "github.com/gorilla/mux"

func main() {
    r := mux.NewRouter()

    // 配置跨域请求信息
    c := cors.New(cors.Options{
        AllowedOrigins: []string{"*"},
        AllowedMethods: []string{"GET", "POST", "PUT", "DELETE", "OPTIONS"},
        AllowCredentials: true,
        AllowedHeaders: []string{"Authorization", "Content-Type"},
    })

    // 将cors中间件添加到路由器中
    handler := c.Handler(r)

    // 路由
    r.HandleFunc("/hello", func(w http.ResponseWriter, r *http.Request) {
        fmt.Fprintf(w, "Hello World")
    }).Methods("GET")

    http.ListenAndServe(":8080", handler)
}

Conclusion

Cross-domain requests are in Web development A common problem, there are many third-party libraries in the Go language framework that can be used to solve this problem. By using gin-cors or cors middleware library, we can easily add cross-domain request support to our web applications.

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