Cross-domain request processing in Go language framework
Jun 03, 2023 am 08:32 AM
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:
- 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.
- 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.
- 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:
- 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.
- 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中間件
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()
// 配置跨域請求信息
c := cors.New(cors.Options{
AllowedOrigins: []string{"*"},
AllowedMethods: []string{"GET", "POST", "PUT", "DELETE", "OPTIONS"},
AllowCredentials: true,
AllowedHeaders: []string{"Authorization", "Content-Type"},
})
// 將cors中間件添加到路由器中
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.
The above is the detailed content of Cross-domain request processing in Go language framework. For more information, please follow other related articles on the PHP Chinese website!
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