golang prohibits cross-domain

As the development of web applications becomes more and more complex, cross-domain problems are becoming more and more common. Cross-domain means that in a browser, a web page cannot directly access resources or data under another domain name. This security restriction is the basic security mechanism of the browser. However, in some cases, it is necessary to allow cross-domain resource sharing between different domain names, because some applications need to obtain resources under other domain names to implement functions. As an emerging language, golang's built-in http package also provides support for cross-domain resource sharing. This article will discuss how to implement cross-domain resource sharing in golang and introduce how to prohibit cross-domain.

1. Golang implements cross-domain resource sharing

golang provides response header settings and supports cross-domain resource sharing. You can share a resource to other domain names by setting the Access-Control-Allow-Origin response header to specify the domain names that are allowed to be accessed.

The following is a simple example:

package main

import (
    "fmt"
    "net/http"
)

func main() {
    http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
        w.Header().Set("Access-Control-Allow-Origin", "*") // 通过设置 Access-Control-Allow-Origin 响应头来支持跨域资源共享
        w.WriteHeader(http.StatusOK)
        fmt.Fprintf(w, "Hello, %s!", r.URL.Path[1:])
    })
    http.ListenAndServe(":8080", nil)
}

In the above example, the Access-Control-Allow-Origin response header is set to , indicating that access from any domain name is allowed. If you only want to allow access to a specific domain name, you can replace with the corresponding domain name, which can control cross-domain resource sharing more securely.

2. Prohibit cross-domain

Sometimes we need to prohibit cross-domain when developing web applications in order to protect user information security. In golang, we can disable cross-domain by setting response headers. The following is a simple example:

package main

import (
    "fmt"
    "net/http"
)

func main() {
    http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
        w.Header().Set("Access-Control-Allow-Origin", "") // 设置 Access-Control-Allow-Origin 响应头为空，表示禁止跨域
        w.WriteHeader(http.StatusOK)
        fmt.Fprintf(w, "Hello, %s!", r.URL.Path[1:])
    })
    http.ListenAndServe(":8080", nil)
}

In the above code, we set the Access-Control-Allow-Origin response header to empty, thus prohibiting access from any domain name.

3. Summary

This article introduces how to implement cross-domain resource sharing in golang and demonstrates how to prohibit cross-domain. In actual development, the choice of whether to allow cross-domain needs to be decided based on specific business needs and security considerations. In order to protect the security of user information, it is a common practice to prohibit cross-domain transactions. However, in some cases it is necessary to allow cross-domain because some applications need to obtain resources under other domain names to implement functions.

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