How to use Go and http.Transport to implement authorization of cross-domain requests?

How to use Go and http.Transport to implement authorization of cross-domain requests?

Cross-domain request refers to the need to send requests to servers with different domain names in the front-end page. Due to browser origin policy restrictions, cross-domain requests are generally not allowed. But in some scenarios, we may need to send cross-domain requests in the back-end server, such as when exchanging data between services. This article will introduce how to use http.Transport of Go language and corresponding authorization to implement cross-domain requests.

First, we need to create a Go HTTP client and configure it using http.Transport. http.Transport provides many options for customization, one of the important options is the authorization settings for cross-origin requests. We can implement authorization by setting the http.Transport method, as shown below:

package main

import (
    "net/http"
    "log"
)

func main() {
    // 创建一个自定义的 http.Transport
    transport := &http.Transport{
        // 增加跨域请求的授权设置
        Proxy: http.ProxyFromEnvironment,
    }

    // 创建一个自定义的 http.Client，使用上面创建的 transport
    client := &http.Client{Transport: transport}

    // 创建一个 GET 请求的实例
    req, err := http.NewRequest("GET", "http://example.com", nil)
    if err != nil {
        log.Fatal(err)
    }

    // 发送请求
    resp, err := client.Do(req)
    if err != nil {
        log.Fatal(err)
    }
    defer resp.Body.Close()

    // 处理响应
    // ...

}

In the above code, we first create a custom http.Transport object and set the Proxy field to http. ProxyFromEnvironment implements authorization of cross-domain requests. This will allow cross-domain requests to be sent to servers with other domain names.

Next, we use this custom http.Transport to create an http.Client object, which will be used to send requests. We can use this object for further request processing and response processing.

Then, we create an instance of the GET request. When creating a request instance, we use the URL to which the request needs to be sent, and an optional request body. In this example, we only sent a GET request, and the request body was empty.

Finally, we use the client.Do(req) method to send the request and process the response. Finally, we must remember to close the response body after the request is complete.

It should be noted that the above example only provides the basic framework for implementing cross-domain request authorization. Specific request processing and corresponding processing need to be customized according to actual needs.

In summary, using Go and http.Transport can easily implement cross-domain request authorization. By setting the Proxy field of http.Transport to http.ProxyFromEnvironment, we can allow the backend server to send cross-domain requests and interact with servers of other domain names. I hope this article was helpful to you, and happy programming!

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