How to set up proxy in golang

When using golang to make network requests, sometimes you need to access the target website through a proxy. Below we introduce how to set up a proxy in golang.

1. Use http proxy

Use http proxy to automatically use the proxy when accessing http requests. The code is as follows:

func main() {
    proxyUrl, _ := url.Parse("http://127.0.0.1:8080")
    client := &http.Client{
        Transport: &http.Transport{
            Proxy: http.ProxyURL(proxyUrl),
        },
    }
    resp, err := client.Get("http://www.baidu.com")
    if err != nil {
        fmt.Println(err)
        return
    }
    defer resp.Body.Close()
    body, err := ioutil.ReadAll(resp.Body)
    if err != nil {
        fmt.Println(err)
        return
    }
    fmt.Println(string(body))
}

wherehttp. ProxyURL(proxyUrl) can specify the proxy address, client.Get() can initiate a network request.

2. Use http and https proxy

If you need to access http and https requests at the same time, you can use the following code:

func main() {
    proxyUrl, _ := url.Parse("http://127.0.0.1:8080")
    client := &http.Client{
        Transport: &http.Transport{
            Proxy: http.ProxyURL(proxyUrl),
            TLSClientConfig: &tls.Config{
                InsecureSkipVerify: true,
            },
        },
    }
    resp, err := client.Get("https://www.baidu.com")
    if err != nil {
        fmt.Println(err)
        return
    }
    defer resp.Body.Close()
    body, err := ioutil.ReadAll(resp.Body)
    if err != nil {
        fmt.Println(err)
        return
    }
    fmt.Println(string(body))
}

whereInsecureSkipVerifyParameter is used to skip https certificate verification.

3. Use socks5 proxy

There are many advantages to using socks5 proxy, including better security and anonymity. The code is as follows:

func main() {
    dialer, err := proxy.SOCKS5("tcp", "127.0.0.1:1080", nil, proxy.Direct)
    if err != nil {
        fmt.Println(err)
        return
    }
    httpClient := &http.Client{Transport: &http.Transport{Dial: dialer.Dial}}
    resp, err := httpClient.Get("http://www.google.com")
    if err != nil {
        fmt.Println(err)
        return
    }
    defer resp.Body.Close()
    body, err := ioutil.ReadAll(resp.Body)
    if err != nil {
        fmt.Println(err)
        return
    }
    fmt.Println(string(body))
}

Among them, proxy.SOCKS5 can specify the socks5 proxy address, and httpClient.Get() can initiate a network request.

Setting up agents is also an important part of network programming. After learning, you can better deal with actual situations.

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