How to Customize the Source IP Address for HTTP Requests in Go?

Customizing IP Source for HTTP Requests

In situations where you prefer to avoid using your primary IP address for HTTP requests, Go provides a way to specify the source address.

To achieve this, you can create a custom Dialer within the client's Transport. This is accomplished as follows:

// Create a transport based on http.DefaultTransport, but with a custom localAddr
transport := &http.Transport{
    Proxy: http.ProxyFromEnvironment,
    DialContext: (&net.Dialer{
        Timeout:   30 * time.Second,
        KeepAlive: 30 * time.Second,
        LocalAddr: localAddr, // Set the desired local IP address here
        DualStack: true,
    }).DialContext,
    MaxIdleConns:          100,
    IdleConnTimeout:       90 * time.Second,
    TLSHandshakeTimeout:   10 * time.Second,
    ExpectContinueTimeout: 1 * time.Second,
}

// Create an HTTP client using the custom transport
client := &http.Client{
    Transport: transport,
}

By setting the LocalAddr field of the Dialer, you can specify the source IP address to be used for HTTP requests made by the client.

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