How to Retrieve a User\'s IP Address in a Google App Engine Go Application?

Retrieving User's IP Address in Google App Engine Go

To integrate ReCAPTCHA into your GAE Go application, you'll need to obtain the user's IP address. This is essential for verifying CAPTCHA responses. How can we retrieve this information from a form?

Solution

In Golang, the net.SplitHostPort function can be utilized for this purpose. Here's how you can do it:

<code class="go">ip, _, _ := net.SplitHostPort(r.RemoteAddr)</code>

This code splits the r.RemoteAddr string, which contains the client's IP address and port, into its constituent parts. The IP address is stored in the ip variable.

Keep in mind that the user's IP address may be masked by a proxy server or CDN. To ensure that you obtain the actual client IP, consider implementing additional logic or using a reputable IP detection service.

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