Obtaining User IP Addresses in Phoenix LiveView Applications

This article details methods for obtaining user IP addresses in Phoenix LiveView applications. It discusses extracting user IP from the peer data and the challenges encountered when deploying behind a reverse proxy. The peer data approach works directly but fails with a proxy, which only shows the proxy's IP. To solve this, the article recommends accessing request headers, particularly the x-real-ip and x-forwarded-for headers, which typically contain the user's real IP. It provides code examples for configuring the application to capture these headers to ensure accurate user IP retrieval in different deployment scenarios.