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Client ip in nginx reverse proxy

Download 1M+ code from https://codegive.com/a12e0c8 understanding client ip in nginx reverse proxy: a deep dive when you place nginx as a reverse proxy in front of your application servers, things get interesting when it comes to determining the actual ip address of the client making requests. the application server, seeing the traffic originating from nginx, will perceive nginx's ip address instead of the true client's ip. this poses a problem for several reasons: *logging:* accurate logging of client ips is crucial for security auditing, debugging, and analytics. *geolocation:* you might want to offer location-based services based on the client's ip. *access control:* you may need to implement access control based on ip address. *rate limiting:* effective rate limiting requires identifying the source of the requests, which is the client ip. this tutorial will cover various techniques to correctly retrieve the client ip address when using nginx as a reverse proxy, along with detailed explanations and code examples. we will explore the following topics: 1. *the problem: why your application sees the proxy's ip* 2. *x-forwarded-for (xff) header* 3. *x-real-ip header* 4. *configuration on nginx (the reverse proxy)* 5. *application server configuration (receiving the headers)* 6. *trusting proxies with `set_real_ip_from` and `real_ip_header`* 7. *security considerations: preventing header spoofing* 8. *using `ngx_http_geoip2_module` (geolocation based on ip)* 9. *complete example and best practices* *1. the problem: why your application sees the proxy's ip* imagine this scenario: *client:* 203.0.113.1 (user browsing your website) *nginx (reverse proxy):* 192.0.2.1 *application server:* 10.0.1.1 when the client (203.0.113.1) makes a request, it goes to nginx (192.0.2.1). nginx then forwards the request to the application server (10.0.1.1). from the application server's perspective, the connection originated from nginx (192.0.2.1). the application s ... #Nginx #ReverseProxy #americandefense client ip nginx reverse proxy real ip X-Forwarded-For proxy_set_header remote_addr trusted proxies logging client IP forwarded for header nginx configuration obtaining client IP reverse proxy setup client address access logs security headers