Remote Ip Address Trace With Nginx From Spring Boot

Posted By : Md Imroz Alam | 21-May-2018

Java

Nginx is a fast and reliable server with low memory consumption. When we configure our spring boot application with a reverse proxy in Nginx configuration. we unable to exact IP address of the remote client. it shows 127.0.0.1 or same IP address of deployed server due to reverse proxy.

Following are configuration with Nginx

server {
    listen       80 default_server;
    server_name  example.com;

    location / {
        proxy_set_header X-Forwarded-Host $host:$server_port;
        proxy_set_header X-Forwarded-Server $host;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_pass http://127.0.0.1:8080;
    }
}

X-Forwarded-Host:- It gives us client request port number.

X-Forwarded-Server:- It gives us client hostname.

X-Forwarded-For:- It gives us client exact IP address.

we simply get the IP address by request.getHeader("X-Forwarded-For") of HttpServeletRequest. this code statement, the IP address are separated by "," delimiter first entry will be exact IP address.

Following is code for a spring-boot application

@RequestMapping(value = "/get/ipaddress", method = RequestMethod.GET)
Object IPAddress(HttpServletRequest request) {
Map<String,Object> result = new HashMap<String, Object>();
try {
String remoteAddress="";
if (request != null) {
remoteAddress = request.getHeader("X-Forwarded-For");
if (remoteAddress == null || "".equals(remoteAddress)) {
remoteAddress = request.getRemoteAddr();
}
}
remoteAddress=remoteAddress!=null && remoteAddress.contains(",")
? remoteAddress.split(",")[0]
: remoteAddress;
LOGGER.info("remote ip addres {}",remoteAddress);
result.put("ipAddress",remoteAddress);
return ResponseHandler.generateResponse(HttpStatus.OK, true, "Success", result);
} catch (Exception e) {
return ResponseHandler.generateResponse(HttpStatus.INTERNAL_SERVER_ERROR, false, e.getMessage(), result);
}
}

Thanks, I hope this will be helpful.