update getRomteAddr()

Author: mbfreder

aws-serverless-java-container-core/src/main/java/com/amazonaws/serverless/proxy/internal/servlet/AwsHttpServletRequest.java

@@ -76,6 +76,7 @@ public abstract class AwsHttpServletRequest implements HttpServletRequest {
     static final String PROTOCOL_HEADER_NAME = "X-Forwarded-Proto";
     static final String HOST_HEADER_NAME = "Host";
     static final String PORT_HEADER_NAME = "X-Forwarded-Port";
+    static final String CLIENT_IP_HEADER = "X-Forwarded-For";
 
 
     //-------------------------------------------------------------

aws-serverless-java-container-core/src/main/java/com/amazonaws/serverless/proxy/internal/servlet/AwsProxyHttpServletRequest.java

@@ -437,6 +437,9 @@ public String getRemoteAddr() {
         if (request.getRequestContext() == null || request.getRequestContext().getIdentity() == null) {
             return "127.0.0.1";
         }
+        if (request.getRequestContext().getElb() != null) {
+            return request.getHeaders().get(CLIENT_IP_HEADER);
+        }
         return request.getRequestContext().getIdentity().getSourceIp();
     }