fix ctx.ip

need tests for this

lib/request.js

@@ -307,7 +307,7 @@ Request.prototype = {
    */
 
   get ip() {
-    return this.ips[0] || this.connection.remoteAddress;
+    return this.ips[0] || this.socket.remoteAddress;
   },
 
   /**

lib/response.js

@@ -42,6 +42,18 @@ function Response(ctx){
 
 Response.prototype = {
 
+  /**
+   * Return the request socket.
+   *
+   * @return {Connection}
+   * @api public
+   */
+
+  get socket() {
+    // TODO: TLS
+    return this.ctx.req.socket;
+  },
+
   /**
    * Return response header.
    *