Web server proxy

Scott Forsyth's Blog

imageThere are times when you need to reverse proxy through a server. The most common example is when you have an internal web server that isn’t exposed to the internet, and you have a public web server accessible to the internet. If you want to serve up traffic from the internal web server, you can do this through the public web server by creating a tunnel (aka reverse proxy).

Essentially, you can front the internal web server with a friendly URL, even hiding custom ports.

For example, consider an internal web server with a URL of You can make that available through a public URL like as seen in the following image. The URL can be made public or it can be used for your internal staff and have it password protected and/or locked down by IP address.

image

This is easy to do with URL Rewrite and IIS. You will also need Application Request Routing (ARR) installed even though for a simple reverse proxy you won’t use most of ARR’s functionality. If you don’t already have URL Rewrite and ARR installed you can do so easily with the Web Platform Installer.

A lot can be said about reverse proxies and many different situations and ways to route the traffic and handle different URL patterns. However, my goal here is to get you up and going in the easiest way possible. Then you can dig in deeper after you get the base configuration in place.

imageURL Rewrite makes a reverse proxy very easy to set up. Note that the URL Rewrite Add Rules template doesn’t include Reverse Proxy at the server level. That’s not to say that you can’t create a server-level reverse proxy, but the URL Rewrite rules template doesn’t help you with that.

Getting Started

First you must create a website on your public web server that has the public bindings that you need. Alternately, you can use an existing site and route using conditions for certain traffic.

After you’ve created your site then open up URL Rewrite at the site level.

Using the “Add Rule(s)…” template that is opened from the right-hand actions pane, create a new Reverse Proxy rule.

Source: weblogs.asp.net


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