The Shared and Dedicated Surrogate instances support the Anonymous Browsing Feature. This feature basically removes any HTTP request headers that indicate the web request is being sent through a Proxy. This adds a layer of Anonymity because destination websites cant tell youre using a Web Proxy and therefore dont typically ask for additional captcha solutions.
To demonstrate how this works I can compare the HTTP Headers a Destination website will see with the normal Proxy requests against the Anonymous Browsing requests.
Here we can see the HTTP Headers a website will see typically when you use a Web Proxy. This is what a request coming from the Shared Surrogate will look like:
Now this is what the Headers look like from the Surrogate. You can see the ‘Via’ and ‘X-Forwarded-For’ Headers are no longer included in the request. Essentially, removing those Headers leaves little indication that your Web Traffic is using a Proxy like Browser Surrogate.