Premise
I had this code, https://realmpksharepoint.wordpress.com/2014/04/07/get-webpart-page-of-a-sharepoint-site-using-web-services-c/ which I was using to download the html content of a SharePoint page along with all the web parts. The importance of this method is that it eliminates the external file references, so in the response, you will get the schema of all the web parts of that page only.
Issue
The code was working fine until recently, when it suddenly stopped working and I started to receive the error, 403 Forbidden.
Piyush K Singh 