403 Forbidden Error while calling GetWebPartPage SharePoint Online

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.

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Download Large Files from SharePoint Online

In my previous post, I had explained how to upload large files up to 10 GB to SharePoint Online. This is as per the new revised upload limit. The upload operation, as we know, is actually incomplete without download. I mistakenly, assumed that the previous code for file download will work for the latest larger files as well. But, just like I had to rewrite the upload code to accommodate this new limit, file download also needed a complete makeover. I initially tried the following ways with no success.

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Upload Large Files to SharePoint Online

Microsoft has now increased the SharePoint per file upload size limit to 10 GB. Here’s a full list of SharePoint Online limitations. Now, this has thrown up a number of new challenges for this upload to be carried out through code.

  • Cannot keep such a large file in a single .NET object.
  • It’s very difficult to upload a file of this magnitude in a single HTTP request. If ever, the connection fails, the entire upload would have to be restarted! For a large file, this could easily turn into a nightmare for us.

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