title: Can't save office online wopi documents back to the server
body: <p>I'm working on WOPI integration with one of our internal tools and I'm stuck with one issue while saving documents in client. </p>
  
  <p>I was able to set up <strong>ClientUrl</strong> to a GET method that returns file contents as  "application/octet-stream". 
  After that, by clicking "Edit in Word", Word opens successfully with needed document. But I can save only a copy of document locally.</p>
  
  <p>I implemented methods for the same URL not only for GET, but POST and PUT also, and was hoping that Word will try to save this file by calling them with file contents, but currently I can't even save from Word.</p>
  
  <p>I want to implement same functionality as SharePoint/OneDrive has, that allow me to save opened document directly to the server.</p>
  
  <p>Can please some one help me with this?</p>