Knowledge Base's attachments endpoint is not working properly in Service Desk when the attachment has a space in the file name

Summary

Can't load/download/view attachments in knowledge base from Service Desk portal when the attachment has a space in the name. Example of attachment name: attachment 1.png. The endpoint is redirecting back to Confluence with incorrect path,

 
/wiki/download/thumbnails/84082689/Attachment+1.PNG?version=1&modificationDate=1520507194166&cacheVersion=1&api=v2&width=515&height=250

Steps to Reproduce

1. Integrate a knowledge base to a service desk project.
2. Create a page and upload an attachment that has a space in the file name.
3. Load/Download/View the attachment from service desk portal.

Expected Results

• User should be able to load/download/view the attachment from the portal.

Actual Results

• Can't load/view the attachment, clicking on the attachment to download, it'll redirect to a page with 404 error.

Workaround

• Remove "api=v2" onwards from the path. Example of path:

   
  /wiki/download/thumbnails/84082689/Attachment+1.PNG?version=1&modificationDate=1520507194166&cacheVersion=1&api=v2&width=515&height=250
  

  .
  Remove &api=v2&width=515&height=250 and enter the URL directly on a new tab to download the attachment.