Custom Application Link Configuration not working due to XSRF Security Token Missing message

Problem

When attempting to configure an Application Link to a non-Atlassian generic application:

• A warning for XSRF Security Token Missing will prevent any authentication configuration changes to be saved

Environment

Reproduce in local environment using

• Confluence Server version 7.8.3
  Here is also a list of binaries that have been tested
  atlassian-confluence-7.11.2-x64.bin / fail
  atlassian-confluence-7.10.2-x64.bin / fail
  atlassian-confluence-7.9.3-x64.bin / fail
  atlassian-confluence-7.8.3-x64.bin / fail
  atlassian-confluence-7.7.4-x64.bin / fail
  atlassian-confluence-7.6.3-x64.bin / fail
  atlassian-confluence-7.4.8-x64.bin / fail
  atlassian-confluence-7.4.7-x64.bin / fail
  atlassian-confluence-7.4.6-x64.bin / fail
  atlassian-confluence-7.4.3-x64.bin / Success
  atlassian-confluence-7.4.1-x64.bin / Success

Steps to Reproduce

• Create a new application link - we used https://www.thisisanapplicationlinktest.com just for testing
• Proceed with the creation and then Edit the new entry
• Try to save changes in either the menu for outgoing authentication or incoming authentication

Expected Results

• We expect to be able to save the changes against the application link
• We expect to see the template correctly rendered

Actual Results

• Instead we will receive a warning message on XSRF Security Token Missing message
• The template for these menus is not properly rendered
• Stack Trace as seen in the application logs. Full Stack trace as seen during the Bug reproduction is in attachments below. 

Workaround

To edit Oauth configurations:

• Delete the applink you would like to edit
• Re-create the applink
• On `Configure Application URL` dialog, fill out the whole form, don't check `Use this URL` checkbox and continue
• On `Link Application`  dialog, fill out the whole form and check `create incoming link` and continue
• Fill out the final form and submit

Notes

The recording is attached to illustrate the issue. XSRF Security Token Missing - Application Links.mp4