Confluence Page Gadget in JIRA shows 'The resource /confluence/rest/webResources/1.0/resources, cannot be found.'

Summary

Using Confluence Page Gadget in JIRA shows error message 'The resource /confluence/rest/webResources/1.0/resources, cannot be found.'

Environment

• Confluence 5.8.5
• JIRA 6.4.7

Steps to Reproduce

1. Add Confluence Page Gadget to JIRA's external gadgets.
2. Add Confluence Page Gadget to JIRA dashboard.
3. Choose a Confluence page to display.

Expected Results

Page displays with no errors.

Actual Results

Page displays in the gadget with the error message at the top. See attached screenshot

Notes

Error doesn't display in Confluence 5.7.3 and JIRA 6.4.3