Summary

After adding any Jira Gadget to Confluence (through the Gadget Feed), the data is partially added to Confluence. The Preview will be blank and it will appear a "Please complete the configuration in the preview area first" message, but users are unable to complete or add any data.

Environment

• Confluence Server or Data Center
• Confluence and Jira are running behind an Apache reverse-proxy

Diagnosis

• The preview area will be blank and users are unable to add any data to it.
• The message "Please complete the configuration in the preview area first" will appear next to the Insert button.
• The Insert button will be inactive.

• The Web Browser Console will display the following message:

  Refused to load the stylesheet '<URL>' because it violates the following Content Security Policy directive: "default-src 'self' 'unsafe-inline' 'unsafe-eval' ". Note that 'style-src-elem' was not explicitly set, so 'default-src' is used as a fallback.

Cause

• The Apache reverse-proxy is blocking external resources (fonts, scripts, XML).

Solution

• Disable the Apache proxy; or
• Update the Apache proxy configuration to allow downloading and uploading resources from Jira's server.