Steps to Reproduce

1. Create a new Cloud instance with JIRA + Confluence.
2. Create a new project within JIRA and the corresponding linked Confluence space.
3. Edit the home page of the Confluence space, go to Insert > Other Macros, select the JIRA Issues Calendar macro.
4. In the Preview pane, start typing the project key of your newly-created project in the "Project or Saved Filter" field.

Expected Results

The name of the project you searched for appears.

Actual Results

In the Javascript console, two errors appear. The first shows this URL returning a 400 ("Malformed header specified" if you go into it), and the second says:

[Error] TypeError: undefined is not an object (evaluating 'response.headers["x-seraph-trusted-app-status"]')
	handleResponse (com.atlassian.gadgets.publisher:ajax.js, line 15)
	(anonymous function) (com.atlassian.gadgets.publisher:ajax.js, line 15)
	hadError (auth-refresh.js, line 313)
	processResponse (auth-refresh.js, line 320)
	(anonymous function) (auth-refresh.js, line 70)

Notes

This only affects the macro being embedded into a Confluence page, on JIRA's own dashboard it's fine. This also means that the gadget can't be inserted onto a page, as Confluence's macro browser gives a warning saying "Please complete the configuration in the preview area first".

Workaround

No workaround yet.