Agile Gadgets' requests return "400 Bad Request" errors

Problem Experienced

Some of Jira Agile's gadget produce requests that result in "400 Bad Request" responses from the server.

Steps to reproduce

Create a board, and add any of the following gadgets to it:

• Agile Wallboard Gadget
• Sprint Burndown Gadget
• Version Report

In the developer tab, disable browser's cache and refresh the page.

Existing Behavior

Requests made by the gadgets to the URL http://localhost:2990/jira/plugins/servlet/gadgets/makeRequest fail with 400 error code.

Expected Behavior

The gadgets do not make requests resulting in such errors.

Notes

It does not look like the errors cause any harm, the gadgets work fine despite them.

The errors can cause unnecessary false positives in the monitoring tools though.