GoogleChrome/chrome-app-samples — pull request #159 by MatrixFrog (2013-11-01 22:36:49+00:00)
Title: Don't JSON.stringify() the body of a request.

The body that is passed in should already be a string [1], so JSON.stringify()ing it is unnecessary and incorrect.

[1] https://developers.google.com/api-client-library/javascript/reference/referencedocs#gapiclientrequest