CLC-4587 - Disabled X-Frame-Options:DENY header for UserApiController#am_i_logged_in as well as all endpoints served by CanvasCourseGradeExportController
Merge pull request #3188 from redconfetti/CLC-4587-xframe-deny-requests

CLC-4587 - Resolving issues caused by X-Frame-Options header with LTI tools in Safari