Describe the bug
When running a POST request, current example is requesting an Enterprise App to sync, the Graph Explorer never returns a response. The button to Send the request continually spins and the request history does not show the POST request.

To Reproduce
Steps to reproduce the behavior:

1. Go to https://developer.microsoft.com/en-us/graph/graph-explorer
2. Choose POST as the Method
3. Choose beta as the Version
4. Enter a URL of an AAD Enterprise App Sync Start (i.e. https://graph.microsoft.com/beta/servicePrincipals/[OBJECT ID]/synchronization/jobs/[JOB ID]/start)

Expected behavior

1. POST request is sent
2. History shows the record
3. Able to send another request afterwards

Screenshots
Screenshot showing the hanging POST request. This request was going on for at least 4 minutes. It should take about 5 seconds.

Desktop (please complete the following information):

• OS: Win 10 2004 (Build 19041.264)
• Browser: Microsoft Edge
• Version: Version 83.0.478.33 (Official build) beta (64-bit)