Test that XMLHttpRequest GET succeeds.
Status: 200
Response: Hello
Test that XMLHttpRequest POST fails.
Received exception, code: 19, name: NetworkError, message: Failed to execute 'send' on 'XMLHttpRequest': 'GET' is the only method allowed for 'blob:' URLs.
Test that XMLHttpRequest GET fails after the blob URL is revoked.
Status: 404
Response: 
DONE