Just noticed this behavior. The requests seem flaky. Some go through and I am able to retrieve the sheet, some don't and it gets stuck at the "Searching for Worksheet ...".
Saw a related post on SO for the same:
https://stackoverflow.com/questions/31708602/spreadsheet-api-hangs-forever?newreg=ff9c1d4320ef4df88674e021a0b13fc2
Just noticed this behavior. The requests seem flaky. Some go through and I am able to retrieve the sheet, some don't and it gets stuck at the "Searching for Worksheet ...".
Saw a related post on SO for the same:
https://stackoverflow.com/questions/31708602/spreadsheet-api-hangs-forever?newreg=ff9c1d4320ef4df88674e021a0b13fc2