Get the limitation of google access (not API)

I access google finance url like this.

http://ift.tt/2uKmxr6

(stock chart historical data)

However , if call many times at the same time, it returns 400 bad Request error.

I think it is of course though, I would like to know the limitation or current number I can call (per hour or something)

I don't use API, so I an not sure how to know the access limitation.

(They abandoned google finance API already)

Is there any way to know the limitation of google accesss??