pig7788

@tazarov These weird changes were fixed when I rebase the previous commit. Formatting tool leads to these changes. Thank you for your reminder.

> @pig7788, this looks better. Thank you. Do you think we can also add maybe some sort of error if we don't find the response we expect? I think it...

@tazarov I add test cases that you advised and I could think of. Thank you for your suggestions. Thank @beggers too.

@tazarov I commit changes that you suggested, please confirm it, thx.

I finish the pr after my code changed. Please help me check up, thank you!