opened
beaquant
username_0
这些地方可否先判断是否设置了futuresEndPoint，如果是空，给提示panic

https://github.com/username_1-project/GoEx/blob/bd3235e139b85955640fe34290bfcb62a56281bc/builder/APIBuilder.go#L263
futuresEndPoint为空的情况需加以提示
issue
created
nntaoli
username_1
不需要提示，可以不设置endpoint的
comment
closed
nntaoli
username_1
issue
created
beaquant
username_0
不设置也没默认值呀
comment