golang 改造 requests

eson 2307e6eb10 req is nil with Client.Do		2018-12-18 01:09:29 +08:00
tests
.gitignore
base.go
multipart.go
response_test.go
response.go
session_test.go
session.go
upload_file.go
workflow.go	req is nil with Client.Do	2018-12-18 01:09:29 +08:00