Error：

go: github.com/360EntSecGroup-Skylar/excelize@v1.3.1-0.20180527032555-9e463b461434: Get "https://proxy.golang.org/github.com/360%21ent%
21sec%21group-%21skylar/excelize/@v/v1.3.1-0.20180527032555-9e463b461434.mod": dial tcp 34.64.4.81:443: connectex: A connection attempt
 failed because the connected party did not properly respond after a period of time, or established connection failed because connected
 host has failed to respond.
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Solution:

go env -w GOSUMDB=off

# 更换代理，无需翻墙。
go env -w GOPROXY=https://goproxy.cn,direct
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然后启动项目就能正常下载依赖包了

D:\GoProjects\open source project\go-gin-example>go run main.go
go: downloading github.com/gin-gonic/gin v1.4.0
go: downloading github.com/go-ini/ini v1.32.1-0.20180214101753-32e4be5f41bb
go: downloading github.com/jinzhu/gorm v0.0.0-20180213101209-6e1387b44c64
go: downloading github.com/unknwon/com v1.0.1
go: downloading github.com/swaggo/gin-swagger v1.2.0
go: downloading github.com/dgrijalva/jwt-go v3.1.0+incompatible
go: downloading github.com/swaggo/swag v1.5.1复制