go iris 在运行项目时报错 Get https://proxy.golang.org/github.com/%21burnt%21sushi/toml/@v/v0.3.1.mod: dial tcp 216.58.200.241:443: i/o timeout

# 使用 go env 查看
$ go env
GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/Users/lizhu/Library/Caches/go-build"
GOENV="/Users/lizhu/Library/Application Support/go/env"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOINSECURE=""
GONOPROXY=""
GONOSUMDB=""
GOOS="darwin"
GOPATH="/Users/lizhu/Testspace"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/usr/local/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/darwin_amd64"
GCCGO="gccgo"
AR="ar"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD=""
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/cw/9zpdzymx7g74wkcc0z2ttj080000gp/T/go-build136289632=/tmp/go-build -gno-record-gcc-switches -fno-common"# 修改 GOPROXY 
$ go env -w GOPROXY=https://goproxy.cn,direct
# 修改 GO111MODULE
$ go env -w GO111MODULE=on之后再次运行就不会出现错误了