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Update module example.
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‎example/module/README.md‎

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## 初始化工程
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```bash
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go list -m all
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go install
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go clean -modcache
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```
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mkdir mod2
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cd mod2
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go mod init mod2
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```
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## 安装包
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```bash
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go get -m github.com/gin-gonic/gin@v1.3.0
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go get github.com/gorilla/mux # 匹配最新的一个 tag
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go get github.com/gorilla/mux@latest # 和上面一样
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go get github.com/gorilla/mux@v1.6.2 # 匹配 v1.6.2
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go get github.com/gorilla/mux@e3702bed2 # 匹配 v1.6.2
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go get github.com/gorilla/mux@c856192 # 匹配 c85619274f5d
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go get github.com/gorilla/mux@master # 匹配 master 分支
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```
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1. 通过 `go get` 切换版本
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2. 执行 `go mod vendor` 将依赖复制到vendor下
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3. 通过 `go mod tidy` 命令可以移除 `go.mod` 中不再使用的依赖
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## 设置代理
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```bash
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# bash mac
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export GOPROXY=https://goproxy.io
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```
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## mod 命令
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```bash
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go help mod
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# Go mod provides access to operations on modules.
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# Note that support for modules is built into all the go commands,
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# not just 'go mod'. For example, day-to-day adding, removing, upgrading,
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# and downgrading of dependencies should be done using 'go get'.
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# See 'go help modules' for an overview of module functionality.
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Usage:
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go mod <command> [arguments]
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The commands are:
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download download modules to local cache
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edit edit go.mod from tools or scripts
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graph print module requirement graph
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init initialize new module in current directory
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tidy add missing and remove unused modules
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vendor make vendored copy of dependencies
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verify verify dependencies have expected content
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why explain why packages or modules are needed
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Use "go help mod <command>" for more information about a command.
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```
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- `download`: download modules to local cache (下载依赖的module到本地cache)
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- `edit`: edit go.mod from tools or scripts (编辑go.mod文件)
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- `graph`: print module requirement graph (打印模块依赖图)
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- `init`: initialize new module in current directory (再当前文件夹下初始化一个新的module, 创建go.mod文件)
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- `tidy`: add missing and remove unused modules (增加丢失的module，去掉未用的module)
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- `vendor`: make vendored copy of dependencies (将依赖复制到vendor下)
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- `verify`: verify dependencies have expected content (校验依赖)
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- `why`: explain why packages or modules are needed (解释为什么需要依赖)

‎example/module/go.mod‎

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module "https://github.com/gin-gonic/gin.git"
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module mod2
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require (
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github.com/gin-contrib/sse v0.0.0-20170109093832-22d885f9ecc7 // indirect
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github.com/gin-gonic/gin v1.3.0
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github.com/golang/protobuf v1.2.0 // indirect
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github.com/json-iterator/go v1.1.5 // indirect
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github.com/mattn/go-isatty v0.0.4 // indirect
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github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
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github.com/modern-go/reflect2 v1.0.1 // indirect
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github.com/stretchr/testify v1.3.0 // indirect
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github.com/ugorji/go/codec v0.0.0-20181209151446-772ced7fd4c2 // indirect
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golang.org/x/net v0.0.0-20190110200230-915654e7eabc // indirect
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golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4 // indirect
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golang.org/x/sys v0.0.0-20190116161447-11f53e031339 // indirect
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gopkg.in/go-playground/assert.v1 v1.2.1 // indirect
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gopkg.in/go-playground/validator.v8 v8.18.2 // indirect
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gopkg.in/yaml.v2 v2.2.2 // indirect
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)

‎example/module/go.sum‎

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github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
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github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
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github.com/gin-contrib/sse v0.0.0-20170109093832-22d885f9ecc7 h1:AzN37oI0cOS+cougNAV9szl6CVoj2RYwzS3DpUQNtlY=
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github.com/gin-contrib/sse v0.0.0-20170109093832-22d885f9ecc7/go.mod h1:VJ0WA2NBN22VlZ2dKZQPAPnyWw5XTlK1KymzLKsr59s=
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github.com/gin-gonic/gin v1.3.0 h1:kCmZyPklC0gVdL728E6Aj20uYBJV93nj/TkwBTKhFbs=
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github.com/gin-gonic/gin v1.3.0/go.mod h1:7cKuhb5qV2ggCFctp2fJQ+ErvciLZrIeoOSOm6mUr7Y=
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github.com/golang/protobuf v1.2.0 h1:P3YflyNX/ehuJFLhxviNdFxQPkGK5cDcApsge1SqnvM=
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github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
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github.com/json-iterator/go v1.1.5 h1:gL2yXlmiIo4+t+y32d4WGwOjKGYcGOuyrg46vadswDE=
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github.com/json-iterator/go v1.1.5/go.mod h1:+SdeFBvtyEkXs7REEP0seUULqWtbJapLOCVDaaPEHmU=
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github.com/mattn/go-isatty v0.0.4 h1:bnP0vzxcAdeI1zdubAl5PjU6zsERjGZb7raWodagDYs=
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github.com/mattn/go-isatty v0.0.4/go.mod h1:M+lRXTBqGeGNdLjl/ufCoiOlB5xdOkqRJdNxMWT7Zi4=
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github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd h1:TRLaZ9cD/w8PVh93nsPXa1VrQ6jlwL5oN8l14QlcNfg=
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github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=
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github.com/modern-go/reflect2 v1.0.1 h1:9f412s+6RmYXLWZSEzVVgPGK7C2PphHj5RJrvfx9AWI=
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github.com/modern-go/reflect2 v1.0.1/go.mod h1:bx2lNnkwVCuqBIxFjflWJWanXIb3RllmbCylyMrvgv0=
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github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
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github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
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github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
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github.com/stretchr/testify v1.3.0 h1:TivCn/peBQ7UY8ooIcPgZFpTNSz0Q2U6UrFlUfqbe0Q=
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github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
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github.com/ugorji/go/codec v0.0.0-20181209151446-772ced7fd4c2 h1:EICbibRW4JNKMcY+LsWmuwob+CRS1BmdRdjphAm9mH4=
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github.com/ugorji/go/codec v0.0.0-20181209151446-772ced7fd4c2/go.mod h1:VFNgLljTbGfSG7qAOspJ7OScBnGdDN/yBr0sguwnwf0=
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golang.org/x/net v0.0.0-20190110200230-915654e7eabc h1:Yx9JGxI1SBhVLFjpAkWMaO1TF+xyqtHLjZpvQboJGiM=
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golang.org/x/net v0.0.0-20190110200230-915654e7eabc/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
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golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4 h1:YUO/7uOKsKeq9UokNS62b8FYywz3ker1l1vDZRCRefw=
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golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
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golang.org/x/sys v0.0.0-20190116161447-11f53e031339 h1:g/Jesu8+QLnA0CPzF3E1pURg0Byr7i6jLoX5sqjcAh0=
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golang.org/x/sys v0.0.0-20190116161447-11f53e031339/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
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gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
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gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
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gopkg.in/go-playground/assert.v1 v1.2.1 h1:xoYuJVE7KT85PYWrN730RguIQO0ePzVRfFMXadIrXTM=
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gopkg.in/go-playground/assert.v1 v1.2.1/go.mod h1:9RXL0bg/zibRAgZUYszZSwO/z8Y/a8bDuhia5mkpMnE=
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gopkg.in/go-playground/validator.v8 v8.18.2 h1:lFB4DoMU6B626w8ny76MV7VX6W2VHct2GVOI3xgiMrQ=
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gopkg.in/go-playground/validator.v8 v8.18.2/go.mod h1:RX2a/7Ha8BgOhfk7j780h4/u/RRjR0eouCJSH80/M2Y=
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gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=

‎example/module/main.go‎

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package main
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import (
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"html/template"
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"log"
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"os"
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"github.com/gin-gonic/gin"
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)
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var html = template.Must(template.New("https").Parse(`
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<html>
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<head>
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<title>Https Test</title>
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</head>
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<body>
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<h1 style="color:red;">Welcome, golang!</h1>
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</body>
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</html>
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`))
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func main() {
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logger := log.New(os.Stderr, "", 0)
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logger.Println("[WARNING] DON'T USE THE EMBED CERTS FROM THIS EXAMPLE IN PRODUCTION ENVIRONMENT, GENERATE YOUR OWN!")
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r := gin.Default()
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r.SetHTMLTemplate(html)
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r.GET("/", func(c *gin.Context) {
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c.HTML(200, "https", gin.H{
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"status": "success",
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})
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})
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// Listen and Server in https://127.0.0.1:8080
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r.Run(":8083")
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}

‎example/module/module.go‎

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