[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"article-detail-ssr-45719826437508108":3},{"id":4,"title":5,"tag":6,"createTime":7,"updateTime":8,"renderedHtml":9,"description":10,"ogImageUrl":11},"45719826437508108","Gin框架---中间件","Go语言","2023-11-12","2025-11-30","\u003Cblockquote>\n\u003Cp>Gin 框架允许开发者在处理请求的过程中，加入用户自己的钩子（Hook）函数。这个钩子函数就叫中间件，中间件适合处理一些公共的业务逻辑，比如登录认证、权限校验、数据分页、记录日志、耗时统计等。\u003C\u002Fp>\n\u003C\u002Fblockquote>\n\u003Ch2 id=\"h2-0-\">定义中间件\u003C\u002Fh2>\n\u003Cp>Gin 中的中间件必须是一个 gin.HandlerFunc 类型。\u003C\u002Fp>\n\u003Ch3 id=\"h3-1-\">洋葱模型\u003C\u002Fh3>\n\u003Cdiv class=\"mermaid-block\" data-mermaid-rendered=\"false\">\u003Cbutton class=\"mermaid-fullscreen-btn\" type=\"button\" aria-label=\"全屏查看图表\" title=\"全屏\">\u003Csvg viewBox=\"0 0 24 24\" width=\"17\" height=\"17\" aria-hidden=\"true\">\u003Cpath fill=\"currentColor\" d=\"M7 14H5v5h5v-2H7v-3zm-2-4h2V7h3V5H5v5zm12 7h-3v2h5v-5h-2v3zM14 5v2h3v3h2V5h-5z\"\u002F>\u003C\u002Fsvg>\u003C\u002Fbutton>\u003Cdiv class=\"mermaid-content\">\u003Cpre class=\"mermaid-source\">flowchart TB\n    R[请求] --> L1\n    L1 --> S[响应]\n\n    subgraph L1[中间件1（外层）]\n      direction TB\n      subgraph L2[中间件2（中层）]\n        direction TB\n        subgraph L3[中间件3（内层）]\n          direction TB\n          H[(处理器\u002FHandler)]\n        end\n      end\n    end\n\u003C\u002Fpre>\u003C\u002Fdiv>\u003C\u002Fdiv>\n\u003Cp>看上图，我们的中间件就相当于一层一层的洋葱。如果要到洋葱内部，需要一层一层的进入。同理，出来也是一层一层的出来。也就是说，每个中间件先做“前置”，调用 next() 进入更内层，待内层完成后再执行“后置”并返回。\u003C\u002Fp>\n\u003Cp>如下图所示：\u003C\u002Fp>\n\u003Cdiv class=\"mermaid-block\" data-mermaid-rendered=\"false\">\u003Cbutton class=\"mermaid-fullscreen-btn\" type=\"button\" aria-label=\"全屏查看图表\" title=\"全屏\">\u003Csvg viewBox=\"0 0 24 24\" width=\"17\" height=\"17\" aria-hidden=\"true\">\u003Cpath fill=\"currentColor\" d=\"M7 14H5v5h5v-2H7v-3zm-2-4h2V7h3V5H5v5zm12 7h-3v2h5v-5h-2v3zM14 5v2h3v3h2V5h-5z\"\u002F>\u003C\u002Fsvg>\u003C\u002Fbutton>\u003Cdiv class=\"mermaid-content\">\u003Cpre class=\"mermaid-source\">sequenceDiagram\n    participant C as 客户端\u002F请求\n    participant M1 as 中间件1\n    participant M2 as 中间件2\n    participant M3 as 中间件3\n    participant H as 处理器\u002FHandler\n\n    C->>M1: 进入\n    M1->>M2: next()\n    M2->>M3: next()\n    M3->>H: next()\n    H-->>M3: 返回（业务结果）\n    M3-->>M2: 后置逻辑\n    M2-->>M1: 后置逻辑\n    M1-->>C: 响应\n\u003C\u002Fpre>\u003C\u002Fdiv>\u003C\u002Fdiv>\n\u003Ch3 id=\"h3-2-\">统计耗时请求耗时的中间件\u003C\u002Fh3>\n\u003Cdiv class=\"ssr-code-block\" data-lang=\"go\">\u003Cdiv class=\"ssr-code-head\">\u003Cspan class=\"ssr-code-lang\">go\u003C\u002Fspan>\u003Cdiv class=\"ssr-code-actions\">\u003Cbutton class=\"ssr-code-fullscreen ssr-code-iconbtn\" type=\"button\" aria-label=\"全屏查看代码\" title=\"全屏\">\u003Csvg viewBox=\"0 0 24 24\" width=\"17\" height=\"17\" aria-hidden=\"true\">\u003Cpath fill=\"currentColor\" d=\"M5 5h6v2H7v4H5V5zm14 0v6h-2V7h-4V5h6zM5 19v-6h2v4h4v2H5zm14 0h-6v-2h4v-4h2v6z\"\u002F>\u003C\u002Fsvg>\u003C\u002Fbutton>\u003Cbutton class=\"ssr-code-copy ssr-code-iconbtn\" type=\"button\" aria-label=\"复制代码\" title=\"复制\">\u003Csvg class=\"ssr-code-copy-icon ssr-code-copy-icon--default\" viewBox=\"0 0 24 24\" width=\"15\" height=\"15\" aria-hidden=\"true\">\u003Cpath fill=\"currentColor\" d=\"M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z\"\u002F>\u003C\u002Fsvg>\u003Csvg class=\"ssr-code-copy-icon ssr-code-copy-icon--success\" viewBox=\"0 0 24 24\" width=\"15\" height=\"15\" aria-hidden=\"true\">\u003Cpath fill=\"currentColor\" d=\"M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z\"\u002F>\u003C\u002Fsvg>\u003Csvg class=\"ssr-code-copy-icon ssr-code-copy-icon--error\" viewBox=\"0 0 24 24\" width=\"15\" height=\"15\" aria-hidden=\"true\">\u003Cpath fill=\"currentColor\" d=\"M19 6.41L17.59 5 12 10.59 6.41 5 5 6.41 10.59 12 5 17.59 6.41 19 12 13.41 17.59 19 19 17.59 13.41 12z\"\u002F>\u003C\u002Fsvg>\u003C\u002Fbutton>\u003C\u002Fdiv>\u003C\u002Fdiv>\u003Cdiv class=\"ssr-code-body\">\u003Cdiv class=\"ssr-code-pane\">\u003Cdiv class=\"ssr-code-gutter\" aria-hidden=\"true\">\u003Cspan class=\"ssr-code-num\">1\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">2\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">3\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">4\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">5\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">6\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">7\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">8\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">9\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">10\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">11\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">12\u003C\u002Fspan>\u003C\u002Fdiv>\u003Cpre class=\"ssr-code-pre\">\u003Ccode class=\"hljs language-go\">\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#6A737D\">\u002F\u002F Cost 是一个统计耗时请求耗时的中间件\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#F97583\">func\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\"> \u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">Cost\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">() \u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">gin\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">.\u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">HandlerFunc\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\"> {\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">    \u003C\u002Fspan>\u003Cspan style=\"color:#F97583\">return\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\"> \u003C\u002Fspan>\u003Cspan style=\"color:#F97583\">func\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">(\u003C\u002Fspan>\u003Cspan style=\"color:#FFAB70\">c\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\"> \u003C\u002Fspan>\u003Cspan style=\"color:#F97583\">*\u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">gin\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">.\u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">Context\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">) {\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">        start \u003C\u002Fspan>\u003Cspan style=\"color:#F97583\">:=\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\"> time.\u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">Now\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">()\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">        c.\u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">Set\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">(\u003C\u002Fspan>\u003Cspan style=\"color:#9ECBFF\">"name"\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">, \u003C\u002Fspan>\u003Cspan style=\"color:#9ECBFF\">"bing"\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">) \u003C\u002Fspan>\u003Cspan style=\"color:#6A737D\">\u002F\u002F 可以通过c.Set在请求上下文中设置值，后续的处理函数能够取到该值\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">        c.\u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">Next\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">()\u003C\u002Fspan>\u003Cspan style=\"color:#6A737D\">\u002F\u002F 调用该请求的剩余处理程序\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">        \u003C\u002Fspan>\u003Cspan style=\"color:#6A737D\">\u002F\u002F c.Abort() \u002F\u002F 不调用该请求的剩余处理程序\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">        cost \u003C\u002Fspan>\u003Cspan style=\"color:#F97583\">:=\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\"> time.\u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">Since\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">(start) \u003C\u002Fspan>\u003Cspan style=\"color:#6A737D\">\u002F\u002F 计算耗时\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">        log.\u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">Println\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">(cost)\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">    }\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">}\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">​\u003C\u002Fspan>\u003C\u002Fcode>\u003C\u002Fpre>\u003C\u002Fdiv>\u003C\u002Fdiv>\u003C\u002Fdiv>\n\u003Ch3 id=\"h3-3--cors\">跨域中间件 cors\u003C\u002Fh3>\n\u003Cp>推荐使用社区的\u003Ca href=\"https:\u002F\u002Fgithub.com\u002Fgin-contrib\u002Fcors\">https:\u002F\u002Fgithub.com\u002Fgin-contrib\u002Fcors\u003C\u002Fa> 库，几行代码解决前后端分离架构下的跨域问题。\u003C\u002Fp>\n\u003Cdiv class=\"ssr-code-block\" data-lang=\"go\">\u003Cdiv class=\"ssr-code-head\">\u003Cspan class=\"ssr-code-lang\">go\u003C\u002Fspan>\u003Cdiv class=\"ssr-code-actions\">\u003Cbutton class=\"ssr-code-fullscreen ssr-code-iconbtn\" type=\"button\" aria-label=\"全屏查看代码\" title=\"全屏\">\u003Csvg viewBox=\"0 0 24 24\" width=\"17\" height=\"17\" aria-hidden=\"true\">\u003Cpath fill=\"currentColor\" d=\"M5 5h6v2H7v4H5V5zm14 0v6h-2V7h-4V5h6zM5 19v-6h2v4h4v2H5zm14 0h-6v-2h4v-4h2v6z\"\u002F>\u003C\u002Fsvg>\u003C\u002Fbutton>\u003Cbutton class=\"ssr-code-copy ssr-code-iconbtn\" type=\"button\" aria-label=\"复制代码\" title=\"复制\">\u003Csvg class=\"ssr-code-copy-icon ssr-code-copy-icon--default\" viewBox=\"0 0 24 24\" width=\"15\" height=\"15\" aria-hidden=\"true\">\u003Cpath fill=\"currentColor\" d=\"M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z\"\u002F>\u003C\u002Fsvg>\u003Csvg class=\"ssr-code-copy-icon ssr-code-copy-icon--success\" viewBox=\"0 0 24 24\" width=\"15\" height=\"15\" aria-hidden=\"true\">\u003Cpath fill=\"currentColor\" d=\"M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z\"\u002F>\u003C\u002Fsvg>\u003Csvg class=\"ssr-code-copy-icon ssr-code-copy-icon--error\" viewBox=\"0 0 24 24\" width=\"15\" height=\"15\" aria-hidden=\"true\">\u003Cpath fill=\"currentColor\" d=\"M19 6.41L17.59 5 12 10.59 6.41 5 5 6.41 10.59 12 5 17.59 6.41 19 12 13.41 17.59 19 19 17.59 13.41 12z\"\u002F>\u003C\u002Fsvg>\u003C\u002Fbutton>\u003C\u002Fdiv>\u003C\u002Fdiv>\u003Cdiv class=\"ssr-code-body\">\u003Cdiv class=\"ssr-code-pane\">\u003Cdiv class=\"ssr-code-gutter\" aria-hidden=\"true\">\u003Cspan class=\"ssr-code-num\">1\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">2\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">3\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">4\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">5\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">6\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">7\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">8\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">9\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">10\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">11\u003C\u002Fspan>\u003C\u002Fdiv>\u003Cpre class=\"ssr-code-pre\">\u003Ccode class=\"hljs language-go\">\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">r \u003C\u002Fspan>\u003Cspan style=\"color:#F97583\">:=\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\"> gin.\u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">New\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">()\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">​\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#6A737D\">\u002F\u002F解决跨域问题\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">corsConfig \u003C\u002Fspan>\u003Cspan style=\"color:#F97583\">:=\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\"> \u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">cors\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">.\u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">Config\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">{\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">    AllowOrigins:     []\u003C\u002Fspan>\u003Cspan style=\"color:#F97583\">string\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">{\u003C\u002Fspan>\u003Cspan style=\"color:#9ECBFF\">"https:\u002F\u002Fdemo.com"\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">},\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">    AllowMethods:     []\u003C\u002Fspan>\u003Cspan style=\"color:#F97583\">string\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">{\u003C\u002Fspan>\u003Cspan style=\"color:#9ECBFF\">"GET"\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">, \u003C\u002Fspan>\u003Cspan style=\"color:#9ECBFF\">"POST"\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">, \u003C\u002Fspan>\u003Cspan style=\"color:#9ECBFF\">"PUT"\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">, \u003C\u002Fspan>\u003Cspan style=\"color:#9ECBFF\">"DELETE"\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">, \u003C\u002Fspan>\u003Cspan style=\"color:#9ECBFF\">"OPTIONS"\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">},\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">    AllowHeaders:     []\u003C\u002Fspan>\u003Cspan style=\"color:#F97583\">string\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">{\u003C\u002Fspan>\u003Cspan style=\"color:#9ECBFF\">"*"\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">},\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">    MaxAge:           \u003C\u002Fspan>\u003Cspan style=\"color:#79B8FF\">12\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\"> \u003C\u002Fspan>\u003Cspan style=\"color:#F97583\">*\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\"> time.Hour,\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">    AllowCredentials: \u003C\u002Fspan>\u003Cspan style=\"color:#79B8FF\">true\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">,\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">}\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">r.\u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">Use\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">(cors.\u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">New\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">(corsConfig))\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fcode>\u003C\u002Fpre>\u003C\u002Fdiv>\u003C\u002Fdiv>\u003C\u002Fdiv>\n\u003Ch2 id=\"h2-4-gin-\">Gin 框架内置中间件\u003C\u002Fh2>\n\u003Ch3 id=\"h3-5-gin-\">Gin 框架自带的中间件\u003C\u002Fh3>\n\u003Cul>\n\u003Cli>func BasicAuth(accounts Accounts) HandlerFunc\u003C\u002Fli>\n\u003Cli>func BasicAuthForRealm(accounts Accounts, realm string) HandlerFunc\u003C\u002Fli>\n\u003Cli>func Bind(val interface{}) HandlerFunc \u002F\u002F拦截请求参数并进行绑定\u003C\u002Fli>\n\u003Cli>func ErrorLogger() HandlerFunc \u002F\u002F错误日志处理\u003C\u002Fli>\n\u003Cli>func ErrorLoggerT(typ ErrorType) HandlerFunc \u002F\u002F自定义类型的错误日志处理\u003C\u002Fli>\n\u003Cli>func Logger() HandlerFunc \u002F\u002F日志记录\u003C\u002Fli>\n\u003Cli>func LoggerWithConfig(conf LoggerConfig) HandlerFunc\u003C\u002Fli>\n\u003Cli>func LoggerWithFormatter(f LogFormatter) HandlerFunc\u003C\u002Fli>\n\u003Cli>func LoggerWithWriter(out io.Writer, notlogged …string) HandlerFunc\u003C\u002Fli>\n\u003Cli>func Recovery() HandlerFunc\u003C\u002Fli>\n\u003Cli>func RecoveryWithWriter(out io.Writer) HandlerFunc\u003C\u002Fli>\n\u003Cli>func WrapF(f http.HandlerFunc) HandlerFunc \u002F\u002F将 http.HandlerFunc 包装成中间件\u003C\u002Fli>\n\u003Cli>func WrapH(h http.Handler) HandlerFunc \u002F\u002F将 http.Handler 包装成中间件\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Ch3 id=\"h3-6-gin-\">Gin 框架默认路由使用的中间件\u003C\u002Fh3>\n\u003Cp>默认路由使用了 Logger(), Recovery()全局作用了两个中间件。\u003C\u002Fp>\n\u003Cdiv class=\"ssr-code-block\" data-lang=\"go\">\u003Cdiv class=\"ssr-code-head\">\u003Cspan class=\"ssr-code-lang\">go\u003C\u002Fspan>\u003Cdiv class=\"ssr-code-actions\">\u003Cbutton class=\"ssr-code-fullscreen ssr-code-iconbtn\" type=\"button\" aria-label=\"全屏查看代码\" title=\"全屏\">\u003Csvg viewBox=\"0 0 24 24\" width=\"17\" height=\"17\" aria-hidden=\"true\">\u003Cpath fill=\"currentColor\" d=\"M5 5h6v2H7v4H5V5zm14 0v6h-2V7h-4V5h6zM5 19v-6h2v4h4v2H5zm14 0h-6v-2h4v-4h2v6z\"\u002F>\u003C\u002Fsvg>\u003C\u002Fbutton>\u003Cbutton class=\"ssr-code-copy ssr-code-iconbtn\" type=\"button\" aria-label=\"复制代码\" title=\"复制\">\u003Csvg class=\"ssr-code-copy-icon ssr-code-copy-icon--default\" viewBox=\"0 0 24 24\" width=\"15\" height=\"15\" aria-hidden=\"true\">\u003Cpath fill=\"currentColor\" d=\"M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z\"\u002F>\u003C\u002Fsvg>\u003Csvg class=\"ssr-code-copy-icon ssr-code-copy-icon--success\" viewBox=\"0 0 24 24\" width=\"15\" height=\"15\" aria-hidden=\"true\">\u003Cpath fill=\"currentColor\" d=\"M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z\"\u002F>\u003C\u002Fsvg>\u003Csvg class=\"ssr-code-copy-icon ssr-code-copy-icon--error\" viewBox=\"0 0 24 24\" width=\"15\" height=\"15\" aria-hidden=\"true\">\u003Cpath fill=\"currentColor\" d=\"M19 6.41L17.59 5 12 10.59 6.41 5 5 6.41 10.59 12 5 17.59 6.41 19 12 13.41 17.59 19 19 17.59 13.41 12z\"\u002F>\u003C\u002Fsvg>\u003C\u002Fbutton>\u003C\u002Fdiv>\u003C\u002Fdiv>\u003Cdiv class=\"ssr-code-body\">\u003Cdiv class=\"ssr-code-pane\">\u003Cdiv class=\"ssr-code-gutter\" aria-hidden=\"true\">\u003Cspan class=\"ssr-code-num\">1\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">2\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">3\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">4\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">5\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">6\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">7\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">8\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">9\u003C\u002Fspan>\u003C\u002Fdiv>\u003Cpre class=\"ssr-code-pre\">\u003Ccode class=\"hljs language-go\">\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">r\u003C\u002Fspan>\u003Cspan style=\"color:#F97583\">:=\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">gin.\u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">Default\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">()\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">​\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#6A737D\">\u002F\u002FDefault()的定义：\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#F97583\">func\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\"> \u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">Default\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">() \u003C\u002Fspan>\u003Cspan style=\"color:#F97583\">*\u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">Engine\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\"> {\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">    \u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">debugPrintWARNINGDefault\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">()\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">    engine \u003C\u002Fspan>\u003Cspan style=\"color:#F97583\">:=\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\"> \u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">New\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">()\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">    engine.\u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">Use\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">(\u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">Logger\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">(), \u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">Recovery\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">())\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">    \u003C\u002Fspan>\u003Cspan style=\"color:#F97583\">return\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\"> engine\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">}\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fcode>\u003C\u002Fpre>\u003C\u002Fdiv>\u003C\u002Fdiv>\u003C\u002Fdiv>\n\u003Ch2 id=\"h2-7-\">注册中间件\u003C\u002Fh2>\n\u003Ch3 id=\"h3-8-\">为全局注册中间件\u003C\u002Fh3>\n\u003Cdiv class=\"ssr-code-block\" data-lang=\"go\">\u003Cdiv class=\"ssr-code-head\">\u003Cspan class=\"ssr-code-lang\">go\u003C\u002Fspan>\u003Cdiv class=\"ssr-code-actions\">\u003Cbutton class=\"ssr-code-fullscreen ssr-code-iconbtn\" type=\"button\" aria-label=\"全屏查看代码\" title=\"全屏\">\u003Csvg viewBox=\"0 0 24 24\" width=\"17\" height=\"17\" aria-hidden=\"true\">\u003Cpath fill=\"currentColor\" d=\"M5 5h6v2H7v4H5V5zm14 0v6h-2V7h-4V5h6zM5 19v-6h2v4h4v2H5zm14 0h-6v-2h4v-4h2v6z\"\u002F>\u003C\u002Fsvg>\u003C\u002Fbutton>\u003Cbutton class=\"ssr-code-copy ssr-code-iconbtn\" type=\"button\" aria-label=\"复制代码\" title=\"复制\">\u003Csvg class=\"ssr-code-copy-icon ssr-code-copy-icon--default\" viewBox=\"0 0 24 24\" width=\"15\" height=\"15\" aria-hidden=\"true\">\u003Cpath fill=\"currentColor\" d=\"M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z\"\u002F>\u003C\u002Fsvg>\u003Csvg class=\"ssr-code-copy-icon ssr-code-copy-icon--success\" viewBox=\"0 0 24 24\" width=\"15\" height=\"15\" aria-hidden=\"true\">\u003Cpath fill=\"currentColor\" d=\"M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z\"\u002F>\u003C\u002Fsvg>\u003Csvg class=\"ssr-code-copy-icon ssr-code-copy-icon--error\" viewBox=\"0 0 24 24\" width=\"15\" height=\"15\" aria-hidden=\"true\">\u003Cpath fill=\"currentColor\" d=\"M19 6.41L17.59 5 12 10.59 6.41 5 5 6.41 10.59 12 5 17.59 6.41 19 12 13.41 17.59 19 19 17.59 13.41 12z\"\u002F>\u003C\u002Fsvg>\u003C\u002Fbutton>\u003C\u002Fdiv>\u003C\u002Fdiv>\u003Cdiv class=\"ssr-code-body\">\u003Cdiv class=\"ssr-code-pane\">\u003Cdiv class=\"ssr-code-gutter\" aria-hidden=\"true\">\u003Cspan class=\"ssr-code-num\">1\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">2\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">3\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">4\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">5\u003C\u002Fspan>\u003C\u002Fdiv>\u003Cpre class=\"ssr-code-pre\">\u003Ccode class=\"hljs language-go\">\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">r \u003C\u002Fspan>\u003Cspan style=\"color:#F97583\">:=\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\"> gin.\u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">Default\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">()\u003C\u002Fspan>\u003Cspan style=\"color:#6A737D\">\u002F\u002F全局中间件的注册\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">​\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">r.\u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">Use\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">(\u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">Cost\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">())\u003C\u002Fspan>\u003Cspan style=\"color:#6A737D\">\u002F\u002F全局中间件的注册\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">​\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">r.\u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">GET\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">(\u003C\u002Fspan>\u003Cspan style=\"color:#9ECBFF\">"\u002Fmiddleware"\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">, M2)\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fcode>\u003C\u002Fpre>\u003C\u002Fdiv>\u003C\u002Fdiv>\u003C\u002Fdiv>\n\u003Ch3 id=\"h3-9-\">为路由组注册中间件\u003C\u002Fh3>\n\u003Cp>\u003Cstrong>写法 1：\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cdiv class=\"ssr-code-block\" data-lang=\"go\">\u003Cdiv class=\"ssr-code-head\">\u003Cspan class=\"ssr-code-lang\">go\u003C\u002Fspan>\u003Cdiv class=\"ssr-code-actions\">\u003Cbutton class=\"ssr-code-fullscreen ssr-code-iconbtn\" type=\"button\" aria-label=\"全屏查看代码\" title=\"全屏\">\u003Csvg viewBox=\"0 0 24 24\" width=\"17\" height=\"17\" aria-hidden=\"true\">\u003Cpath fill=\"currentColor\" d=\"M5 5h6v2H7v4H5V5zm14 0v6h-2V7h-4V5h6zM5 19v-6h2v4h4v2H5zm14 0h-6v-2h4v-4h2v6z\"\u002F>\u003C\u002Fsvg>\u003C\u002Fbutton>\u003Cbutton class=\"ssr-code-copy ssr-code-iconbtn\" type=\"button\" aria-label=\"复制代码\" title=\"复制\">\u003Csvg class=\"ssr-code-copy-icon ssr-code-copy-icon--default\" viewBox=\"0 0 24 24\" width=\"15\" height=\"15\" aria-hidden=\"true\">\u003Cpath fill=\"currentColor\" d=\"M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z\"\u002F>\u003C\u002Fsvg>\u003Csvg class=\"ssr-code-copy-icon ssr-code-copy-icon--success\" viewBox=\"0 0 24 24\" width=\"15\" height=\"15\" aria-hidden=\"true\">\u003Cpath fill=\"currentColor\" d=\"M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z\"\u002F>\u003C\u002Fsvg>\u003Csvg class=\"ssr-code-copy-icon ssr-code-copy-icon--error\" viewBox=\"0 0 24 24\" width=\"15\" height=\"15\" aria-hidden=\"true\">\u003Cpath fill=\"currentColor\" d=\"M19 6.41L17.59 5 12 10.59 6.41 5 5 6.41 10.59 12 5 17.59 6.41 19 12 13.41 17.59 19 19 17.59 13.41 12z\"\u002F>\u003C\u002Fsvg>\u003C\u002Fbutton>\u003C\u002Fdiv>\u003C\u002Fdiv>\u003Cdiv class=\"ssr-code-body\">\u003Cdiv class=\"ssr-code-pane\">\u003Cdiv class=\"ssr-code-gutter\" aria-hidden=\"true\">\u003Cspan class=\"ssr-code-num\">1\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">2\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">3\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">4\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">5\u003C\u002Fspan>\u003C\u002Fdiv>\u003Cpre class=\"ssr-code-pre\">\u003Ccode class=\"hljs language-go\">\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">shopGroup \u003C\u002Fspan>\u003Cspan style=\"color:#F97583\">:=\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\"> r.\u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">Group\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">(\u003C\u002Fspan>\u003Cspan style=\"color:#9ECBFF\">"\u002Fshop"\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">, \u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">Cost\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">())\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">{\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">    shopGroup.\u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">GET\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">(\u003C\u002Fspan>\u003Cspan style=\"color:#9ECBFF\">"\u002Findex"\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">, \u003C\u002Fspan>\u003Cspan style=\"color:#F97583\">func\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">(\u003C\u002Fspan>\u003Cspan style=\"color:#FFAB70\">c\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\"> \u003C\u002Fspan>\u003Cspan style=\"color:#F97583\">*\u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">gin\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">.\u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">Context\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">) {\u003C\u002Fspan>\u003Cspan style=\"color:#F97583\">...\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">})\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">    \u003C\u002Fspan>\u003Cspan style=\"color:#F97583\">...\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">}\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fcode>\u003C\u002Fpre>\u003C\u002Fdiv>\u003C\u002Fdiv>\u003C\u002Fdiv>\n\u003Cp>\u003Cstrong>写法 2：\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cdiv class=\"ssr-code-block\" data-lang=\"go\">\u003Cdiv class=\"ssr-code-head\">\u003Cspan class=\"ssr-code-lang\">go\u003C\u002Fspan>\u003Cdiv class=\"ssr-code-actions\">\u003Cbutton class=\"ssr-code-fullscreen ssr-code-iconbtn\" type=\"button\" aria-label=\"全屏查看代码\" title=\"全屏\">\u003Csvg viewBox=\"0 0 24 24\" width=\"17\" height=\"17\" aria-hidden=\"true\">\u003Cpath fill=\"currentColor\" d=\"M5 5h6v2H7v4H5V5zm14 0v6h-2V7h-4V5h6zM5 19v-6h2v4h4v2H5zm14 0h-6v-2h4v-4h2v6z\"\u002F>\u003C\u002Fsvg>\u003C\u002Fbutton>\u003Cbutton class=\"ssr-code-copy ssr-code-iconbtn\" type=\"button\" aria-label=\"复制代码\" title=\"复制\">\u003Csvg class=\"ssr-code-copy-icon ssr-code-copy-icon--default\" viewBox=\"0 0 24 24\" width=\"15\" height=\"15\" aria-hidden=\"true\">\u003Cpath fill=\"currentColor\" d=\"M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z\"\u002F>\u003C\u002Fsvg>\u003Csvg class=\"ssr-code-copy-icon ssr-code-copy-icon--success\" viewBox=\"0 0 24 24\" width=\"15\" height=\"15\" aria-hidden=\"true\">\u003Cpath fill=\"currentColor\" d=\"M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z\"\u002F>\u003C\u002Fsvg>\u003Csvg class=\"ssr-code-copy-icon ssr-code-copy-icon--error\" viewBox=\"0 0 24 24\" width=\"15\" height=\"15\" aria-hidden=\"true\">\u003Cpath fill=\"currentColor\" d=\"M19 6.41L17.59 5 12 10.59 6.41 5 5 6.41 10.59 12 5 17.59 6.41 19 12 13.41 17.59 19 19 17.59 13.41 12z\"\u002F>\u003C\u002Fsvg>\u003C\u002Fbutton>\u003C\u002Fdiv>\u003C\u002Fdiv>\u003Cdiv class=\"ssr-code-body\">\u003Cdiv class=\"ssr-code-pane\">\u003Cdiv class=\"ssr-code-gutter\" aria-hidden=\"true\">\u003Cspan class=\"ssr-code-num\">1\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">2\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">3\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">4\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">5\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">6\u003C\u002Fspan>\u003C\u002Fdiv>\u003Cpre class=\"ssr-code-pre\">\u003Ccode class=\"hljs language-go\">\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">shopGroup \u003C\u002Fspan>\u003Cspan style=\"color:#F97583\">:=\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\"> r.\u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">Group\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">(\u003C\u002Fspan>\u003Cspan style=\"color:#9ECBFF\">"\u002Fshop"\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">)\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">shopGroup.\u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">Use\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">(\u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">Cost\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">())\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">{\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">    shopGroup.\u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">GET\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">(\u003C\u002Fspan>\u003Cspan style=\"color:#9ECBFF\">"\u002Findex"\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">, \u003C\u002Fspan>\u003Cspan style=\"color:#F97583\">func\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">(\u003C\u002Fspan>\u003Cspan style=\"color:#FFAB70\">c\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\"> \u003C\u002Fspan>\u003Cspan style=\"color:#F97583\">*\u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">gin\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">.\u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">Context\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">) {\u003C\u002Fspan>\u003Cspan style=\"color:#F97583\">...\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">})\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">    \u003C\u002Fspan>\u003Cspan style=\"color:#F97583\">...\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">}\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fcode>\u003C\u002Fpre>\u003C\u002Fdiv>\u003C\u002Fdiv>\u003C\u002Fdiv>\n\u003Ch3 id=\"h3-10-\">为单个路由注册中间件\u003C\u002Fh3>\n\u003Cdiv class=\"ssr-code-block\" data-lang=\"go\">\u003Cdiv class=\"ssr-code-head\">\u003Cspan class=\"ssr-code-lang\">go\u003C\u002Fspan>\u003Cdiv class=\"ssr-code-actions\">\u003Cbutton class=\"ssr-code-fullscreen ssr-code-iconbtn\" type=\"button\" aria-label=\"全屏查看代码\" title=\"全屏\">\u003Csvg viewBox=\"0 0 24 24\" width=\"17\" height=\"17\" aria-hidden=\"true\">\u003Cpath fill=\"currentColor\" d=\"M5 5h6v2H7v4H5V5zm14 0v6h-2V7h-4V5h6zM5 19v-6h2v4h4v2H5zm14 0h-6v-2h4v-4h2v6z\"\u002F>\u003C\u002Fsvg>\u003C\u002Fbutton>\u003Cbutton class=\"ssr-code-copy ssr-code-iconbtn\" type=\"button\" aria-label=\"复制代码\" title=\"复制\">\u003Csvg class=\"ssr-code-copy-icon ssr-code-copy-icon--default\" viewBox=\"0 0 24 24\" width=\"15\" height=\"15\" aria-hidden=\"true\">\u003Cpath fill=\"currentColor\" d=\"M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z\"\u002F>\u003C\u002Fsvg>\u003Csvg class=\"ssr-code-copy-icon ssr-code-copy-icon--success\" viewBox=\"0 0 24 24\" width=\"15\" height=\"15\" aria-hidden=\"true\">\u003Cpath fill=\"currentColor\" d=\"M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z\"\u002F>\u003C\u002Fsvg>\u003Csvg class=\"ssr-code-copy-icon ssr-code-copy-icon--error\" viewBox=\"0 0 24 24\" width=\"15\" height=\"15\" aria-hidden=\"true\">\u003Cpath fill=\"currentColor\" d=\"M19 6.41L17.59 5 12 10.59 6.41 5 5 6.41 10.59 12 5 17.59 6.41 19 12 13.41 17.59 19 19 17.59 13.41 12z\"\u002F>\u003C\u002Fsvg>\u003C\u002Fbutton>\u003C\u002Fdiv>\u003C\u002Fdiv>\u003Cdiv class=\"ssr-code-body\">\u003Cdiv class=\"ssr-code-pane\">\u003Cdiv class=\"ssr-code-gutter\" aria-hidden=\"true\">\u003Cspan class=\"ssr-code-num\">1\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">2\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">3\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">4\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">5\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">6\u003C\u002Fspan>\u003C\u002Fdiv>\u003Cpre class=\"ssr-code-pre\">\u003Ccode class=\"hljs language-go\">\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">r.\u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">GET\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">(\u003C\u002Fspan>\u003Cspan style=\"color:#9ECBFF\">"\u002Ftest"\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">, \u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">Cost\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">(), \u003C\u002Fspan>\u003Cspan style=\"color:#F97583\">func\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">(\u003C\u002Fspan>\u003Cspan style=\"color:#FFAB70\">c\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\"> \u003C\u002Fspan>\u003Cspan style=\"color:#F97583\">*\u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">gin\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">.\u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">Context\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">) {\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">    name \u003C\u002Fspan>\u003Cspan style=\"color:#F97583\">:=\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\"> c.\u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">MustGet\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">(\u003C\u002Fspan>\u003Cspan style=\"color:#9ECBFF\">"name"\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">).(\u003C\u002Fspan>\u003Cspan style=\"color:#F97583\">string\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">) \u003C\u002Fspan>\u003Cspan style=\"color:#6A737D\">\u002F\u002F 从上下文取值，MustGet()如果取不到值就会panic。MustGet()没有bool值的返回。\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">    c.\u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">JSON\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">(http.StatusOK, \u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">gin\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">.\u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">H\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">{\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">        \u003C\u002Fspan>\u003Cspan style=\"color:#9ECBFF\">"name"\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">: name,\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">    })\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">})\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fcode>\u003C\u002Fpre>\u003C\u002Fdiv>\u003C\u002Fdiv>\u003C\u002Fdiv>\n\u003Ch2 id=\"h2-11--goroutine\">在中间件中使用 Goroutine\u003C\u002Fh2>\n\u003Cp>当在中间件或 handler 中启动新的 Goroutine 时，\u003Cstrong>不能\u003C\u002Fstrong>使用原始的上下文，必须使用只读副本。\u003C\u002Fp>\n\u003Cdiv class=\"ssr-code-block\" data-lang=\"go\" data-collapsible=\"true\" data-collapsed=\"true\" data-line-count=\"31\">\u003Cdiv class=\"ssr-code-head\">\u003Cspan class=\"ssr-code-lang\">go\u003C\u002Fspan>\u003Cdiv class=\"ssr-code-actions\">\u003Cbutton class=\"ssr-code-toggle ssr-code-toggle--head ssr-code-iconbtn\" type=\"button\" aria-expanded=\"true\" aria-label=\"收起代码\" title=\"收起\">\u003Csvg viewBox=\"0 0 24 24\" width=\"19\" height=\"19\" aria-hidden=\"true\">\u003Cpath fill=\"currentColor\" d=\"M12 8.59l-6.3 6.3 1.4 1.42L12 11.4l4.9 4.9 1.4-1.4z\"\u002F>\u003C\u002Fsvg>\u003C\u002Fbutton>\u003Cbutton class=\"ssr-code-toggle ssr-code-toggle--head-expand ssr-code-iconbtn\" type=\"button\" aria-expanded=\"false\" aria-label=\"展开代码\" title=\"展开\">\u003Csvg viewBox=\"0 0 24 24\" width=\"19\" height=\"19\" aria-hidden=\"true\">\u003Cpath fill=\"currentColor\" d=\"M12 15.41l6.3-6.3-1.4-1.42L12 12.59 7.1 7.7l-1.4 1.4z\"\u002F>\u003C\u002Fsvg>\u003C\u002Fbutton>\u003Cbutton class=\"ssr-code-fullscreen ssr-code-iconbtn\" type=\"button\" aria-label=\"全屏查看代码\" title=\"全屏\">\u003Csvg viewBox=\"0 0 24 24\" width=\"17\" height=\"17\" aria-hidden=\"true\">\u003Cpath fill=\"currentColor\" d=\"M5 5h6v2H7v4H5V5zm14 0v6h-2V7h-4V5h6zM5 19v-6h2v4h4v2H5zm14 0h-6v-2h4v-4h2v6z\"\u002F>\u003C\u002Fsvg>\u003C\u002Fbutton>\u003Cbutton class=\"ssr-code-copy ssr-code-iconbtn\" type=\"button\" aria-label=\"复制代码\" title=\"复制\">\u003Csvg class=\"ssr-code-copy-icon ssr-code-copy-icon--default\" viewBox=\"0 0 24 24\" width=\"15\" height=\"15\" aria-hidden=\"true\">\u003Cpath fill=\"currentColor\" d=\"M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z\"\u002F>\u003C\u002Fsvg>\u003Csvg class=\"ssr-code-copy-icon ssr-code-copy-icon--success\" viewBox=\"0 0 24 24\" width=\"15\" height=\"15\" aria-hidden=\"true\">\u003Cpath fill=\"currentColor\" d=\"M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z\"\u002F>\u003C\u002Fsvg>\u003Csvg class=\"ssr-code-copy-icon ssr-code-copy-icon--error\" viewBox=\"0 0 24 24\" width=\"15\" height=\"15\" aria-hidden=\"true\">\u003Cpath fill=\"currentColor\" d=\"M19 6.41L17.59 5 12 10.59 6.41 5 5 6.41 10.59 12 5 17.59 6.41 19 12 13.41 17.59 19 19 17.59 13.41 12z\"\u002F>\u003C\u002Fsvg>\u003C\u002Fbutton>\u003C\u002Fdiv>\u003C\u002Fdiv>\u003Cdiv class=\"ssr-code-body\">\u003Cdiv class=\"ssr-code-pane\">\u003Cdiv class=\"ssr-code-gutter\" aria-hidden=\"true\">\u003Cspan class=\"ssr-code-num\">1\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">2\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">3\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">4\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">5\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">6\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">7\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">8\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">9\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">10\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">11\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">12\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">13\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">14\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">15\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">16\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">17\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">18\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">19\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">20\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">21\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">22\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">23\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">24\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">25\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">26\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">27\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">28\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">29\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">30\u003C\u002Fspan>\u003Cspan class=\"ssr-code-num\">31\u003C\u002Fspan>\u003C\u002Fdiv>\u003Cpre class=\"ssr-code-pre\">\u003Ccode class=\"hljs language-go\">\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#F97583\">func\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\"> \u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">M1\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">() \u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">gin\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">.\u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">HandlerFunc\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\"> {\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">    \u003C\u002Fspan>\u003Cspan style=\"color:#F97583\">return\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\"> \u003C\u002Fspan>\u003Cspan style=\"color:#F97583\">func\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">(\u003C\u002Fspan>\u003Cspan style=\"color:#FFAB70\">c\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\"> \u003C\u002Fspan>\u003Cspan style=\"color:#F97583\">*\u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">gin\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">.\u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">Context\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">) {\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">        c.\u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">Set\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">(\u003C\u002Fspan>\u003Cspan style=\"color:#9ECBFF\">"name"\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">, \u003C\u002Fspan>\u003Cspan style=\"color:#9ECBFF\">"bing"\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">)\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">        ctxCopy \u003C\u002Fspan>\u003Cspan style=\"color:#F97583\">:=\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\"> c.\u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">Copy\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">() \u003C\u002Fspan>\u003Cspan style=\"color:#6A737D\">\u002F\u002F得到上下文的副本\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">        \u003C\u002Fspan>\u003Cspan style=\"color:#F97583\">go\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\"> \u003C\u002Fspan>\u003Cspan style=\"color:#F97583\">func\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">() {\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">            \u003C\u002Fspan>\u003Cspan style=\"color:#6A737D\">\u002F\u002F 使用的是复制的上下文:ctxCopy\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">            time.\u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">Sleep\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">(\u003C\u002Fspan>\u003Cspan style=\"color:#79B8FF\">3\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\"> \u003C\u002Fspan>\u003Cspan style=\"color:#F97583\">*\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\"> time.Second)\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">            goRoutinePath \u003C\u002Fspan>\u003Cspan style=\"color:#F97583\">:=\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\"> ctxCopy.Request.URL.Path\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">            \u003C\u002Fspan>\u003Cspan style=\"color:#6A737D\">\u002F\u002Fgoroutine结束后ctxCopy就会被销毁\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">            log.\u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">Println\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">(goRoutinePath)\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">        }()\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">    }\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">}\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#F97583\">func\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\"> \u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">M2\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">(\u003C\u002Fspan>\u003Cspan style=\"color:#FFAB70\">c\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\"> \u003C\u002Fspan>\u003Cspan style=\"color:#F97583\">*\u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">gin\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">.\u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">Context\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">) {\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">    name \u003C\u002Fspan>\u003Cspan style=\"color:#F97583\">:=\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\"> c.\u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">MustGet\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">(\u003C\u002Fspan>\u003Cspan style=\"color:#9ECBFF\">"name"\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">)\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">    path \u003C\u002Fspan>\u003Cspan style=\"color:#F97583\">:=\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\"> c.Request.URL.Path\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">    c.\u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">JSON\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">(http.StatusOK, \u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">gin\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">.\u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">H\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">{\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">        \u003C\u002Fspan>\u003Cspan style=\"color:#9ECBFF\">"name"\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">: name,\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">        \u003C\u002Fspan>\u003Cspan style=\"color:#9ECBFF\">"Path"\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">: path,\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">    })\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">}\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#F97583\">func\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\"> \u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">main\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">() {\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">    r \u003C\u002Fspan>\u003Cspan style=\"color:#F97583\">:=\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\"> gin.\u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">Default\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">()\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">    r.\u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">Use\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">(\u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">M1\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">())\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">    r.\u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">GET\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">(\u003C\u002Fspan>\u003Cspan style=\"color:#9ECBFF\">"\u002Fmiddleware"\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">, M2)\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">    err \u003C\u002Fspan>\u003Cspan style=\"color:#F97583\">:=\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\"> r.\u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">Run\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">(\u003C\u002Fspan>\u003Cspan style=\"color:#9ECBFF\">"127.0.0.1:8080"\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">)\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">    \u003C\u002Fspan>\u003Cspan style=\"color:#F97583\">if\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\"> err \u003C\u002Fspan>\u003Cspan style=\"color:#F97583\">=\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\"> \u003C\u002Fspan>\u003Cspan style=\"color:#79B8FF\">nil\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\"> {\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">        fmt.\u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">Println\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">(err.\u003C\u002Fspan>\u003Cspan style=\"color:#B392F0\">Error\u003C\u002Fspan>\u003Cspan style=\"color:#E1E4E8\">())\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">    }\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">\u003Cspan style=\"color:#E1E4E8\">}\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ssr-code-line\">​\u003C\u002Fspan>\u003C\u002Fcode>\u003C\u002Fpre>\u003C\u002Fdiv>\u003Cdiv class=\"ssr-code-mask\" aria-hidden=\"true\">\u003C\u002Fdiv>\u003Cbutton class=\"ssr-code-toggle ssr-code-toggle--floating\" type=\"button\" aria-expanded=\"false\">展开全部 (31 行)\u003C\u002Fbutton>\u003C\u002Fdiv>\u003C\u002Fdiv>\n\u003Ch5 id=\"h5-12-\">结果如下：\u003C\u002Fh5>\n\u003Cp>\u003Cimg class=\"article-img article-img-zoomable\" src=\"https:\u002F\u002Fliubing-1314895948.cos.ap-chengdu.myqcloud.com\u002Fimg\u002F202303311331073.png\" alt=\"image-20230331133149995\" loading=\"lazy\" decoding=\"async\" style=\"width: 100%; height: auto; max-width: 100%; display: block;\" srcset=\"https:\u002F\u002Fliubing-1314895948.cos.ap-chengdu.myqcloud.com\u002Fimg\u002F202303311331073.png?imageMogr2\u002Fthumbnail\u002F400x\u002Fformat\u002Fwebp\u002Fquality\u002F85 400w, https:\u002F\u002Fliubing-1314895948.cos.ap-chengdu.myqcloud.com\u002Fimg\u002F202303311331073.png?imageMogr2\u002Fthumbnail\u002F800x\u002Fformat\u002Fwebp\u002Fquality\u002F85 800w, https:\u002F\u002Fliubing-1314895948.cos.ap-chengdu.myqcloud.com\u002Fimg\u002F202303311331073.png?imageMogr2\u002Fthumbnail\u002F1200x\u002Fformat\u002Fwebp\u002Fquality\u002F85 1200w, https:\u002F\u002Fliubing-1314895948.cos.ap-chengdu.myqcloud.com\u002Fimg\u002F202303311331073.png?imageMogr2\u002Fthumbnail\u002F1920x\u002Fformat\u002Fwebp\u002Fquality\u002F85 1920w\" sizes=\"(max-width: 576px) 100vw, (max-width: 992px) 90vw, 720px\">\u003C\u002Fp>\n\u003Cp>\u003Cimg class=\"article-img article-img-zoomable\" src=\"https:\u002F\u002Fliubing-1314895948.cos.ap-chengdu.myqcloud.com\u002Fimg\u002F202303311332475.png\" alt=\"image-20230331133209363\" loading=\"lazy\" decoding=\"async\" style=\"width: 100%; height: auto; max-width: 100%; display: block;\" srcset=\"https:\u002F\u002Fliubing-1314895948.cos.ap-chengdu.myqcloud.com\u002Fimg\u002F202303311332475.png?imageMogr2\u002Fthumbnail\u002F400x\u002Fformat\u002Fwebp\u002Fquality\u002F85 400w, https:\u002F\u002Fliubing-1314895948.cos.ap-chengdu.myqcloud.com\u002Fimg\u002F202303311332475.png?imageMogr2\u002Fthumbnail\u002F800x\u002Fformat\u002Fwebp\u002Fquality\u002F85 800w, https:\u002F\u002Fliubing-1314895948.cos.ap-chengdu.myqcloud.com\u002Fimg\u002F202303311332475.png?imageMogr2\u002Fthumbnail\u002F1200x\u002Fformat\u002Fwebp\u002Fquality\u002F85 1200w, https:\u002F\u002Fliubing-1314895948.cos.ap-chengdu.myqcloud.com\u002Fimg\u002F202303311332475.png?imageMogr2\u002Fthumbnail\u002F1920x\u002Fformat\u002Fwebp\u002Fquality\u002F85 1920w\" sizes=\"(max-width: 576px) 100vw, (max-width: 992px) 90vw, 720px\">\u003C\u002Fp>\n","Gin 框架允许开发者在处理请求的过程中，加入用户自己的钩子（Hook）函数。这个钩子函数就叫中间件，中间件适合处理一些公共的业务逻辑，比如登录认证、权限校验、数据分页、记录日志、耗时统计等。 定义中间件 Gin 中的中间件必须是一个 gin.HandlerFunc 类型。 洋葱模型 看上图，我们的中间件就相当于一层一","https:\u002F\u002Fliubing-1314895948.cos.ap-chengdu.myqcloud.com\u002Fimg\u002F202303311331073.png"]