doumo6356
2018-12-21 17:38
浏览 103
已采纳

在ListenAndServe内部调用多个句柄

I want to use multiple handlers inside the ListenAndServe method from the http package. For example:

if err := http.ListenAndServe(":"+s.config.Port,
    handlers.LoggingHandler(os.Stdout, s.router),
    handlers.CORS()(r.router)
); err != nil {

Problem:

Everytime I'm getting the following error:

pkg/server/server.go:30:31: too many arguments in call to http.ListenAndServe have (string, http.Handler, http.Handler) want (string, http.Handler) pkg/server/server.go:30:113: undefined: r

Question:

Now it's not accepting more than 2 arguments, so is there any alternative of doing this?

图片转代码服务由CSDN问答提供 功能建议

我想在 http <的 ListenAndServe 方法内使用多个处理程序 / code>包。 例如:

  if err:= http.ListenAndServe(“:” + s.config.Port,
 handlers.LoggingHandler(os.Stdout,s.router),  
 handlers.CORS()(r.router)
);  err!= nil {
   
 
 

问题:

每次我遇到以下错误 :

pkg / server / server.go:30:31:调用 http.ListenAndServe的参数过多(字符串,http.Handler,http。 处理程序)want (字符串,http.Handler)pkg / server / server.go:30:113:undefined:r

问题:< / strong>

现在它不接受两个以上的参数,那么还有其他选择吗?

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1条回答 默认 最新

  • duanlan5320 2018-12-21 17:52
    已采纳

    ListenAndServe only takes a single http.Handler.

    The simplest way to do this without bringing in a library is to build a http.Handler that encompasses both:

    func simpleChain(hs ...http.Handler) http.Handler {
      return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request){
        for _, h := range hs {
          h.ServeHTTP(w, r)
        }
      })
    }
    

    This has some problems though if any of the handlers want to do something to the Request.Body or write to the ResponseWriter.

    For example, you might want a handler to check if the request has permission and then prevent the other handlers from getting invoked. This implies that the ResponseWriter's status code needs to be checked. I would say bring in a library at this point.

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