Golang Gorilla Mux与http.FileServer返回404

一尘不染

Golang Gorilla Mux与http.FileServer返回404

我看到的问题是我正在尝试http.FileServer将Gorilla mux Router.Handle函数与一起使用。

这不起作用（图像返回404）。

myRouter := mux.NewRouter()
myRouter.Handle("/images/", http.StripPrefix("/images/", http.FileServer(http.Dir(HomeFolder + "images/"))))

这有效（图像显示正常）。

http.Handle("/images/", http.StripPrefix("/images/", http.FileServer(http.Dir(HomeFolder + "images/"))))

下面简单的转到Web服务器程序，显示问题…

package main

import (
    "fmt"
    "net/http"
    "io"
    "log"
    "github.com/gorilla/mux"
)

const (
    HomeFolder = "/root/test/"
)

func HomeHandler(w http.ResponseWriter, req *http.Request) {
    io.WriteString(w, htmlContents)
}

func main() {

    myRouter := mux.NewRouter()
    myRouter.HandleFunc("/", HomeHandler)
    //
    // The next line, the image route handler results in 
    // the test.png image returning a 404.
    // myRouter.Handle("/images/", http.StripPrefix("/images/", http.FileServer(http.Dir(HomeFolder + "images/"))))
    //
    myRouter.Host("mydomain.com")
    http.Handle("/", myRouter)

    // This method of setting the image route handler works fine.
    // test.png is shown ok.
    http.Handle("/images/", http.StripPrefix("/images/", http.FileServer(http.Dir(HomeFolder + "images/"))))

    // HTTP - port 80
    err := http.ListenAndServe(":80", nil)

    if err != nil {
        log.Fatal("ListenAndServe: ", err)
        fmt.Printf("ListenAndServe:%s\n", err.Error())
    }
}

const htmlContents = `<!DOCTYPE HTML>
<html lang="en">
  <head>
    <title>Test page</title>
    <meta charset = "UTF-8" />
  </head>
  <body>
    <p align="center">
        <img src="/images/test.png" height="640" width="480">
    </p>
  </body>
</html>
`

阅读 469

2020-07-02

共1个答案

一尘不染

我将其发布在golang-nuts讨论组上，并从
ToniCárdenas获得了此解决方案 …

标准的net / http ServeMux（这是您在使用时使用的标准处理程序http.Handle）和多路复用器路由器具有不同的地址匹配方式。

查看 http://golang.org/pkg/net/http/#ServeMux和 http://godoc.org/github.com/gorilla/mux之间的区别。

因此，基本上，http.Handle('/images/', ...)匹配“ / images /
whatever”，而myRouter.Handle('/images/', ...) 仅匹配“ / images /”，如果要处理“ /
images / whatever”，则必须…

选项1- 在路由器中使用正则表达式匹配

myRouter.Handle("/images/{rest}",
     http.StripPrefix("/images/", http.FileServer(http.Dir(HomeFolder + "images/"))))

选项2- 在路由器上使用PathPrefix方法：

myRouter.PathPrefix("/images/").Handler(http.StripPrefix("/images/", 
     http.FileServer(http.Dir(HomeFolder + "images/"))))

2020-07-02