我看到的问题是我正在尝试将 http.FileServer
与gorilla mux router.handle函数一起使用。
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(图像显示可以)..
http.Handle("/images/", http.StripPrefix("/images/", http.FileServer(http.Dir(HomeFolder + "images/"))))
下面简单的GO 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:%sn", 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>
`
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(使用http.Handle
时,您正在使用的标准处理程序)和MUX路由器具有匹配地址的不同方式。
请参阅http://golang.org/pkg/net/http/#servemux和http://godoc.org/github.com/gorilla/gorilla/mux.
基本上, http.Handle('/images/', ...)
匹配"/images/erthing',而 myRouter.Handle('/images/', ...)
唯一匹配'/images/',如果您想处理'/images/whthing',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 - 使用路由器上的PathPrefix方法:
myRouter.PathPrefix("/images/").Handler(http.StripPrefix("/images/",
http.FileServer(http.Dir(HomeFolder + "images/"))))
截至2015年5月,大猩猩/mux软件包仍然没有版本。但是问题现在有所不同。并不是说myRouter.Handle
与URL不匹配,并且需要Regexp,它确实如此!但是http.FileServer
需要从URL中删除前缀。下面的示例正常工作。
ui := http.FileServer(http.Dir("ui"))
myRouter.Handle("/ui/", http.StripPrefix("/ui/", ui))
注意,在abowe示例中没有/ui/ {reth} 。您也可以将http.FileServer
包装到Logger Gorilla/Handler中,并查看到Fileserver和响应404出门的请求。
ui := handlers.CombinedLoggingHandler(os.Stderr,http.FileServer(http.Dir("ui"))
myRouter.Handle("/ui/", ui) // getting 404
// works with strip: myRouter.Handle("/ui/", http.StripPrefix("/ui/", ui))