例子：

http.Handle("/tmpfiles/", http.StripPrefix("/tmpfiles/", http.FileServer(http.Dir("/tmp"))))

当访问localhost:xxxx/tmpfiles时，会路由到fileserver进行处理

当访问URL为/tmpfiles/example.txt时，fileserver会将/tmp与URL进行拼接，得到/tmp/tmpfiles/example.txt，而实际上example.txt的地址是/tmp/example.txt，因此这样将访问不到相应的文件，返回404 NOT FOUND。

因此解决方案就是把URL中的/tmpfiles/去掉，而http.StripPrefix做的就是这个。

补充：go语言实现一个简单的文件服务器 http.FileServer

代码如下：

package mainimport ( "flag" "fmt" "github.com/julienschmidt/httprouter" "log" "net/http" "strings" "time")func main() { root := flag.String("p", "", "file server root directory") flag.Parse() if len(*root) == 0 { log.Fatalln("file server root directory not set") } if !strings.HasPrefix(*root, "/") { log.Fatalln("file server root directory not begin with '/'") } if !strings.HasSuffix(*root, "/") { log.Fatalln("file server root directory not end with '/'") } p, h := NewFileHandle(*root) r := httprouter.New() r.GET(p, LogHandle(h)) log.Fatalln(http.ListenAndServe(":8080", r))}func NewFileHandle(path string) (string, httprouter.Handle) { return fmt.Sprintf("%s*files", path), func(w http.ResponseWriter, r *http.Request, p httprouter.Params) { http.StripPrefix(path, http.FileServer(http.Dir(path))).ServeHTTP(w, r) }}func LogHandle(handle httprouter.Handle) httprouter.Handle { return func(w http.ResponseWriter, r *http.Request, p httprouter.Params) { now := time.Now() handle(w, r, p) log.Printf("%s %s %s done in %v", r.RemoteAddr, r.Method, r.URL.Path, time.Since(now)) }}

准备测试文件

编译运行

用浏览器访问

以上为个人经验，希望能给大家一个参考，也希望大家多多支持。如有错误或未考虑完全的地方，望不吝赐教。