在go文件服务器加入http.StripPrefix的用途介绍
时间：2021-04-06 10:03:11|栏目：Golang|点击： 次
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 main
import (
"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))
}
}
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