在go檔案伺服器加入http.StripPrefix的用途介紹
阿新 • • 發佈:2020-12-19
例子:
http.Handle("/tmpfiles/",http.StripPrefix("/tmpfiles/",http.FileServer(http.Dir("/tmp"))))
當訪問localhost:xxxx/tmpfiles時,會路由到fileserver進行處理
當訪問URL為/tmpfiles/example.txt時,fileserver會將/tmp與URL進行拼接,得到/tmp/tmpfiles/example.txt,而實際上example.txt的地址是/tmp/example.txt,因此這樣將訪問不到相應的檔案,返回404 NOT FOUND。
因此解決方案就是把URL中的/tmpfiles/去掉,而http.StripPrefix做的就是這個。
補充:go語言實現一個簡單的檔案伺服器 http.FileServer
程式碼如下:
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,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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