The problem I'm seeing is that I'm trying to use the http.FileServer with the Gorilla mux Router.Handle function.
This doesn't work (the image returns a 404)..
myRouter := mux.NewRouter()
myRouter.Handle("/images/", http.StripPrefix("/images/", http.FileServer(http.Dir(HomeFolder + "images/"))))
this works (the image is shown ok)..
http.Handle("/images/", http.StripPrefix("/images/", http.FileServer(http.Dir(HomeFolder + "images/"))))
Simple go web server program below, showing the problem...
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>
`
I posted this on golang-nuts discussion group and got this solution from Toni Cárdenas ...
The standard net/http ServeMux (which is the standard handler you are using when you use http.Handle) and the mux Router have different ways of matching an address.
See the differences between http://golang.org/pkg/net/http/#ServeMux and http://godoc.org/github.com/gorilla/mux.
So basically, http.Handle('/images/', ...) matches '/images/whatever', while myRouter.Handle('/images/', ...) only matches '/images/', and if you want to handle '/images/whatever', you have to ...
Option 1 - Use a regular expression match in your router
myRouter.Handle("/images/{rest}",
http.StripPrefix("/images/", http.FileServer(http.Dir(HomeFolder + "images/"))))
Option 2 - Use the PathPrefix method on your router:
myRouter.PathPrefix("/images/").Handler(http.StripPrefix("/images/",
http.FileServer(http.Dir(HomeFolder + "images/"))))
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