How do I redirect from an exact url in golang?

Question

Whenever a request is made from localhost:9000/ I want to redirect the user to localhost:9000/#/trade/gem/GEM . The problem I am getting is that I get infinite redirects because "/" preceeds every url. How do I make it so that the user is only redirected if they visit the exact url of localhost:9000/ ? My code is below:

var newUrl string = "/#/trade/gem/GEM"

func handleRedirect(rw http.ResponseWriter, req *http.Request) {
    http.Redirect(rw, req, newUrl, http.StatusSeeOther)
}

func main() {
    http.Handle("/#/trade/", fs)
    http.HandleFunc("/", handleRedirect) //This is the exact url I want to redirect from
    http.ListenAndServe(":9000", nil)
}

The fragment (everything after the #) is not transmitted to the server. You'll have pick a different approach. — user142162
– user142162, Commented Aug 24, 2018 at 0:15
What does this have to do with my question? I am only interested in redirecting the exact url of "localhost:9000/". Whether or not I use a hash in the url to redirect to shouldn't make a difference should it? — user9760741
– user9760741, Commented Aug 24, 2018 at 2:22
@cookiekid, you cannot tell the difference between / and /#/trade/gem/GEM on the server; they both look like /, hence the redirect loop. The fragment is for client-side use only (i.e. JavaScript). — Peter
– Peter, Commented Aug 24, 2018 at 5:56
Oh ok. Thanks. So I have to do the redirect on the frontend then. I think React Router has a tool for that anyway. — user9760741
– user9760741, Commented Aug 25, 2018 at 17:13

Hamza Anis · Accepted Answer · 2018-08-24 18:19:23Z

1

When the / is registered then all the url will redirect to this until the other pattern is not registered.To solve this and handling only specific patterns you can write a custom handler and you can implement a logic where it redirects to the specific url whenever the localhost:9000/ is opened.

package main

import (
    "fmt"
    "net/http"
)

type Handler struct{}

var NewUrl string = "/trade/gem/GEM"

func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
    uri := r.URL.Path
    if uri == "/" {
        http.Redirect(w, r, NewUrl, http.StatusSeeOther)
    }
    fmt.Fprintf(w, uri)
    return
}

func main() {
    handler := new(Handler)
    http.ListenAndServe(":9000", handler)
}

For more details check http.handler

Note: You can not use # in the uri.

edited Aug 24, 2018 at 18:19

answered Aug 24, 2018 at 5:13

Hamza Anis

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