When I use
http.HandleFunc("/", serveRest) //serveRest is the method to handle request
http.ListenAndServe("localhost:4000", nil)
It will accept all request starting with "/". How do I restrict it to serve only "localhost:4000" instead of every address like "localhost:4000/*"?
And can you guys suggest me a good tutorial for Go?
The URL pattern to which you register your handlers is documented in the http.ServeMux type:
Patterns name fixed, rooted paths, like "/favicon.ico", or rooted subtrees, like "/images/" (note the trailing slash). Longer patterns take precedence over shorter ones, so that if there are handlers registered for both "/images/" and "/images/thumbnails/", the latter handler will be called for paths beginning "/images/thumbnails/" and the former will receive requests for any other paths in the "/images/" subtree.
Note that since a pattern ending in a slash names a rooted subtree, the pattern "/" matches all paths not matched by other registered patterns, not just the URL with Path == "/".
So unfortunately there is no pattern which matches only the root ("/").
But you can easily check this in your handler, and do whatever you want to if the request path is not the root:
func serveRest(w http.ResponseWriter, r *http.Request) {
if r.URL.Path != "/" {
w.Write([]byte("Not root!"))
return
}
w.Write([]byte("Hi, this is the root!"))
}
If you want to return HTTP 404 Not found error for non-roots:
func serveRest(w http.ResponseWriter, r *http.Request) {
if r.URL.Path != "/" {
http.NotFound(w, r)
return
}
w.Write([]byte("Hi!"))
}
And Go tutorial: https://tour.golang.org/
Also check out the Go tag info here on SO, it has a section Go Tutorials.
You could check out https://github.com/julienschmidt/httprouter
Per its readme:
Only explicit matches: With other routers, like http.ServeMux, a requested URL path could match multiple patterns. Therefore they have some awkward pattern priority rules, like longest match or first registered, first matched. By design of this router, a request can only match exactly one or no route. As a result, there are also no unintended matches, which makes it great for SEO and improves the user experience.
Here is some good video content to get started in Go.