How to process GET operation (CRUD) in go lang via Postman? - http

Question

I want to perform a get operation. I am passng name as a resource to the URL.
The URL I am hitting in Postman is : localhost:8080/location/{titan rolex} ( I chose the GET method in the dropdown list)
On the URL hit in Postman, I am executing the GetUser func() with body as:
func GetUser(rw http.ResponseWriter, req *http.Request) {
}
Now I wish to get the resource value i.e 'titan rolex' in the GetUser method.
How can I achieve this in golang?
In main(), I have this :
http.HandleFunc("/location/{titan rolex}", GetUser)
Thanks in advance.

Answer 1

What you are doing is binding the complete path /location/{titan rolex} to be handled by GetUser.
What you really want is to bind /location/<every possible string> to be handled by one handler (e.g. LocationHandler).
You can do that with either the standard library or another router. I will present both ways:
Standard lib:
import (
"fmt"
"net/http"
"log"
)
func locationHandler(w http.ResponseWriter, r *http.Request) {
name := r.URL.Path[len("/location/"):]
fmt.Fprintf(w, "Location: %s\n", name)
}
func main() {
http.HandleFunc("/location/", locationHandler)
log.Fatal(http.ListenAndServe(":8080", nil))
}
Note however, more complex paths (such as /location/<every possible string>/<some int>/<another string>) will be tedious to implement this way.
The other way is to use github.com/julienschmidt/httprouter, especially if you encounter these situations more often (and have more complex paths).
Here's an example for your use case:
import (
"fmt"
"github.com/julienschmidt/httprouter"
"net/http"
"log"
)
func LocationHandler(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
fmt.Fprintf(w, "Location: %s\n", ps.ByName("loc"))
}
func main() {
router := httprouter.New()
router.GET("/location/:loc", LocationHandler)
log.Fatal(http.ListenAndServe(":8080", router))
}
Note that httprouter uses a slightly different signature for handlers. This is because, as you can see, it passes these parameters to the functions as well.
Oh and another note, you can just hit http://localhost:8080/location/titan rolex with your browser (or something else) - if that something else is decent enough, it will URLEncode that to be http://localhost:8080/location/titan%20rolex.