如何通过邮递员在Go lang中处理GET操作（CRUD）？

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:

1. 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
   ", 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.

2. 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
   ", 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.