Go: Get path parameters from http.Request

Question

I'm developing a REST API with Go, but I don't know how can I do the path mappings and retrieve the path parameters from them.

I want something like this:

func main() {
    http.HandleFunc("/provisions/:id", Provisions) //<-- How can I map "id" parameter in the path?
    http.ListenAndServe(":8080", nil)
}

func Provisions(w http.ResponseWriter, r *http.Request) {
    //I want to retrieve here "id" parameter from request
}

I would like to use just http package instead of web frameworks, if it is possible.

Thanks.

Answer 1

If you don't want to use any of the multitude of the available routing packages, then you need to parse the path yourself:

Route the /provisions path to your handler

http.HandleFunc("/provisions/", Provisions) 

Then split up the path as needed in the handler

id := strings.TrimPrefix(req.URL.Path, "/provisions/") // or use strings.Split, or use regexp, etc. 

Answer 2

You can use golang gorilla/mux package's router to do the path mappings and retrieve the path parameters from them.

import (     "fmt"     "github.com/gorilla/mux"     "net/http" )  func main() {     r := mux.NewRouter()     r.HandleFunc("/provisions/{id}", Provisions)     http.ListenAndServe(":8080", r) }  func Provisions(w http.ResponseWriter, r *http.Request) {     vars := mux.Vars(r)     id, ok := vars["id"]     if !ok {         fmt.Println("id is missing in parameters")     }     fmt.Println(`id := `, id)     //call http://localhost:8080/provisions/someId in your browser     //Output : id := someId } 

Answer 3

Golang read value from URL query "/template/get/123".

I used standard gin routing and handling request parameters from context parameters.

Use this in registering your endpoint:

func main() {
    r := gin.Default()
    g := r.Group("/api")
    {
        g.GET("/template/get/:Id", templates.TemplateGetIdHandler)
    }
    r.Run()
}

And use this function in handler

func TemplateGetIdHandler(c *gin.Context) {
    req := getParam(c, "Id")
    //your stuff
}

func getParam(c *gin.Context, paramName string) string {
    return c.Params.ByName(paramName)
}

Golang read value from URL query "/template/get?id=123".

Use this in registering your endpoint:

func main() {
    r := gin.Default()
    g := r.Group("/api")
    {
        g.GET("/template/get", templates.TemplateGetIdHandler)
    }
    r.Run()
}

And use this function in handler

type TemplateRequest struct {
    Id string `form:"id"`
}

func TemplateGetIdHandler(c *gin.Context) {
    var request TemplateRequest
    err := c.Bind(&request)
    if err != nil {
        log.Println(err.Error())
        c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
    }
    //your stuff
}