Go, formatting if/else statements correctly. Golang style, advanced ideas? JSON errors

I have been programming Go for 3 days now, I am a complete beginner when it comes to this. But I really like the language, and seems a lot easier than C to learn. I love the neatness and everything about it.

My question is, I am building a API to upload files to a database, and also a endpoint which you see below that searches the database.

I am wondering if this is the correct way in Go to serve a JSON response code for a error. Or is there a more advanced way to set up my if else statements if a error occurs. I am trying to build this the correct way. But this is my code, 100%. So I am open for ideas thanks.

I am wondering if there is a way to do what I am doing more efficiently.

package main

import (
    "net/http"
    "log"
    "http://ift.tt/J9WoXt"
    "gopkg.in/mgo.v2"
    "gopkg.in/mgo.v2/bson"
    "encoding/json"
)

type Result struct {
    ID  string
    URL string
}


func main() {
    router := mux.NewRouter()

    router.HandleFunc("/view", View).Methods("GET")
    log.Fatal(http.ListenAndServe(":4000", router))
}

func View(w http.ResponseWriter, r *http.Request) {
    id := r.FormValue("id")
    if len(id) > 1 {
        session, err := mgo.Dial("mongodb://")
        if err != nil {
            // Server Error
            status := map[string]int{"Error": 500}
            js, _ := json.Marshal(status)

            w.WriteHeader(500)
            w.Header().Set("Content-Type", "application/json")
            w.Write(js)
            return
        } else {
            defer session.Close()

            session.SetMode(mgo.Monotonic, true)
            collection := session.DB("api").C("uploads")
            item := Result{}
            err = collection.Find(bson.M{"id": id}).One(&item)
            if err != nil {
                // Database Empty
                status := map[string]int{"Error": 204}
                js, _ := json.Marshal(status)

                w.WriteHeader(204)
                w.Header().Set("Content-Type", "application/json")
                w.Write(js)
                return
            } else {
                js, err := json.Marshal(&item)
                if err != nil {
                    // Server Error
                    status := map[string]int{"Error": 500}
                    js, _ := json.Marshal(status)

                    w.WriteHeader(500)
                    w.Header().Set("Content-Type", "application/json")
                    w.Write(js)
                    return
                } else {
                    // Success
                    w.WriteHeader(200)
                    w.Header().Set("Content-Type", "application/json")
                    w.Write(js)
                }
            }
        }
    } else {
        // Bad Request
        status := map[string]int{"Error": 400}
        js, _ := json.Marshal(status)

        w.WriteHeader(400)
        w.Header().Set("Content-Type", "application/json")
        w.Write(js)
        return
    }

}