如何从MongoDB获取数据并将其作为JSON发送到Golang中的API

import (
    "context"
    "log"
    "encoding/json"
    "net/http"
    
    "go.mongodb.org/mongo-driver/mongo"
    "go.mongodb.org/mongo-driver/mongo/options"
)

clientOptions := options.Client().ApplyURI("mongodb://localhost:27017")
client, err := mongo.Connect(context.Background(), clientOptions)
if err != nil {
    log.Fatal(err)
}
defer client.Disconnect(context.Background())

collection := client.Database("mydatabase").Collection("mycollection")
cur, err := collection.Find(context.Background(), bson.M{})
if err != nil {
    log.Fatal(err)
}
defer cur.Close(context.Background())

var results []bson.M
for cur.Next(context.Background()) {
    var result bson.M
    err := cur.Decode(&result)
    if err != nil {
        log.Fatal(err)
    }
    results = append(results, result)
}
if err := cur.Err(); err != nil {
    log.Fatal(err)
}

jsonData, err := json.Marshal(results)
if err != nil {
    log.Fatal(err)
}

func handler(w http.ResponseWriter, r *http.Request) {
    w.Header().Set("Content-Type", "application/json")
    w.Write(jsonData)
}

http.HandleFunc("/", handler)
log.Fatal(http.ListenAndServe(":8080", nil))