什么将字符串".json“添加到url？

let url = "https://api.example.com/resource";
let jsonUrl = url + ".json";
console.log(jsonUrl);  // 输出: https://api.example.com/resource.json

url = "https://api.example.com/resource"
json_url = url + ".json"
print(json_url)  # 输出: https://api.example.com/resource.json

# 或者使用格式化字符串
json_url = f"{url}.json"
print(json_url)  # 输出: https://api.example.com/resource.json

class MyController < ApplicationController
  def show
    @resource = Resource.find(params[:id])
    respond_to do |format|
      format.html
      format.json { render json: @resource }
    end
  end
end

let url = "/resources/1.json";
fetch(url)
  .then(response => response.json())
  .then(data => console.log(data));

from django.http import JsonResponse
from .models import Resource

def resource_detail(request, id):
    resource = Resource.objects.get(id=id)
    return JsonResponse({'id': resource.id, 'name': resource.name})

let url = "/resources/1.json";
fetch(url)
  .then(response => response.json())
  .then(data => console.log(data));

from flask import Flask, jsonify
app = Flask(__name__)

@app.route('/resource/<int:id>.json')
def resource_detail(id):
    resource = {'id': id, 'name': 'Example Resource'}
    return jsonify(resource)

if __name__ == '__main__':
    app.run(debug=True)

let url = "/resource/1.json";
fetch(url)
  .then(response => response.json())
  .then(data => console.log(data));