old_contents: import requests
  from flask import Flask, render_template
  
  app = Flask(__name__, instance_relative_config=True)
  app.config.from_pyfile("appconfig.py")
  
  BBC_id= "bbc-news"
  
  @app.route("/")
  def index():
      r = requests.get(
          f"https://newsapi.org/v1/articles?source={BBC_id}&sortBy=top&apiKey={app.config['API_KEY']}"
      )
      return render_template("index.html", articles=r.json().get("articles"))
  
  
  if __name__ == "__main__":
      app.run()
new_contents: import requests
  from flask import Flask, render_template
  
  app = Flask(__name__, instance_relative_config=True)
  app.config.from_pyfile("appconfig.py")
  
  sources = {
      "bbc": "bbc-news",
      "cnn": "cnn",
      "hackernews": "hacker-news"
  }
  
  def create_link(source):
      if source in sources.keys():
          return f"https://newsapi.org/v1/articles?source={sources[source]}&sortBy=top&apiKey={app.config['API_KEY']}"
      
  
  @app.route("/")
  @app.route("/<source>")
  def index(source="bbc"):
      r = requests.get(create_link(source))
      return render_template("index.html", articles=r.json().get("articles"), source=source)
  
  
  if __name__ == "__main__":
      app.run()
subject: Create dynamic routing for supported sources.