old_contents: from flask import Flask
  
  from .extensions import envcfg, apierrors, applogging
  from .blueprints.status import blueprint as status_bp
  from .blueprints.content import blueprint as content_bp
  from .blueprints.swagger import blueprint as swagger_bp
  
  
  def create_app():
      app = Flask('content')
      app.config.from_object('content.default_settings')
      envcfg.init_app(app)
      applogging.init_app(app)
      apierrors.init_app(app)
      app.register_blueprint(status_bp)
      app.register_blueprint(content_bp, url_prefix='/v1')
      app.register_blueprint(swagger_bp)
      return app
  
new_contents: from flask import Flask, jsonify
  
  from botocore.exceptions import ClientError
  
  from .extensions import envcfg, apierrors, applogging
  from .blueprints.status import blueprint as status_bp
  from .blueprints.content import blueprint as content_bp
  from .blueprints.swagger import blueprint as swagger_bp
  
  
  def create_app():
      app = Flask('content')
      app.config.from_object('content.default_settings')
      envcfg.init_app(app)
      applogging.init_app(app)
      apierrors.init_app(app)
      app.register_blueprint(status_bp)
      app.register_blueprint(content_bp, url_prefix='/v1')
      app.register_blueprint(swagger_bp)
      app.register_error_handler(ClientError, _no_such_key)
      return app
  
  
  def _no_such_key(error):
      # Boto3 exceptions are idiotic.
      if error.response['Error']['Code'] != "NoSuchEntity":
          return jsonify({'error': 'No such content'}), 404
      else:
          raise error
  
subject: Return 404 when no content found.