Your operating system has ways to generate pretty random data based on a cryptographic random generator. Use the following command to quickly generate a value for Flask.secret_key (or SECRET_KEY): $ that generates a lot of CSV data on the fly. The trick is to have an inner function that uses a generator to generate data and to then invoke that function and pass it to a response object: from flask provides you with a helper that can keep the request context around during the execution of the generator: from flask import stream_with_context, request, Response @app.route('/stream') def streamed_response():

Your operating system has ways to generate pretty random data based on a cryptographic random generator. Use the following command to quickly generate a value for Flask.secret_key (or SECRET_KEY): $ that generates a lot of CSV data on the fly. The trick is to have an inner function that uses a generator to generate data and to then invoke that function and pass it to a response object: from flask provides you with a helper that can keep the request context around during the execution of the generator: from flask import stream_with_context, request, Response @app.route('/stream') def streamed_response():