Python Microservices Development

Request

When a request comes in, Flask calls the view inside a thread-safe block, and uses Werzeug's local helper (http://werkzeug.pocoo.org/docs/latest/local/). This helper does a job similar to Python's threading.local (https://docs.python.org/3/library/threading.html#thread-local-data), and makes sure that each thread has an isolated environment, specific to that request.

In other words, when you access the global request object in your view, you are guaranteed that it's unique to your thread, and will not leak data to another thread in a multi-threaded environment.

As we've seen earlier, Flask uses the incoming WSGI environment data to create the request object. That object is a Request class instance, which merges several mixin classes ...