The following applies to any global Python data that you don’t want to recreate for each request, not just rserve, and not just data that is unique to each user. We need some common location to create an rserve connection for each user. The simplest way to do this is to run a multiprocessing.Manager as … Read more
You have by default the static endpoint for static files. Also Flask application has the following arguments: static_url_path: can be used to specify a different path for the static files on the web. Defaults to the name of the static_folder folder. static_folder: the folder with static files that should be served at static_url_path. Defaults to … Read more
First of all, the .json attribute is a property that delegates to the request.get_json() method, which documents why you see None here. You need to set the request content type to application/json for the .json property and .get_json() method (with no arguments) to work as either will produce None otherwise. See the Flask Request documentation: … Read more
The form tag needs some attributes set: action: The URL that the form data is sent to on submit. Generate it with url_for. It can be omitted if the same URL handles showing the form and processing the data. method=”post”: Submits the data as form data with the POST method. If not given, or explicitly … Read more
When you “run Flask” you are actually running Werkzeug’s development WSGI server, and passing your Flask app as the WSGI callable. The development server is not intended for use in production. It is not designed to be particularly efficient, stable, or secure. It does not support all the possible features of a HTTP server. Replace … Read more
While this is possible, you should not use the Flask dev server in production. The Flask dev server is not designed to be particularly secure, stable, or efficient. See the docs on deploying for correct solutions. The –host option to flask run, or the host parameter to app.run(), controls what address the development server listens … Read more
As of Flask 1.1.0 a view can directly return a Python dict and Flask will call jsonify automatically. @app.route(“/summary”) def summary(): d = make_summary() return d If your Flask version is less than 1.1.0 or to return a different JSON-serializable object, import and use jsonify. from flask import jsonify @app.route(“/summary”) def summary(): d = make_summary() … Read more
You can’t use global variables to hold this sort of data. Not only is it not thread safe, it’s not process safe, and WSGI servers in production spawn multiple processes. Not only would your counts be wrong if you were using threads to handle requests, they would also vary depending on which process handled the … Read more
In production, configure the HTTP server (Nginx, Apache, etc.) in front of your application to serve requests to /static from the static folder. A dedicated web server is very good at serving static files efficiently, although you probably won’t notice a difference compared to Flask at low volumes. Flask automatically creates a /static/<path:filename> route that … Read more
The docs describe the attributes available on the request object (from flask import request) during a request. In most common cases request.data will be empty because it’s used as a fallback: request.data Contains the incoming request data as string in case it came with a mimetype Flask does not handle. request.args: the key/value pairs in … Read more