In Flask, a view must return one of the following: a string a Response object (or subclass) a tuple of (string, status, headers) or (string, status) a valid WSGI application Flask tests for the first 3 options, and if they don’t fit, assumes it is the fourth. You returned True somewhere, and it is being … Read more
The following does not return a response: @app.route(‘/hello’, methods=[‘GET’, ‘POST’]) def hello(): hello_world() You mean to say… @app.route(‘/hello’, methods=[‘GET’, ‘POST’]) def hello(): return hello_world() Note the addition of return in this fixed function.
Flask’s Jinja environment automatically escapes data rendered in HTML templates. This is to avoid security issues if the dev tries to render untrusted user input. Since you are passing a Python object to be treated as JSON, Flask provides the tojson filter which automatically dumps the data to JSON and marks it safe. return render_template(‘tree.html’, … Read more
You must create your template files in the correct location; in the templates subdirectory next to the python module (== the module where you create your Flask app). The error indicates that there is no home.html file in the templates/ directory. Make sure you created that directory in the same directory as your python module, … Read more
To turn off autoescaping when rendering a value, use the |safe filter. {{ something|safe }} Only do this on data you trust, since rendering untrusted data without escaping is a cross-site scripting vulnerability.
The problem is you are only binding to the localhost interface, you should be binding to 0.0.0.0 if you want the container to be accessible from outside. If you change: if __name__ == ‘__main__’: app.run() to if __name__ == ‘__main__’: app.run(host=”0.0.0.0″) It should work. Note that this will bind to all interfaces on the host, … Read more
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