Lines 4, 8, 14: For the sake of readability, I’ve placed my HelloApiHandler.py in a sub-directory called api. Includes detailed security, auto CRUD generation for your models, google charts and much more. It includes detailed security, auto CRUD generation for. Flask App Builder is a simple and rapid application development framework, built on top of Flask. For more information on CORS errors, check out this or this link. Flask-AppBuilder Flask AppBuilder Flask-AppBuilder ¶ Simple and rapid application development framework, built on top of Flask. While previously a simple app.run() call inside the application script was used, now there is a flask run command, plus a FLASKAPP environment variable. But this is about to change with this Flask RAD framework: Flask App Builder, that speed up your project production by offering dozens of ready tools and features for building enterprise apps. ![]() Hence, when React is making a request to Flask backend, this CORS error pops up. At this current stage (before deployment), React is running on port 3000 and Flask on port 5000. Answer 5: you should use FLASKENVdevelopment (not FLASKDEBUG1 ) as a safety check, you can run flask run -debugger just to make sure its turned on the. Lines 3, 7: This is meant to get rid of the annoying CORS error we always get when we’re making an API request to a different domain. Lastly, send_from_directory allows us to send our “index.html” file from our “frontend/build” directory. ![]() Lines 10–12: the decorator tells Flask which URL should trigger our serve(path) function. has a new command line manager, integrated with Flask cli. The static_folder points to the build directory of our react project (because I named my sub-directory frontend, it’s frontend/build in my case - change this accordingly). The static_url_path can be used to specify a different path for the static files on the web and it defaults to the name of the static_folder folder. With reference to the official Flask documentation, you’ll notice that in my example there are two more arguments (static_url_path and static_folder). In line 6, we created an instance of the Flask class.
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