Solve tip “WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead”

March 1, 2022

Error Messages

Many people suddenly get the “WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead” message when they are just running some uncomplicated flask code.

Please refer to the fastest solutions right below if you encounter this situation! 

WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead

How Did The “WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead” Command Happen? 

As we all know, warning commands happen in almost all our coding activities. If you want to solve the trouble, you need to be aware of its display.

The way to recognize this type of warning is when you are running the uncomplicated flask code and notice the caution be displayed with the content: 

WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead

* Restarting with stats

* The debugger is active!

* Debugger PIN: 123-456-789

* Operating at http://127.0.0.1:5000

How To Deal With This Command?

The content displayed is also the scope of the problem you are having, so the most important thing is carefully reading what the command line is warning about.

When you look at the command line “WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead,” you can also easily know that they are warning you about the problems you are currently facing. 

Specifically, this type of application is currently being used in production and running in development mode so that you will encounter this message. If you get this message, use a production WSGI server as Waitress.

The Waitress is recommended because it is suitable and capable of deploying applications to production. To get the most specific view, please instantly refer to the following examples: 

Solution 1 – Choose To Use “Waitress”.

For this, you should use “Waitress” if you deploy and roll your application into production. Most of the first solutions to fix this warning are choosing “Waitress,” a production WSGI server. You can follow the example illustrated right below: 

from flask import Flask

app = Flask(__name__)

@app.route("/")
def index():
    return "<h1>Hello World!</h1>"

if __name__ == "__main__":
    from waitress import serve
    serve(app, host="0.0.0.0", port=8080)

After showing the above command line, use this command to continue running.

python hello.py

Solution 2 – Using Enabling Development Mode Via The “FLASK_ENV” Environment Method.

You are reaching this issue because the app is running in production and development mode. In this second solution, you need to enable growth mode by specifying the “FLASK_ENV” environment. Refer to the following command line:

export FLASK_APP=example

export FLASK_ENV=development

flask run 

Conclusion

This problem is quite simple, but not everyone can easily understand it. If you notice, “WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead” Try the solutions we suggested above for the fastest fix!

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