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

Hello Guys, How are you all? Hope You all Are Fine. Today I am just trying to run simple flask code and I am facing following error WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead in python. So Here I am Explain to you all the possible solutions here.

Without wasting your time, Let’s start This Article to Solve This Error.

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

I am just trying to run simple flask code and I am facing following error.

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

* Restarting with stat
* Debugger is active!
* Debugger PIN: 123-456-789
* Running on http://127.0.0.1:5000/

How To Solve WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead Error ?

  1. How To Solve WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead Error ?

    To Solve WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead Error This application is running in development mode and you're using it in production Thats why you are facing this error Here you should use Waitress a production WSGI server. If you are deploying your application to production then you have to use waitress. Follow this simple example.

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

    To Solve WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead Error This application is running in development mode and you're using it in production Thats why you are facing this error Here you should use Waitress a production WSGI server. If you are deploying your application to production then you have to use waitress. Follow this simple example.

Solution 1: use Waitress

Here you should use Waitress a production WSGI server. If you are deploying your application to production then you have to use waitress. Follow this simple example.

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)

And then run your application with this command.

python hello.py

Solution 2: Enable development mode by setting the FLASK_ENV environment

This application is running in development mode and you’re using it in production Thats why you are facing this error. Just Enable development mode by setting the FLASK_ENV environment variable to development.

export FLASK_APP=example
export FLASK_ENV=development
flask run

Summary

It’s all About this issue. Hope all solution helped you a lot. Comment below Your thoughts and your queries. Also, Comment below which solution worked for you?

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