[Python] Flask Subdomain Routing Not Working Correctly After Deployment on Render.com

I'm stuck with an issue on how to properly set up subdomains in my Flask project. Here's a simple example of the code I'm working with:

from flask import Flask

app = Flask(__name__)
app.config['SERVER_NAME'] = 'buytogo.space'

@app.route('/')
def main_index():
return "You are visiting the main domain"

@app.route('/', subdomain='toothpaste')
def product_landing_1():
return "Welcome to the TOOTHPASTE subdomain"

@app.route('/', subdomain='cooler')
def product_landing_2():
return "Welcome to the COOLER subdomain"

@app.route('/', subdomain='<subdomain>')
def wildcard_subdomain(subdomain):
return f"You are visiting the subdomain: {subdomain}"

if __name__ == '__main__':
app.run()


I successfully deployed this project on Render.com, and there are no errors. I purchased a domain name, added it to the project on Render, and verified it (You can see the website live at https://buytogo.space/ and https://toothpaste.buytogo.space/).

And my project is running on https://domain-testing-server-for-landing.onrender.com.

To set up subdomains with the provider, I added the following DNS record:

• Type: CNAME
• Name: toothpaste
• Value: domain-testing-server-for-landing.onrender.com

(Note: I didn't add the cooler domain to test how it will behave.)

Now, I am encountering an issue:

As you can see, the same server responses appear on both https://buytogo.space/ and https://toothpaste.buytogo.space/, but based on the code, the responses should be different depending on the subdomain.

I would appreciate any help to resolve this issue.

Thank you!

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