In this tutorial, we'll build a Flask application that checks whether the incoming requests are from proxy servers using the IPQuery API. We’ll also render a simple HTML page to display the results of the proxy check dynamically.

Requirements:

Python 3.x Flask requests library to interact with the IPQuery API

\ You can install the required libraries using pip:

pip install flask requests Step 1: Setting Up the Flask Backend

First, let’s set up a basic Flask application. We’ll create an endpoint that receives the visitor's IP address and uses the IPQuery API to check if the IP is associated with any proxy services.

\ We will render the results on an HTML page using Jinja2's {{ }} syntax to inject data dynamically.

app.py

from flask import Flask, render_template, request import requests app = Flask(__name__) # Helper function to query IP info from IPQuery API def check_ip(ip): api_url = f"https://api.ipquery.io/{ip}" response = requests.get(api_url) return response.json() # Route to handle the proxy check @app.route('/') def index(): visitor_ip = request.remote_addr # Get the IP address of the visitor ip_data = check_ip(visitor_ip) # Fetch IP details from IPQuery is_proxy = ip_data['risk']['is_proxy'] # Check if the IP is a proxy # Render HTML with the result return render_template('index.html', ip=visitor_ip, ip_data=ip_data, is_proxy=is_proxy) if __name__ == '__main__': app.run(debug=True)

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Step 2: HTML Template with Jinja2

Now, let’s create an HTML template that will display the visitor’s IP and whether or not it is a proxy. We’ll use Flask’s built-in template engine Jinja2 to dynamically inject data.

\ templates/index.html

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Step 3: Testing the Application

Once the Flask application and the HTML template are set up, you can run the application by executing:

python app.py

\ Open your browser and navigate to http://127.0.0.1:5000/. The page will show the visitor’s IP address, location details, and whether or not the IP is associated with a proxy.

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