How to Create a Python HTTP Handler in IIS?

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To create a Python HTTP handler in IIS, you need to follow these steps:

  1. Install the “ISAPI Extension for Python” module on the IIS server. You can download it from the official Python website or using pip:
pip install pywin32
pip install isapi
  1. Create a Python script that implements your HTTP handler. This script should handle the HTTP request and return the response. Here’s an example:
from isapi import isapicon, threaded_extension
import os

class HelloWorldHandler(threaded_extension.ThreadPoolExtension):
    def Dispatch(self, ecb):
        ecb.SendResponseHeaders("200 OK", "Content-type: text/html\r\n\r\n")
        ecb.WriteClient("<html><body><h1>Hello, world!</h1></body></html>")

def __ExtensionFactory__():
    return HelloWorldHandler()

This script defines an HTTP handler that sends a simple “Hello, world!” message as the response.

  1. Save the script as a .py file in a directory on the IIS server.
  2. Create a new virtual directory in IIS that points to the directory where you saved the script.
  3. Configure the virtual directory to use the “Python FastCGI” handler. To do this, open the virtual directory properties, go to the “Handler Mappings” section, and click “Add Module Mapping”. Enter the following information:
  • Request path: *.py
  • Module: FastCgiModule
  • Executable: C:\Python39\python.exe (or the path to your Python installation)
  • Arguments: -u %s (this tells Python to run the script specified in the URL)
  • Name: Python FastCGI
  1. Save the module mapping and restart IIS.
  2. Test your handler by accessing the script URL in a web browser. For example, if your script is named “” and you saved it in a virtual directory named “test”, you can access it at http://localhost/test/

Note: This is a basic example of how to create a Python HTTP handler in IIS. Depending on your requirements, you may need to add more functionality to your script or configure IIS differently.

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