Python Requests without SNI Support over TLS: Troubleshooting Tips

  1. Introduction
  2. What is SNI?
  3. The Problem with Python Requests and SNI
  4. Troubleshooting Tips
    1. 1. Check the Server
    2. 2. Check the Proxy
    3. 3. Disable SNI in Requests
    4. 4. Upgrade to a Newer Version of Python
  5. Conclusion


Python Requests is a widely-used library for making HTTP requests in Python. However, if you are using Requests to make HTTPS connections without SNI support, you may encounter errors and have trouble troubleshooting the issue. In this article, we will provide some tips for troubleshooting this issue and help you get your Requests working smoothly again.

What is SNI?

SNI stands for Server Name Indication, and it is an extension to the TLS protocol that allows multiple SSL/TLS certificates to be served from the same IP address. Without SNI, only one SSL/TLS certificate can be served from each IP address, which can be a problem in situations where multiple domains need to be served from the same IP address.

The Problem with Python Requests and SNI

Python Requests uses the urllib3 library for making HTTPS connections, and urllib3 has built-in support for SNI. However, there are situations where SNI support may not be available, such as when connecting to older servers or when using certain proxies. In these cases, Requests may encounter errors when attempting to make HTTPS connections.

Troubleshooting Tips

If you are encountering issues with Python Requests and SNI, here are some troubleshooting tips to help you diagnose and resolve the issue:

1. Check the Server

The first step in troubleshooting is to check the server you are connecting to. Does it support SNI? If not, you may need to upgrade the server or find an alternative solution.

2. Check the Proxy

If you are using a proxy, check to see if it supports SNI. If not, you may need to find a different proxy or bypass the proxy altogether.

3. Disable SNI in Requests

If you are unable to upgrade the server or find a compatible proxy, you can disable SNI in Requests by setting the verify parameter to False:

import requests

response = requests.get('', verify=False)

Note that disabling SNI may have security implications, so use this option with caution.

4. Upgrade to a Newer Version of Python

If you are using an older version of Python, upgrading to a newer version may resolve the issue. Newer versions of Python have better support for SNI and may be more compatible with the servers you are connecting to.


Python Requests is a powerful library for making HTTP requests, but it can encounter issues when making HTTPS connections without SNI support. By following these troubleshooting tips, you can diagnose and resolve issues with SNI and get your Requests working smoothly once again.

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