Scraping SSL CERTIFICATE_VERIFY_FAILED error for http//en.wikipedia.org
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When attempting to scrape content from websites such as http://en.wikipedia.org using Python's `urllib`, `requests`, or other HTTP libraries, users may encounter an error labeled as `SSL: CERTIFICATE_VERIFY_FAILED`. This error is particularly common when the target server requires the use of SSL/TLS for secure communication, and something isn't perfectly right with the configuration or validation of the certificate on the client side. Below, we'll delve into why this error occurs and the steps to resolve it, drawing on practical examples and clarifications.
Understanding SSL/TLS Certificates
SSL (Secure Sockets Layer) and its successor, TLS (Transport Layer Security), are cryptographic protocols designed to provide secure communication over a computer network. Websites with HTTPS make use of these protocols to encrypt data before it is sent over the internet, ensuring privacy and integrity.
A website's SSL/TLS certificate is issued by a trusted Certificate Authority (CA). This certificate verifies the identity of the website and enables encrypted communication. When a client (like a web browser or a script) attempts to connect to the server over HTTPS, it must first verify the server's certificate to ensure the connection is secure.
Common Causes of `CERTIFICATE_VERIFY_FAILED`
The `CERTIFICATE_VERIFY_FAILED` error occurs when a client's verification of the server's certificate fails. Here are some common causes:
- Expired Certificates: The server's certificate may have expired and become invalid.
- Untrusted Certificate Authority: The certificate may be issued by a CA that is not recognized by the client.
- Self-signed Certificates: The server is using a certificate it signed itself.
- Incorrect System Clock: The client’s system clock might be incorrect, causing issues with verifying the certificate's validity period.
- Absent or Outdated Root Certificates: The client might not have the CA's root certificate or, if it does, it might be outdated.
Troubleshooting Steps
1. Verify the System Date and Time
Ensure that the system's date and time settings are accurate. An incorrect system clock can lead to the failure of certificate expiry checks.
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