Home >Backend Development >PHP Tutorial >Why Is My cURL Returning Zero-Length Content When Connecting to an HTTPS Site?
Troubleshooting HTTPS Connection Issues with cURL
You've encountered an issue where cURL is returning zero-length content when attempting to connect to a secure HTTPS site. Let's explore some potential solutions:
The problem may lie with the certificate verification process. cURL uses a bundled certificate file to validate remote HTTPS connections. However, this bundled file can become outdated, leading to authentication issues.
Solution:
curl_setopt ($curl_ch, CURLOPT_CAINFO, dirname(__FILE__)."/cacert.pem");
Alternative Solution:
curl.cainfo=/etc/ssl/certs/ca-certificates.crt
This will instruct PHP to use the system's certificate authority file.
Composer Package Solution:
For a more robust solution, consider using the certainty composer package: https://github.com/paragonie/certainty. It automates the certificate management process, ensuring your code is not vulnerable to certificate revocation or other issues.
It's essential to remember that disabling CURLOPT_VERIFYPEER and CURLOPT_VERIFYHOST leaves your code susceptible to man-in-the-middle attacks. Always verify HTTPS connections properly to maintain the integrity of your communication.
The above is the detailed content of Why Is My cURL Returning Zero-Length Content When Connecting to an HTTPS Site?. For more information, please follow other related articles on the PHP Chinese website!