If curl cannot connect, use exec directly and don't use the curl sandboxing [#3085327] | Drupal.org
Failed to get available update data for one project. | AMBIDEV
Improve module description and error message about missing Curl library [#2474017] | Drupal.org
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Testing Resources with cURL | Drupalize.Me
Getting update info results in RequestException : cURL error 60: SSL certificate problem: unable to get local issuer certificate [#2654474] | Drupal.org