PHP cURL issues only on some requests

Question

Good day..

I have a web app that makes requests to another server through proxies. Now i would say 99% of these requests works completely fine hand i have no issue what so ever and receive the response back.

However some requests ( again a very few amount ) will return HTTP response code 0, which means curl failed. After debug with curl_error i have collected these 2 errors.

OpenSSL SSL_connect: SSL_ERROR_SYSCALL in connection to URL.
Operation timed out after 7000 milliseconds with 0 out of 0 bytes received

Now the second one is self explanatory. Surely the SSL error is just due to a dodgy proxy otherwise i would get this response with every request and not just 1% ( to the same urls ) ? im pretty sure my curl config is ok. ( below ).

curl_setopt_array($this->ch, array( CURLOPT_RETURNTRANSFER => 1, CURLOPT_URL => $url, CURLOPT_FOLLOWLOCATION => 1, CURLOPT_AUTOREFERER => 1, CURLOPT_HTTPHEADER => $headers, CURLOPT_POST => 0, CURLOPT_ENCODING => 'gzip', CURLOPT_HEADER => 0 ));

Should i just add a curl exec retry if response is nothing / code = 0 ?

Thank you.

See if stackoverflow.com/questions/9774349/… helps wil SSL — Nigel Ren
– Nigel Ren, Commented Oct 27, 2018 at 11:09
Yes thank you that helps i think CURLOPT_SSL_VERIFYPEER will work just fine. Regards. — MHCH
– MHCH, Commented Oct 27, 2018 at 11:13

hanshenrik · Accepted Answer · 2018-10-27 14:03:02Z

yeah, just retry once or twice, and know that you're not alone, i wrote this some time back:

echo 'file: ' . $file . ' url: ' . $raw_url . '..' . PHP_EOL; try { $headers = implode ( " ", $hc->exec ( $url )->getResponseHeaders () ); } catch ( Exception $ex ) { try { $headers = implode ( " ", $hc->exec ( $url )->getResponseHeaders () ); } catch ( Exception $ex ) { // sometimes connection fails for no good reason, and a retry (or 2) fixes it... // here we give up and deliberately not catch the 3rd exception (if any) $headers = implode ( " ", $hc->exec ( $url )->getResponseHeaders () ); } }

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