PHP CURL suddenly stop working on https request - php

Question

Until literally a couple of days ago, everything was going well, but now, Curl has stopped working for addresses with HTTPS.
This is the code:
$url = 'https://android.googleapis.com/gcm/send';
$fields = array(
'registration_ids' => array($registation_ids),
'data' => array( "message" => $message,
"title" => $title,
"params" => $params,
"code" =>$code),
);
$headers = array(
'Authorization: key=' . GOOGLE_API_KEY,
'Content-Type: application/json'
);
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($fields));
$result = curl_exec($ch);
This code had been running smoothly for over a year. But now it returns this:
Proxy Error
The proxy server received an invalid response from an upstream server.
The proxy server could not handle the request GET
/app/test_notifications.
Reason: Error reading from remote server
Apache/2.2.15 (Red Hat) Server at app-servername.rhcloud.com Port 80
However, if in the previous code I remove the s from https:// ... like this http://android.googleapis.com/gcm/send the request is sent without problems, but I can not allow that modification, since I also need access to other addresses that require SSL.
I have also tested with other https addresses, but it is the same result
Searching on the internet I found the solution to update curl, but I'm not sure if that is my solution, since the code executed correctly https requests last week. Anyway I leave here the curl --version response on my server:
curl 7.19.7 (x86_64-redhat-linux-gnu) libcurl/7.19.7 NSS/3.27.1 zlib/1.2.3 libidn/1.18 libssh2/1.4.2
Protocols: tftp ftp telnet dict ldap ldaps http file https ftps scp sftp
Features: GSS-Negotiate IDN IPv6 Largefile NTLM SSL libz
Is there a way to test that, in effect, is a Curl problem? That would help me to know how to find the solution.

Answer 1

I think it's a Google upgrade not a Curl problem.
Firebase Cloud Messaging (FCM) is the new version of GCM. It inherits the reliable and scalable GCM infrastructure, plus new features! See the FAQ to learn more. If you are integrating messaging in a new app, start with FCM. GCM users are strongly recommended to upgrade to FCM, in order to benefit from new FCM features today and in the future.
GCM Connection Server Reference
HTTP Protocol
XMPP Protocol
Android API Reference
iOS API Reference
Chrome API Reference
Contents
Downstream message syntax
Downstream HTTP messages (JSON)
Notification payload support
Downstream HTTP messages (Plain Text)
Interpreting a downstream message response
Downstream message error response codes
Check https://developers.google.com/cloud-messaging/http-server-ref

Answer 2

Reviewing the problem and comparing my different applications in Openshift I realized that curl in https addresses worked in one of them. I checked the differences using phpinfo() and discovered that, contrary to what the server indicated, in the application that presented the problem, SSL Version was 3.18.1 and not 3.27.1.
Solution: restart the application in openshift and if that does not work, manually update curl. (Restart work for me)