http_ssl_fix

<?php
/**
 * Plugin Name: Fix SSL Versions & Cloudflare ECDSA
 * Description: Remove SSL v1-3 from cURL Requests. PHP v5.5.19+/5.6.3+ only
 * Author:      Ondra Kosik <ondra@kosik.co.uk>
 * Author URl:  http://kosik.co.uk
 * License:     MIT
 */

add_action( 'http_api_curl', function( $args )
{
    curl_setopt(
        $args[0],
        CURLOPT_SSLVERSION,
        CURL_SSLVERSION_TLSv1_2
        | CURL_SSLVERSION_TLSv1_1
        | CURL_SSLVERSION_TLSv1_0
    );
    curl_setopt($args[O], CURLOPT_SSL_CIPHER_LIST, 'ecdhe_ecdsa_aes_128_sha');
} );