[Backport 2.1] 8373: Fix CURL Json POST #14151
Merged
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This is a backport of 8373 (MAGETWO-64313) for Magento 2.1 that fixed issue #3489
Description
Using \Magento\Framework\HTTP\Client\Curl doesn't support json posts, because it used only
$this->curlOption(CURLOPT_POSTFIELDS, http_build_query($params));
Manual testing scenarios
As explained in #8373
That functionality doesn't break backward compatibility will be very useful for most projects.