Description:
------------
CURLOPT_RETURNTRANSFER is set to 1 for all processes.
String response is properly returned.
Target http site changed to new target https site.
String response is properly returned.

Target is changed back to http site.
Boolean true (1) is returned for each invocation to the http site.

Target is changed back to https site.
String response is properly returned.

Reproduce code:
---------------
if (GATEWAY_MODE_PROD) {
        $gatewayProvider = "https://...";
} else {
        $gatewayProvider = "http://...";
}
$urlPostFields = "postStringCreatedEarlier";        
$curlReq = curl_init($gatewayProvider);
curl_setopt($curlReq, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($curlReq, CURLOPT_REFERER, GATEWAY_REFERER);
curl_setopt($curlReq, CURLOPT_POST, 1);
curl_setopt($curlReq, CURLOPT_HEADER, 0);
curl_setopt($curlReq, CURLOPT_FOLLOWLOCATION, 0);
curl_setopt($curlReq, CURLOPT_FAILONERROR, 1);
curl_setopt($curlReq, CURLOPT_TIMEOUT, CONNECTION_TIMEOUT);
curl_setopt($curlReq, CURLOPT_POSTFIELDS, $urlPostFields);

$curlResp = curl_exec($curlReq);

Expected result:
----------------
The expected result is to always see the string response.

Actual result:
--------------
When starting at !GATEWAY_MODE_PROD and switching to GATEWAY_MODE_PROD, expected response is returned.

Switching again back to !GATEWAY_MODE_PROD causes the boolean response to be returned rather than the string response.

Switching again back to GATEWAY_MODE_PROD returns the expected string result.