I am trying to refresh the access token using API with PHP CURL before it was working fine, but now it is throwing this error message: HTTP/2 stream 1 was not closed cleanly: PROTOCOL_ERROR (err 1) This is the code: $ch = curl_init(); $base = 'https://authz.constantcontact.com/oauth2/default/v1/token'; $url = $base . '?refresh_token=' . $refreshToken . '&grant_type=refresh_token'; curl_setopt($ch, CURLOPT_URL, $url); $auth = $clientId . ':' . $clientSecret; $credentials = base64_encode($auth); $authorization = 'Authorization: Basic ' . $credentials; curl_setopt($ch, CURLOPT_HTTPHEADER, array($authorization, 'Content-Type: application/x-www-form-urlencoded')); curl_setopt($ch, CURLOPT_POST, true); curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); $result = curl_exec($ch); curl_close($ch); return $result; Please guide how to fix this.
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