Google Client PHP API ERR_EMPTY_RESPONSE Error

Question

I am having a very difficult time trying to track down an error when calling Googles $client->refreshToken().

The server is returning a ERR_EMPTY_RESPONSE 324 run time error, but I cant seem to catch the error.

Here is my code:

$ref = $this->client->getRefreshToken();
try {
    $this->client->refreshToken($ref); // <<<<<<<<<<<<ERROR HERE
} catch (\Exception $e) {
     if($debug){
        print_r( $e ); 
        print_r( $this ); 
     }
    return false;
}

Answer 1

The problem was a recently published an update to the NSS package for CentOS 7 systems which was resulting in an Aache error

/usr/sbin/httpd: symbol lookup error: /lib64/libnsssysinit.so: undefined symbol: PR_GetEnvSecure

The issue was resolved by restarting the Apache and FPM services.