private function getHeaderBlacklist()
    {
        return [
            'cache-control'         => true,
            'content-type'          => true,
            'content-length'        => true,
            'expect'                => true,
            'max-forwards'          => true,
            'pragma'                => true,
            'range'                 => true,
            'te'                    => true,
            'if-match'              => true,
            'if-none-match'         => true,
            'if-modified-since'     => true,
            'if-unmodified-since'   => true,
            'if-range'              => true,
            'accept'                => true,
            'authorization'         => true,
            'proxy-authorization'   => true,
            'from'                  => true,
            'referer'               => true,
            'user-agent'            => true,
            'x-amzn-trace-id'       => true,
            'aws-sdk-invocation-id' => true,
            'aws-sdk-retry'         => true,
        ];
    }