protected function prepareRequestHeaders(array $headers): array
    {
        $preparedHeaders = [];

        foreach ($headers as $key => $value) {
            if (\count((array) $value) === 1) {
                $preparedHeaders[$key] = $value[0];
            } else {
                $preparedHeaders[$key] = $value;
            }
        }

        return $preparedHeaders;
    }
protected function prepareRequestHeaders(array $headers): array
    {
        $preparedHeaders = [];

        foreach ($headers as $key => $value) {
            if (\count((array) $value) === 1) {
                $preparedHeaders[$key] = $value[0];
            } else {
                $preparedHeaders[$key] = $value;
            }
        }

        return $preparedHeaders;
    }
protected function prepareRequestHeaders ( array $ headers ) : array { $ preparedHeaders = [ ] ; foreach ( $ headers as $ key => $ value ) { if ( \ count ( ( array ) $ value ) === 1 ) { $ preparedHeaders [ $ key ] = $ value [ 0 ] ; } else { $ preparedHeaders [ $ key ] = $ value ; } } return $ preparedHeaders ; }
Prepare request headers.

@param array $headers

@return array
Prepare request headers .