protected function getHeaderName(string $name): string
	{
		$lower_name = strtolower($name);

		return $this->headerMap[$lower_name] ?? $name;
	}
protected function getHeaderName(string $name): string
	{
		$lower_name = strtolower($name);

		return $this->headerMap[$lower_name] ?? $name;
	}
protected function getHeaderName ( string $ name ) : string { $ lower_name = strtolower ( $ name ) ; return $ this -> headerMap [ $ lower_name ] ?? $ name ; }
Takes a header name in any case, and returns the
normal-case version of the header.

@param string $name

@return string
Takes a header name in any case and returns the normal - case version of the header .