src/Message.php
private function removeHeader($name)
	{
		if ($this->hasHeader($name)) {
			$normalized = strtolower($name);

			unset($this->headers[$this->headerNames[$normalized]], $this->headerNames[$normalized]);
		}

		return $this;
	}
private function removeHeader($name)
	{
		if ($this->hasHeader($name)) {
			$normalized = strtolower($name);

			unset($this->headers[$this->headerNames[$normalized]], $this->headerNames[$normalized]);
		}

		return $this;
	}
Remove the header.

@param string $name
@return $this