Amp\Artax\Client::normalizeRequestHostHeader PHP Method

    private function normalizeRequestHostHeader(Request $request, Uri $uri)
    {
        if ($request->hasHeader('Host')) {
            return;
        }
        $authority = $this->generateAuthorityFromUri($uri);
        $host = $this->removePortFromHost($authority);
        $request->setHeader('Host', $host);
    }