diff --git a/common/HttpClient.php b/common/HttpClient.php
index 6ba2eea..15043fc 100644
--- a/common/HttpClient.php
+++ b/common/HttpClient.php
@@ -125,7 +125,11 @@ class HttpClient
 	 */
 	public function setHost(string $host)
 	{
-		$this->host = $host;
+		$this->host = $this->replaceHost($host);
+		$match_quest = '/^[a-zA-Z\-](\.[a-zA-Z\-])*/';
+		if (preg_match($match_quest, $this->host)) {
+			$this->addHeader('Host', $this->host);
+		}
 	}
 
 	/**
@@ -262,7 +266,6 @@ class HttpClient
 		if ($this->checkIsIp($host)) {
 			return $host;
 		}
-		$this->addHeader('Host', $host);
 		return System::gethostbyname($host);
 	}