diff --git a/libraries/joomla/application/web.php b/libraries/joomla/application/web.php
index 14d7122d67bcc..a5256c2c73996 100644
--- a/libraries/joomla/application/web.php
+++ b/libraries/joomla/application/web.php
@@ -848,6 +848,9 @@ protected function detectRequestUri()
 			$scheme = 'http://';
 		}
 
+		// Try to acquire the server host, if set.
+		$host = isset($_SERVER['HTTP_HOST']) ? $_SERVER['HTTP_HOST'] : '';
+
 		/*
 		 * There are some differences in the way that Apache and IIS populate server environment variables.  To
 		 * properly detect the requested URI we need to adjust our algorithm based on whether or not we are getting
@@ -860,13 +863,13 @@ protected function detectRequestUri()
 		if (!empty($_SERVER['PHP_SELF']) && !empty($_SERVER['REQUEST_URI']))
 		{
 			// The URI is built from the HTTP_HOST and REQUEST_URI environment variables in an Apache environment.
-			$uri = $scheme . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];
+			$uri = $scheme . $host . $_SERVER['REQUEST_URI'];
 		}
 		// If not in "Apache Mode" we will assume that we are in an IIS environment and proceed.
 		elseif (isset($_SERVER['HTTP_HOST']))
 		{
 			// IIS uses the SCRIPT_NAME variable instead of a REQUEST_URI variable... thanks, MS
-			$uri = $scheme . $_SERVER['HTTP_HOST'] . $_SERVER['SCRIPT_NAME'];
+			$uri = $scheme . $host . $_SERVER['SCRIPT_NAME'];
 
 			// If the QUERY_STRING variable exists append it to the URI string.
 			if (isset($_SERVER['QUERY_STRING']) && !empty($_SERVER['QUERY_STRING']))
diff --git a/libraries/joomla/uri/uri.php b/libraries/joomla/uri/uri.php
index e19f815c45b6a..a61ece0a5c573 100644
--- a/libraries/joomla/uri/uri.php
+++ b/libraries/joomla/uri/uri.php
@@ -72,6 +72,9 @@ public static function getInstance($uri = 'SERVER')
 					$https = '://';
 				}
 
+				// Try to acquire the server host, if set.
+				$host = isset($_SERVER['HTTP_HOST']) ? $_SERVER['HTTP_HOST'] : '';
+				
 				/*
 				 * Since we are assigning the URI from the server variables, we first need
 				 * to determine if we are running on apache or IIS.  If PHP_SELF and REQUEST_URI
@@ -82,7 +85,7 @@ public static function getInstance($uri = 'SERVER')
 				{
 					// To build the entire URI we need to prepend the protocol, and the http host
 					// to the URI string.
-					$theURI = 'http' . $https . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];
+					$theURI = 'http' . $https . $host . $_SERVER['REQUEST_URI'];
 				}
 				else
 				{
@@ -93,7 +96,7 @@ public static function getInstance($uri = 'SERVER')
 					 *
 					 * IIS uses the SCRIPT_NAME variable instead of a REQUEST_URI variable... thanks, MS
 					 */
-					$theURI = 'http' . $https . $_SERVER['HTTP_HOST'] . $_SERVER['SCRIPT_NAME'];
+					$theURI = 'http' . $https . $host . $_SERVER['SCRIPT_NAME'];
 
 					// If the query string exists append it to the URI string
 					if (isset($_SERVER['QUERY_STRING']) && !empty($_SERVER['QUERY_STRING']))
diff --git a/modules/mod_wrapper/helper.php b/modules/mod_wrapper/helper.php
index 5afd93f63e8ce..09db71fbea106 100644
--- a/modules/mod_wrapper/helper.php
+++ b/modules/mod_wrapper/helper.php
@@ -44,8 +44,9 @@ public static function getParams(&$params)
 			// Adds 'http://' if none is set
 			if (substr($url, 0, 1) == '/')
 			{
-				// Relative url in component. use server http_host.
-				$url = 'http://' . $_SERVER['HTTP_HOST'] . $url;
+				// Relative url in component. use server http_host, if set.
+				$host = JFactory::getApplication()->input->server->getString('HTTP_HOST');
+				$url = 'http://' . $host . $url;
 			}
 			elseif (!strstr($url, 'http') && !strstr($url, 'https'))
 			{