diff --git a/classes/Utils.php b/classes/Utils.php
index a5116f06df60042e0040171e6f30bb6c48ba400e..dd6a8d2991c170f8dea10e404f04521dcac66d59 100644
--- a/classes/Utils.php
+++ b/classes/Utils.php
@@ -468,10 +468,26 @@ class Utils{
   	  	}*/
   	  }else{
   	  	if(isset($value['uri']) && $value['uri'] == 1){
-  	  	  if($conf['mirror_external_uris']){
+  	  	  if($conf['mirror_external_uris'] != false){
   	  	  	$value['mirroredUri'] = $value['value'];
   	  	  }
-  	  	  $value['value'] = preg_replace("|^".$conf['ns']['local']."|", $conf['basedir'], $value['value']);
+  	  	  if(is_boolean($conf['mirror_external_uris'])){
+  	  	  	$value['value'] = preg_replace("|^".$conf['ns']['local']."|", $conf['basedir'], $value['value']);
+  	  	  }elseif(is_string($conf['mirror_external_uris'])){
+  	  	  	$value['value'] = preg_replace("|^".$conf['mirror_external_uris']."|", $conf['basedir'], $value['value']);
+  	  	  }elseif(is_array($conf['mirror_external_uris'])){
+  	  	  	foreach($conf['mirror_external_uris'] as $v){
+  	  	  	  $aux = preg_replace("|^".$conf['mirror_external_uris']."|", $conf['basedir'], $value['value']);
+  	  	  	  if($aux != $value['value']]){
+  	  	  	  	$value['value'] = $aux;
+  	  	  	  	break;
+  	  	  	  }
+  	  	  	}	  	  	
+  	  	  }else{
+  	  	  	Utils::send500("Error in mirroring configuration");
+  	  	  	exit(1);
+  	  	  }
+  	  	  
   	  	  $value['curie'] = Utils::uri2curie($value['value']);
   	  	  $array[$key] = $value;
   	  	}  	  	  	  	
diff --git a/classes/modules/serviceModule.php b/classes/modules/serviceModule.php
index a791cf233adc06c943404a109bbf867de90c66aa..b4ca89100369351dd5356e0f7018d91e5f3fcbc1 100644
--- a/classes/modules/serviceModule.php
+++ b/classes/modules/serviceModule.php
@@ -64,7 +64,7 @@ class ServiceModule extends abstractModule{
   	  $prefixHeader = array();
   	  
   	  for($i=0;$i<sizeof($params);$i++){
-  	  	if($conf['mirror_external_uris']){
+  	  	if($conf['mirror_external_uris'] != false){
   	  	  $altUri = Utils::curie2uri($params[$i]);
   	  	  $altUri = preg_replace("|^".$conf['basedir']."|", $conf['ns']['local'], $altUri);
   	  	  $params[$i] = Utils::uri2curie($altUri);
diff --git a/classes/modules/typeModule.php b/classes/modules/typeModule.php
index 02f6433cd5740c10b3835898e77291374cf83099..fd13cc9e2ec0b297edf4e9ac0dd63221bbb80b06 100644
--- a/classes/modules/typeModule.php
+++ b/classes/modules/typeModule.php
@@ -47,7 +47,7 @@ class TypeModule extends abstractModule{
   	}
   	
   	$uri = $res;
-  	if($conf['mirror_external_uris']){
+  	if($conf['mirror_external_uris'] != false){
   	  $localUri = preg_replace("|^".$conf['ns']['local']."|", $conf['basedir'], $res);
   	}
   	
diff --git a/classes/modules/uriModule.php b/classes/modules/uriModule.php
index 1bb02a68ec757ad892b9c33a64c9cf0591f0d37f..e9c222555154bec014f10ee19e16e5ab03e68b6c 100644
--- a/classes/modules/uriModule.php
+++ b/classes/modules/uriModule.php
@@ -67,7 +67,7 @@ class UriModule extends abstractModule{
   	}
   	
   	$uri = $res;
-  	if($conf['mirror_external_uris']){
+  	if($conf['mirror_external_uris'] != false){
   	  $localUri = preg_replace("|^".$conf['ns']['local']."|", $conf['basedir'], $res);
   	}
   	
diff --git a/index.php b/index.php
index 7bd8b7fc1fcb446a7347d0fa4b3a20fa89138cbe..ecf54b9bd0f8011c9afccd06b5bff358a7baaa7e 100755
--- a/index.php
+++ b/index.php
@@ -59,9 +59,20 @@ if($uri == $conf['basedir']){
 }
 
 //Configure external URIs if necessary
-if($conf['mirror_external_uris']){
-  $uri = $conf['ns']['local'].$_GET['q'];
+if($conf['mirror_external_uris'] != false){
   $localUri = $conf['basedir'].$_GET['q'];
+  
+  if(is_boolean($conf['mirror_external_uris'])){
+  	$uri = $conf['ns']['local'].$_GET['q'];
+  }elseif(is_string($conf['mirror_external_uris'])){
+  	$uri = $conf['mirror_external_uris'].$_GET['q'];
+  }elseif(is_array($conf['mirror_external_uris'])){
+  	$uri = $conf['ns']['local'].$_GET['q'];  	  	
+  }else{
+  	Utils::send500("Error in mirroring configuration");
+  	exit(1);
+  }
+  
 }
 
 
diff --git a/install.sh b/install.sh
index 65619b531916770ace037327479e9035d10e0e1e..5dfc13d03e8eef7fb5a1d01b6ffc11bdcf8d379a 100755
--- a/install.sh
+++ b/install.sh
@@ -53,7 +53,7 @@ while [ "$everything_ok" != "y" ]; do
   if [[ "$basedir" =~ ^"$ns" ]]; then
     external="false"
   else
-    external="true"
+    external=$ns
     extra="\$conf['ns']['base']   = '$basedir';"
   fi