diff --git a/htroot/opensearchdescription.java b/htroot/opensearchdescription.java
index 59a594ade..1e2444e8e 100644
--- a/htroot/opensearchdescription.java
+++ b/htroot/opensearchdescription.java
@@ -25,6 +25,7 @@
 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 
 import net.yacy.cora.protocol.Domains;
+import net.yacy.cora.protocol.HeaderFramework;
 import net.yacy.cora.protocol.RequestHeader;
 import net.yacy.search.Switchboard;
 import net.yacy.search.SwitchboardConstants;
@@ -39,7 +40,7 @@ public class opensearchdescription {
         String promoteSearchPageGreeting = env.getConfig(SwitchboardConstants.GREETING, "");
         if (env.getConfigBool(SwitchboardConstants.GREETING_NETWORK_NAME, false)) promoteSearchPageGreeting = env.getConfig("network.unit.description", "");
 
-        String thisaddress = header.get("Host"); // returns host:port (if not defalt http/https ports)
+        String thisaddress = header.get(HeaderFramework.HOST); // returns host:port (if not default http/https ports)
         String thisprotocol = "http";
         if (thisaddress == null) {
             thisaddress = Domains.LOCALHOST + ":" + sb.getConfig("port", "8090");
@@ -49,6 +50,9 @@ public class opensearchdescription {
                 thisprotocol = "https";
             }
         }
+        /* YaCyDefaultServelt should have filled this custom header, making sure we know here wether original request is http or https
+         *  (when default ports (80 and 443) are used, there is no way to distinguish the two schemes relying only on the Host header) */
+        thisprotocol = header.get(HeaderFramework.X_YACY_REQUEST_SCHEME, thisprotocol);
         
         final serverObjects prop = new serverObjects();
         prop.put("compareyacy", post != null && post.getBoolean("compare_yacy") ? 1 : 0);
diff --git a/source/net/yacy/cora/protocol/HeaderFramework.java b/source/net/yacy/cora/protocol/HeaderFramework.java
index 2aef01f6e..3c0f1fe62 100644
--- a/source/net/yacy/cora/protocol/HeaderFramework.java
+++ b/source/net/yacy/cora/protocol/HeaderFramework.java
@@ -113,6 +113,8 @@ public class HeaderFramework extends TreeMap<String, String> implements Map<Stri
     public static final String X_YACY_ORIGINAL_REQUEST_LINE = "X-Original-Request-Line";
     public static final String X_YACY_MEDIA_TITLE = "X-YaCy-Media-Title"; // can be attached to media files which do not have metadata; this will be used as title
     public static final String X_YACY_MEDIA_KEYWORDS = "X-YaCy-Media-Keywords"; // can be attached to media files which do not have metadata; this will be used as keywords (space-separared list of words)
+    /** Added when generating legacy request header to allow template servlets to know the original request scheme : "http" or "https" */
+    public static final String X_YACY_REQUEST_SCHEME = "X-YaCy-Request-Scheme";
 
     public static final String SET_COOKIE = "Set-Cookie";
     public static final String SET_COOKIE2 = "Set-Cookie2";
diff --git a/source/net/yacy/http/servlets/YaCyDefaultServlet.java b/source/net/yacy/http/servlets/YaCyDefaultServlet.java
index 99d431aad..a1a914b1e 100644
--- a/source/net/yacy/http/servlets/YaCyDefaultServlet.java
+++ b/source/net/yacy/http/servlets/YaCyDefaultServlet.java
@@ -686,6 +686,9 @@ public class YaCyDefaultServlet extends HttpServlet  {
         legacyRequestHeader.put(HeaderFramework.CONNECTION_PROP_CLIENTIP, request.getRemoteAddr());
         legacyRequestHeader.put(HeaderFramework.CONNECTION_PROP_PATH, target);
         legacyRequestHeader.put(HeaderFramework.CONNECTION_PROP_EXT, targetExt);
+        /* Add request scheme (http or https) to allow templates to know wether original request is http or https 
+         * (when default ports (80 and 443) are used, there is no way to distinguish the two schemes relying only on the Host header) */
+        legacyRequestHeader.put(HeaderFramework.X_YACY_REQUEST_SCHEME, request.getScheme());
         Switchboard sb = Switchboard.getSwitchboard();
         if (legacyRequestHeader.containsKey(RequestHeader.AUTHORIZATION)) {
             if (HttpServletRequest.BASIC_AUTH.equalsIgnoreCase(request.getAuthType())) {