diff --git a/defaults/solr.keys.list b/defaults/solr.keys.list
index a58052e13..ae4e97ed2 100644
--- a/defaults/solr.keys.list
+++ b/defaults/solr.keys.list
@@ -298,11 +298,14 @@ italic_txt
 #iframesscount_i
 
 ## the protocol of the url
-#url_protocol_s
+url_protocol_s
 
 ## all path elements in the url
 url_paths_sxt
 
+## the file name extension
+url_file_ext_s
+
 ## number of key-value pairs in search part of the url
 #url_parameter_i
 
diff --git a/source/net/yacy/cora/services/federated/solr/JsonResponseWriter.java b/source/net/yacy/cora/services/federated/solr/JsonResponseWriter.java
index 9bdbb9d09..d8df477fc 100644
--- a/source/net/yacy/cora/services/federated/solr/JsonResponseWriter.java
+++ b/source/net/yacy/cora/services/federated/solr/JsonResponseWriter.java
@@ -141,6 +141,10 @@ public class JsonResponseWriter implements QueryResponseWriter {
                     path.append('/').append(value.stringValue());
                     continue;
                 }
+                if (YaCySchema.url_file_ext_s.name().equals(fieldName)) {
+                    solitaireTag(writer, "ext", value.stringValue());
+                    continue;
+                }
                 if (YaCySchema.last_modified.name().equals(fieldName)) {
                     Date d = new Date(Long.parseLong(value.stringValue()));
                     solitaireTag(writer, "pubDate", HeaderFramework.formatRFC1123(d));
diff --git a/source/net/yacy/search/index/SolrConfiguration.java b/source/net/yacy/search/index/SolrConfiguration.java
index 395abc630..2a31c4e17 100644
--- a/source/net/yacy/search/index/SolrConfiguration.java
+++ b/source/net/yacy/search/index/SolrConfiguration.java
@@ -286,9 +286,8 @@ public class SolrConfiguration extends ConfigurationSet implements Serializable
         }
 
         // path elements of link
-        if (allAttr || contains(YaCySchema.url_paths_sxt)) {
-            add(doc, YaCySchema.url_paths_sxt, digestURI.getPaths());
-        }
+        if (allAttr || contains(YaCySchema.url_paths_sxt)) add(doc, YaCySchema.url_paths_sxt, digestURI.getPaths());
+        if (allAttr || contains(YaCySchema.url_file_ext_s)) add(doc, YaCySchema.url_file_ext_s, digestURI.getFileExtension());
 
         if (allAttr || contains(YaCySchema.imagescount_i)) add(doc, YaCySchema.imagescount_i, md.limage());
         if (allAttr || contains(YaCySchema.inboundlinkscount_i)) add(doc, YaCySchema.inboundlinkscount_i, md.llocal());
@@ -416,9 +415,8 @@ public class SolrConfiguration extends ConfigurationSet implements Serializable
         }
 
         // path elements of link
-        if (allAttr || contains(YaCySchema.url_paths_sxt)) {
-            add(doc, YaCySchema.url_paths_sxt, digestURI.getPaths());
-        }
+        if (allAttr || contains(YaCySchema.url_paths_sxt)) add(doc, YaCySchema.url_paths_sxt, digestURI.getPaths());
+        if (allAttr || contains(YaCySchema.url_file_ext_s)) add(doc, YaCySchema.url_file_ext_s, digestURI.getFileExtension());
 
         // get list of all links; they will be shrinked by urls that appear in other fields of the solr scheme
         Set<MultiProtocolURI> inboundLinks = yacydoc.inboundLinks();
@@ -860,13 +858,16 @@ public class SolrConfiguration extends ConfigurationSet implements Serializable
         add(solrdoc, YaCySchema.id, ASCII.String(digestURI.hash()));
         add(solrdoc, YaCySchema.sku, digestURI.toNormalform(true, false));
         final InetAddress address = digestURI.getInetAddress();
-        if (address != null) add(solrdoc, YaCySchema.ip_s, address.getHostAddress());
-        if (digestURI.getHost() != null) add(solrdoc, YaCySchema.host_s, digestURI.getHost());
+        if (contains(YaCySchema.ip_s) && address != null) add(solrdoc, YaCySchema.ip_s, address.getHostAddress());
+        if (contains(YaCySchema.host_s) && digestURI.getHost() != null) add(solrdoc, YaCySchema.host_s, digestURI.getHost());
 
         // path elements of link
-        add(solrdoc, YaCySchema.url_paths_sxt, digestURI.getPaths());
-        add(solrdoc, YaCySchema.failreason_t, failReason);
-        add(solrdoc, YaCySchema.httpstatus_i, httpstatus);
+        if (contains(YaCySchema.url_paths_sxt)) add(solrdoc, YaCySchema.url_paths_sxt, digestURI.getPaths());
+        if (contains(YaCySchema.url_file_ext_s)) add(solrdoc, YaCySchema.url_file_ext_s, digestURI.getFileExtension());
+        
+        // fail reason and status
+        if (contains(YaCySchema.failreason_t)) add(solrdoc, YaCySchema.failreason_t, failReason);
+        if (contains(YaCySchema.httpstatus_i)) add(solrdoc, YaCySchema.httpstatus_i, httpstatus);
         return solrdoc;
     }
 
diff --git a/source/net/yacy/search/index/YaCySchema.java b/source/net/yacy/search/index/YaCySchema.java
index 8b76cebc6..7baf8994c 100644
--- a/source/net/yacy/search/index/YaCySchema.java
+++ b/source/net/yacy/search/index/YaCySchema.java
@@ -141,6 +141,7 @@ public enum YaCySchema implements Schema {
 
     url_protocol_s(SolrType.string, true, true, false, "the protocol of the url"),
     url_paths_sxt(SolrType.string, true, true, true, "all path elements in the url"),
+    url_file_ext_s(SolrType.string, true, true, false, "the file name extension"),
     url_parameter_i(SolrType.integer, true, true, false, "number of key-value pairs in search part of the url"),
     url_parameter_key_sxt(SolrType.string, true, true, true, "the keys from key-value pairs in the search part of the url"),
     url_parameter_value_sxt(SolrType.string, true, true, true, "the values from key-value pairs in the search part of the url"),