diff --git a/htroot/gsa/searchresult.java b/htroot/gsa/searchresult.java
index e1a150cc8..6ccf143ee 100644
--- a/htroot/gsa/searchresult.java
+++ b/htroot/gsa/searchresult.java
@@ -141,10 +141,12 @@ public class searchresult {
             String origfq = post.get(CommonParams.FQ);
             String datefq = "";
             for (String dr: daterange) {
-                String from_to[] = dr.split("\\.\\.");
+                String from_to[] = dr.endsWith("..") ? new String[]{dr.substring(0, dr.length() - 2), ""} : dr.startsWith("..") ? new String[]{"", dr.substring(2)} : dr.split("\\.\\.");
                 if (from_to.length != 2) continue;
-                Date from = HeaderFramework.parseGSAFS(from_to[0]); if (from == null) continue;
-                Date to = HeaderFramework.parseGSAFS(from_to[1]); if (to == null) continue;
+                Date from = HeaderFramework.parseGSAFS(from_to[0]);
+                if (from == null) from = new Date(0);
+                Date to = HeaderFramework.parseGSAFS(from_to[1]);
+                if (to == null) to = new Date();
                 to.setTime(to.getTime() + 24L * 60L * 60L * 1000L); // we add a day because the day is inclusive
                 String z = CollectionSchema.last_modified.getSolrFieldName() + ":[" + ISO8601Formatter.FORMATTER.format(from) + " TO " + ISO8601Formatter.FORMATTER.format(to) + "]";
                 datefq = datefq.length() == 0 ? z : " OR " + z;
diff --git a/source/net/yacy/cora/protocol/RequestHeader.java b/source/net/yacy/cora/protocol/RequestHeader.java
index faee711cc..406269cfb 100644
--- a/source/net/yacy/cora/protocol/RequestHeader.java
+++ b/source/net/yacy/cora/protocol/RequestHeader.java
@@ -34,7 +34,6 @@ public class RequestHeader extends HeaderFramework {
     public static final String CONNECTION = "Connection";
     public static final String PROXY_CONNECTION = "Proxy-Connection";
     public static final String KEEP_ALIVE = "Keep-Alive";
-    public static final String USER_AGENT = "User-Agent";
 
     public static final String AUTHORIZATION = "Authorization";
     public static final String WWW_AUTHENTICATE = "WWW-Authenticate";
diff --git a/source/net/yacy/crawler/data/Cache.java b/source/net/yacy/crawler/data/Cache.java
index 05bc2b2fc..ec08d3c68 100644
--- a/source/net/yacy/crawler/data/Cache.java
+++ b/source/net/yacy/crawler/data/Cache.java
@@ -83,7 +83,7 @@ public final class Cache {
         // open the response header database
         final File dbfile = new File(cachePath, RESPONSE_HEADER_DB_NAME);
         try {
-            responseHeaderDB = new MapHeap(dbfile, Word.commonHashLength, Base64Order.enhancedCoder, 1024 * 1024, 100, ' ');
+            responseHeaderDB = new MapHeap(dbfile, Word.commonHashLength, Base64Order.enhancedCoder, 2048, 100, ' ');
         } catch (final IOException e) {
             ConcurrentLog.logException(e);
         }