diff --git a/source/net/yacy/document/Document.java b/source/net/yacy/document/Document.java
index 6ef0b6262..acc55e9d1 100644
--- a/source/net/yacy/document/Document.java
+++ b/source/net/yacy/document/Document.java
@@ -47,6 +47,8 @@ import java.util.List;
 import java.util.Map;
 import java.util.Set;
 import java.util.TreeSet;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
 
 import net.yacy.cora.date.ISO8601Formatter;
 import net.yacy.cora.document.analysis.Classification;
@@ -66,7 +68,7 @@ import net.yacy.kelondro.util.FileUtils;
 
 public class Document {
 
-    private final DigestURL source;             // the source url
+    private DigestURL source;             // the source url
     private final String mimeType;              // mimeType as taken from http header
     private final String charset;               // the charset of the document
     private final List<String> keywords;        // most resources provide a keyword field
@@ -321,6 +323,24 @@ dc_rights
         return this.source;
     }
 
+    /**
+     * rewrite the dc_source; this can be used for normalization purpose
+     * @param pattern
+     * @param replacement
+     */
+    public void rewrite_dc_source(Pattern pattern, String replacement) {
+        String u = this.source.toNormalform(false);
+        Matcher m = pattern.matcher(u);
+        if (m.matches()) {
+            u = m.replaceAll(replacement);
+            try {
+                DigestURL du = new DigestURL(u);
+                this.source = du;
+            } catch (MalformedURLException e) {
+            }
+        }
+    }
+
     /**
      * @return the supposed charset of this document or <code>null</code> if unknown
      */
diff --git a/source/net/yacy/search/Switchboard.java b/source/net/yacy/search/Switchboard.java
index 1cfe10298..c22083579 100644
--- a/source/net/yacy/search/Switchboard.java
+++ b/source/net/yacy/search/Switchboard.java
@@ -2477,6 +2477,7 @@ public final class Switchboard extends serverSwitch {
 
     private Document[] parseDocument(final Response response) throws InterruptedException {
         Document[] documents = null;
+        //final Pattern rewritePattern = Pattern.compile(";jsessionid.*");
         final EventOrigin processCase = response.processCase(this.peers.mySeed().hash);
 
         if ( this.log.isFine() ) {
@@ -2530,6 +2531,7 @@ public final class Switchboard extends serverSwitch {
         if (response.profile() != null) {
             ArrayList<Document> newDocs = new ArrayList<Document>();
             for (Document doc: documents) {
+                //doc.rewrite_dc_source(rewritePattern, "");
                 String rejectReason = this.crawlStacker.checkAcceptanceChangeable(doc.dc_source(), response.profile(), 1 /*depth is irrelevant here, we just make clear its not the start url*/);
                 if (rejectReason == null) {
                     newDocs.add(doc);
@@ -2560,7 +2562,6 @@ public final class Switchboard extends serverSwitch {
                 if (TextParser.supportsExtension(entry.getKey()) == null) hl.put(entry.getKey(), entry.getValue());
             }
             
-            
             // add all media links also to the crawl stack. They will be re-sorted to the NOLOAD queue and indexed afterwards as pure links
             if (response.profile().directDocByURL()) {
                 for (Map.Entry<DigestURL, String> entry: Document.getImagelinks(documents).entrySet()) {
@@ -2593,6 +2594,8 @@ public final class Switchboard extends serverSwitch {
                     log.info("REWRITE of url = \"" + u + "\" to \"" + u0 + "\"");
                     u = u0;
                 }
+                //Matcher m = rewritePattern.matcher(u);
+                //if (m.matches()) u = m.replaceAll("");
                 
                 // enqueue the hyperlink into the pre-notice-url db
                 try {