Changed regex to correctly sign when SignedHeaders is missing comma

Author: streiwil

src/main/java/burp/Utility.java

@@ -210,7 +210,7 @@ private static String getSignedHeaders(String authHeader){
 
         String signedHeaders = "";
 
-        Pattern pattern = Pattern.compile("SignedHeaders=(.*?),");
+        Pattern pattern = Pattern.compile("SignedHeaders=(.*?)[,\\s]");
 
         Matcher matcher = pattern.matcher(authHeader);
         if (matcher.find()){