anchor.diff:      # Rewrite top-level wordpress requests to /blog/
       set req.url = regsub(
           req.url,
  -        "^/(learn|policy|layout/footer_page_list|layout/homepage_post_list|/layout/navigation_page_list)",
  +        "^/(learn|policy|layout/footer_page_list|layout/homepage_post_list|layout/navigation_page_list)",
           "/blog/\1"
       );
       <% end %>
  
positive.code:         sprintf(buff,"%d",rand()%2 + 1);
          VRT_SetHdr(sp, HDR_REQ, "\013X-AB-Group:", buff, vrt_magic_string_end);
        }C
        # 
        if (req.http.Cookie) {
          set req.http.Cookie = req.http.Cookie ";";
        } else {
  
negative.code: 
  sub vcl_deliver {
    # make sure ab testing is part of the cookie on the way back out
    if (req.http.X-Added-AB-Group) {
      if (resp.http.Set-Cookie) {
        set resp.http.Set-Cookie = resp.http.Set-Cookie "; ab_group=" req.http.X-AB-Group "; path=/";
      }
      else {
        set resp.http.Set-Cookie = "ab_group=" req.http.X-AB-Group;
      }
    }
  }
  