[Varnish] #1218: String concatenation operator '+' doesn't work on empty strings

[Varnish]

#1218: String concatenation operator '+' doesn't work on empty strings
-----------------------+----------------------
 Reporter:  jafcobend  |       Type:  defect
   Status:  new        |   Priority:  normal
Milestone:             |  Component:  varnishd
  Version:  3.0.3      |   Severity:  normal
 Keywords:             |
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 I tried doing something like this in vcl_recv():

     set req.http.Cookie = req.http.Cookie+" "+req.http.Cookie-sess;

 I discovered that this only works if req.http.Cookie already has a value.
 In my VCL it may or may not have a value by the time it gets here. I was
 able to do this instead:

     if(req.http.Cookie) {
         set req.http.Cookie = req.http.Cookie+" "+req.http.Cookie-sess;
     } else {
         set req.http.Cookie = req.http.Cookie-sess;
     }


 But it sure would be nice if the first one-liner worked.

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Ticket URL: <https://www.varnish-cache.org/trac/ticket/1218>
Varnish <https://varnish-cache.org/>
The Varnish HTTP Accelerator