[Varnish] #1625: if(req.backend_hint == b1) compiles, but does nothing

[Varnish]

#1625: if(req.backend_hint == b1) compiles, but does nothing
-------------------------+--------------------
 Reporter:  huguesalary  |       Type:  defect
   Status:  new          |   Priority:  normal
Milestone:               |  Component:  build
  Version:  4.0.2        |   Severity:  normal
 Keywords:               |
-------------------------+--------------------
 In vcl_deliver, I'm currently trying to detect which backend a request was
 sent to.

 I originally tried to detect which **director** a request was assigned to,
 but I found this bug report: https://www.varnish-
 cache.org/trac/ticket/1502 and realized that doing {{{ if (
 req.backend_hint == name-of-director ) { } }}} is not possible, and **will
 never be**.

 However, the following code snippet compiles correctly, but does not
 actually work:

 {{{

 backend b0 {
         .host = "127.0.0.1";
         .port = "80";
 }
 backend b1 {
         .host = "127.0.0.1";
         .port = "80";
 }

 sub vcl_init {
         new a = directors.round_robin();
         a.add_backend(b0);

         new b = directors.round_robin();
         b.add_backend(b1);
 }

 sub vcl_recv {
         if(std.random(1,100) <= 50) {
                 set req.backend_hint = a.backend();
         } else {
                 set req.backend_hint = b.backend();
         }
 }

 sub vcl_deliver {
         if(req.backend_hint == b1)
         {
                 set resp.http.Test = "something;
         } else {
                 set resp.http.Test = "something else";
         }
 }
 }}}

 The {{{ if }}} condition in //vcl_deliver// always fails and executes the
 {{{ else }}}. My guess is that my code is not valid (and will never be),
 however, if that is the case, I'd expect it to not compile.

-- 
Ticket URL: <https://www.varnish-cache.org/trac/ticket/1625>
Varnish <https://varnish-cache.org/>
The Varnish HTTP Accelerator