Is it expected that "capture response" does not get headers when "http-request return" is used

[Aleksandar Lazic]

Hi.

I try to capture the response header "dst_conn" from "http-request return" but 
in %hs isn't the value.

```
podman logs -f haproxy-dest
[NOTICE]   (1) : New worker #1 (3) forked
<6>[04/Dec/2021:12:14:34.437] 200 58 - - LR-- {} "GET / HTTP/1.1"
<6>[04/Dec/2021:12:14:34.437] 200 58 - - LR-- {} "GET / HTTP/1.1"
<6>[04/Dec/2021:12:14:34.438] 200 58 - - LR-- {} "GET / HTTP/1.1"

```

I haven't seen any "capture" in "http-after-response".
The question is also makes sense to have a capture after "http-request return" 
as in the documenation is
written that return stops the evaluation of any other rules also from capture?

http://cbonte.github.io/haproxy-dconv/2.4/configuration.html#http-response%20return
"This stops the evaluation of the rules and immediately returns a response."

My config
```
global
        log stdout format short daemon debug
        maxconn 1

defaults
        timeout connect 1s
        timeout server 1s
        timeout client 1s

frontend http
        mode http
        log global
        log-format "[%tr] %ST %B %CC %CS %tsc %hr %hs %{+Q}r"
        # declare capture response len 4
        capture response header dst_conn len 4

        bind :::8080 v4v6

        default_backend nginx

backend nginx
        mode http
        # bind :::8081

        http-request return status 200 hdr dst_conn "%[dst_conn]"
```

Haproxy version
```
podman exec haproxy-dest haproxy -vv
HAProxy version 2.4.8-d1f8d41 2021/11/03 - https://haproxy.org/
Status: long-term supported branch - will stop receiving fixes around Q2 2026.
Known bugs: http://www.haproxy.org/bugs/bugs-2.4.8.html
Running on: Linux 5.11.0-40-generic #44~20.04.2-Ubuntu SMP Tue Oct 26 18:07:44 
UTC 2021 x86_64
Build options :
  TARGET  = linux-glibc
  CPU     = generic
  CC      = cc
  CFLAGS  = -O2 -g -Wall -Wextra -Wdeclaration-after-statement -fwrapv 
-Wno-address-of-packed-member -Wno-unused-label -Wno-sign-compare 
-Wno-unused-parameter -Wno-clobbered -Wno-missing-field-initializers 
-Wno-cast-function-type -Wtype-limits -Wshift-negative-value -Wshift-overflow=2 
-Wduplicated-cond -Wnull-dereference
  OPTIONS = USE_PCRE2=1 USE_PCRE2_JIT=1 USE_GETADDRINFO=1 USE_OPENSSL=1 
USE_LUA=1 USE_PROMEX=1
  DEBUG   =
...
```

Regards
Alex