### Description When calling the async_route() from event_route[xhttp:request], an error occurs.
ERROR: tm [t_lookup.c:769]: t_lookup_request(): too few headers ERROR: async [async_sleep.c:238]: async_sleep(): cannot create the transaction
#### Reproduction The problem is reproducible. Below is a fragment of the configuration file. ... listen=tcp:192.168.3.115:8080 loadmodule "xhttp.so" loadmodule "async.so" ...
event_route[xhttp:request] { async_route("TEST", "2"); exit; }
route[TEST] { xhttp_reply("200", "OK", "text/html", "<html><body>URL $hu</body></html>\r\n"); exit; }
Making a HTTP-request:
curl -X POST http://192.168.3.115:8080/test \ -H "Content-Type: application/json" \ -d '{"test": 1}'
#### Log Messages
[messages.zip](https://github.com/kamailio/kamailio/files/13994226/messages.zip)
### Additional Information
#kamailio -v version: kamailio 5.7.3 (x86_64/linux) e4d96b flags: USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MMAP, PKG_MALLOC, MEM_JOIN_FREE, Q_MALLOC, F_MALLOC, TLSF_MALLOC, DBG_SR_MEMORY, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLOCKLIST, HAVE_RESOLV_RES, TLS_PTHREAD_MUTEX_SHARED ADAPTIVE_WAIT_LOOPS 1024, MAX_RECV_BUFFER_SIZE 262144, MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB poll method support: poll, epoll_lt, epoll_et, sigio_rt, select. id: e4d96b compiled on 12:59:36 Nov 17 2023 with gcc 4.8.5
* **Operating System**:
#cat /etc/redhat-release CentOS Linux release 7.9.2009 (Core)