Unable to access HTTP request headers using microhttpd module

I'm trying to access the value of HTTP X header inside "event_route[microhttpd:request]" as follows: 
```
xlog("L_INFO", "$mhttpd(H:X-Foo)\n");
```

But I'm getting null.

I also tried non-X headers `$mhttpd(H:Content-Type)` but still no luck.

When running with DEBUG logs, I'm not seeing any hints as to what might be going wrong:

```
{ "time": "2025-08-05T15:34:33.177582092Z", "idx": 22, "pid": 33, "level": "DEBUG", "module": "core", "file": "core/sr_module.c", "line": 919, "function": "init_mod_child", "logprefix": "", "message": "idx 22 rank -2: ctl [MicroHTTPd Server Process]" }
{ "time": "2025-08-05T15:34:33.177649420Z", "idx": 22, "pid": 33, "level": "DEBUG", "module": "core", "file": "core/sr_module.c", "line": 919, "function": "init_mod_child", "logprefix": "", "message": "idx 22 rank -2: jsonrpcs [MicroHTTPd Server Process]" }
{ "time": "2025-08-05T15:34:33.177667928Z", "idx": 22, "pid": 33, "level": "DEBUG", "module": "core", "file": "core/sr_module.c", "line": 919, "function": "init_mod_child", "logprefix": "", "message": "idx 22 rank -2: usrloc [MicroHTTPd Server Process]" }
{ "time": "2025-08-05T15:34:33.177695097Z", "idx": 22, "pid": 33, "level": "DEBUG", "module": "core", "file": "core/utils/sruid.c", "line": 127, "function": "sruid_init", "logprefix": "", "message": "root for sruid is [ulcx-1-68922489-21-] (0 / 19)" }
{ "time": "2025-08-05T15:34:33.177713396Z", "idx": 22, "pid": 33, "level": "DEBUG", "module": "core", "file": "core/sr_module.c", "line": 919, "function": "init_mod_child", "logprefix": "", "message": "idx 22 rank -2: tm [MicroHTTPd Server Process]" }
{ "time": "2025-08-05T15:34:33.177742450Z", "idx": 22, "pid": 33, "level": "DEBUG", "module": "tm", "file": "callid.c", "line": 138, "function": "child_init_callid", "logprefix": "", "message": "callid: '[email protected]'" }
{ "time": "2025-08-05T15:34:33.177751949Z", "idx": 22, "pid": 33, "level": "DEBUG", "module": "core", "file": "core/sr_module.c", "line": 919, "function": "init_mod_child", "logprefix": "", "message": "idx 22 rank -2: tmx [MicroHTTPd Server Process]" }
{ "time": "2025-08-05T15:34:33.177768432Z", "idx": 22, "pid": 33, "level": "DEBUG", "module": "tmx", "file": "tmx_mod.c", "line": 249, "function": "child_init", "logprefix": "", "message": "rank is (-2)" }
{ "time": "2025-08-05T15:34:33.177777023Z", "idx": 22, "pid": 33, "level": "DEBUG", "module": "core", "file": "core/sr_module.c", "line": 919, "function": "init_mod_child", "logprefix": "", "message": "idx 22 rank -2: sl [MicroHTTPd Server Process]" }
{ "time": "2025-08-05T15:34:33.177792318Z", "idx": 22, "pid": 33, "level": "DEBUG", "module": "core", "file": "core/sr_module.c", "line": 919, "function": "init_mod_child", "logprefix": "", "message": "idx 22 rank -2: uac [MicroHTTPd Server Process]" }
{ "time": "2025-08-05T15:34:33.177807544Z", "idx": 22, "pid": 33, "level": "DEBUG", "module": "core", "file": "core/sr_module.c", "line": 919, "function": "init_mod_child", "logprefix": "", "message": "idx 22 rank -2: ndb_redis [MicroHTTPd Server Process]" }
{ "time": "2025-08-05T15:34:33.177827100Z", "idx": 22, "pid": 33, "level": "DEBUG", "module": "ndb_redis", "file": "redis_client.c", "line": 259, "function": "redisc_init", "logprefix": "", "message": "Connecting to 22.22.22.102:6379" }
{ "time": "2025-08-05T15:34:33.178143906Z", "idx": 22, "pid": 33, "level": "DEBUG", "module": "ndb_redis", "file": "redis_client.c", "line": 271, "function": "redisc_init", "logprefix": "", "message": "rsrv->ctxRedis = 0x5df7e046fb40" }
{ "time": "2025-08-05T15:34:33.178464903Z", "idx": 22, "pid": 33, "level": "DEBUG", "module": "core", "file": "core/sr_module.c", "line": 919, "function": "init_mod_child", "logprefix": "", "message": "idx 22 rank -2: htable [MicroHTTPd Server Process]" }
{ "time": "2025-08-05T15:34:33.178536771Z", "idx": 22, "pid": 33, "level": "DEBUG", "module": "htable", "file": "htable.c", "line": 267, "function": "child_init", "logprefix": "", "message": "rank is (-2)" }
{ "time": "2025-08-05T15:34:33.178576651Z", "idx": 22, "pid": 33, "level": "DEBUG", "module": "core", "file": "core/sr_module.c", "line": 919, "function": "init_mod_child", "logprefix": "", "message": "idx 22 rank -2: corex [MicroHTTPd Server Process]" }
{ "time": "2025-08-05T15:34:33.178620093Z", "idx": 22, "pid": 33, "level": "DEBUG", "module": "core", "file": "core/sr_module.c", "line": 919, "function": "init_mod_child", "logprefix": "", "message": "idx 22 rank -2: dialog [MicroHTTPd Server Process]" }
{ "time": "2025-08-05T15:34:33.178664304Z", "idx": 22, "pid": 33, "level": "DEBUG", "module": "core", "file": "core/sr_module.c", "line": 919, "function": "init_mod_child", "logprefix": "", "message": "idx 22 rank -2: rtpengine [MicroHTTPd Server Process]" }
{ "time": "2025-08-05T15:34:33.178765506Z", "idx": 22, "pid": 33, "level": "DEBUG", "module": "core", "file": "core/sr_module.c", "line": 919, "function": "init_mod_child", "logprefix": "", "message": "idx 22 rank -2: nathelper [MicroHTTPd Server Process]" }
{ "time": "2025-08-05T15:34:33.178805176Z", "idx": 22, "pid": 33, "level": "DEBUG", "module": "core", "file": "core/sr_module.c", "line": 919, "function": "init_mod_child", "logprefix": "", "message": "idx 22 rank -2: dispatcher [MicroHTTPd Server Process]" }
{ "time": "2025-08-05T15:34:33.178846034Z", "idx": 22, "pid": 33, "level": "DEBUG", "module": "core", "file": "core/sr_module.c", "line": 919, "function": "init_mod_child", "logprefix": "", "message": "idx 22 rank -2: http_client [MicroHTTPd Server Process]" }
{ "time": "2025-08-05T15:34:33.178887870Z", "idx": 22, "pid": 33, "level": "DEBUG", "module": "http_client", "file": "http_client.c", "line": 414, "function": "child_init", "logprefix": "", "message": "*** http_client module initializing process 33" }
{ "time": "2025-08-05T15:34:33.178919788Z", "idx": 22, "pid": 33, "level": "DEBUG", "module": "core", "file": "core/sr_module.c", "line": 919, "function": "init_mod_child", "logprefix": "", "message": "idx 22 rank -2: microhttpd [MicroHTTPd Server Process]" }
{ "time": "2025-08-05T15:34:33.178961414Z", "idx": 22, "pid": 33, "level": "DEBUG", "module": "microhttpd", "file": "microhttpd_mod.c", "line": 603, "function": "microhttpd_server_run", "logprefix": "", "message": "preparing to listen on 10.52.0.100 :8081" }
...
{ "time": "2025-08-05T15:34:34.375701559Z", "idx": 22, "pid": 33, "level": "DEBUG", "module": "microhttpd", "file": "microhttpd_mod.c", "line": 521, "function": "ksr_microhttpd_request", "logprefix": "", "message": "incoming data: [{\"jsonrpc\":\"2.0\",\"method\":\"core.version\",\"id\":1}]" }
{ "time": "2025-08-05T15:34:34.375729356Z", "idx": 22, "pid": 33, "level": "DEBUG", "module": "microhttpd", "file": "microhttpd_mod.c", "line": 553, "function": "ksr_microhttpd_request", "logprefix": "", "message": "executing event_route[microhttpd:request] (5)" }
{ "time": "2025-08-05T15:34:34.375793262Z", "idx": 22, "pid": 33, "level": "INFO", "module": "xlog", "file": "xlog.c", "line": 283, "function": "", "logprefix": "", "message": "<null>" }
```

Am I missing something or is this a bug?

P.S. all other pre-fetched request data is fine (I checked path and body).
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