Re: Unable to access HTTP request headers using microhttpd module

Yes, definitely a bug.

I opened a github issue:

https://github.com/kamailio/kamailio/issues/4369

Jurijs


On Fri, Aug 15, 2025 at 6:33 PM Jurijs Ivolga <[email protected]>
wrote:

> Hi,
>
> I'm not an expert in C and I checked module code and it looks like a bug.
>
> Your syntax seems correct.
>
> With kind regards,
>
> Jurijs
>
>
> On Fri, Aug 15, 2025 at 1:48 PM Ivan Ribakov via sr-users <
> [email protected]> wrote:
>
>> Could someone confirm if they ever had success accessing HTTP headers
>> with microhttpd module? Am I even using the correct syntax?
>>
>>
>>
>> *IVAN RIBAKOV*
>> Lead Engineer
>>
>> *__________________________________________*
>>
>> CAIT, Campus Montegancedo,
>>
>> Pozuelo de Alarcón 28223
>>
>> Madrid - Spain
>> [image: https://zaleos.net] <https://zaleos.net/> [image:
>> https://www.linkedin.com/company/18014823]
>> <https://www.linkedin.com/company/18014823>
>>
>> On Tue, 5 Aug 2025, 17:52 Ivan Ribakov via sr-users, <
>> [email protected]> wrote:
>>
>>> 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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>

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