Re: Unable to access HTTP request headers using microhttpd module

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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