QuincyGao created an issue (kamailio/kamailio#4176)
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### Description
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I confirmed the problem again， HTTP GET, POST without body is ok, HTTP post with json body can't return message and block. microhttpd1.0.1 installed.
``` curl -d '{"test":"2", "test2":"1"}' -H "Content-Type: application/json" -X POST http://172.16.4.111:8284 ``` kamailio.cfg ``` loadmodule "microhttpd.so"
modparam("microhttpd", "listen_addr", "172.16.4.111") modparam("microhttpd", "listen_port", 8284)
event_route[microhttpd:request] { xinfo("request: $mhttpd(method) - url: $mhttpd(url) - data: [$mhttpd(data)]\n"); mhttpd_reply("200", "OK", "text/html","<html><body>OK</body></html>"); #mhttpd_reply("200", "OK", "application/json","{"code":0}"); }
```
``` ldd /usr/local/lib64/kamailio/modules/microhttpd.so linux-vdso.so.1 => (0x00007ffda77fc000) libdl.so.2 => /lib64/libdl.so.2 (0x00007f5c6d357000) libm.so.6 => /lib64/libm.so.6 (0x00007f5c6d055000) librt.so.1 => /lib64/librt.so.1 (0x00007f5c6ce4d000) libmicrohttpd.so.12 => /usr/local/lib64/libmicrohttpd.so.12 (0x00007f5c6cc1a000) libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f5c6c9fe000) libc.so.6 => /lib64/libc.so.6 (0x00007f5c6c630000) /lib64/ld-linux-x86-64.so.2 (0x00007f5c6d765000)
ll /usr/local/lib64/libmicrohttpd.* -rw-r--r--. 1 root root 1902020 Mar 6 11:19 /usr/local/lib64/libmicrohttpd.a -rwxr-xr-x. 1 root root 998 Mar 6 11:19 /usr/local/lib64/libmicrohttpd.la lrwxrwxrwx. 1 root root 24 Mar 6 11:19 /usr/local/lib64/libmicrohttpd.so -> libmicrohttpd.so.12.62.1 lrwxrwxrwx. 1 root root 24 Mar 6 11:19 /usr/local/lib64/libmicrohttpd.so.12 -> libmicrohttpd.so.12.62.1 -rwxr-xr-x. 1 root root 992136 Mar 6 11:19 /usr/local/lib64/libmicrohttpd.so.12.62.1
```
### Troubleshooting
#### Reproduction
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#### Debugging Data
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gdb /path/to/kamailio /path/to/corefile bt full info locals list
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``` (paste your debugging data here) ```
#### Log Messages
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``` 25(2379) DEBUG: microhttpd [microhttpd_mod.c:475]: ksr_microhttpd_request(): executing event_route[microhttpd:request] (3) 25(2379) exec: *** cfgtrace:dbg_cfg_trace(): request_route=[microhttpd:request] c=[/usr/local/bin/../etc/kamailio/conf/kamailio.cfg] l=1181 a=25 n=xinfo 25(2379) INFO: <script>: request: POST - url: / - data: [{"test":"2", "test2":"1"}] 25(2379) exec: *** cfgtrace:dbg_cfg_trace(): request_route=[microhttpd:request] c=[/usr/local/bin/../etc/kamailio/conf/kamailio.cfg] l=1182 a=28 n=mhttpd_reply ```
#### SIP Traffic
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``` (paste your sip traffic here) ```
### Possible Solutions
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### Additional Information
* **Kamailio Version** - output of `kamailio -v`
``` version: kamailio 5.8.5 (x86_64/linux) ```
* **Operating System**:
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``` Centos7.9 ```