[sr-dev] [kamailio/kamailio] REGISTER with http_async_client (Issue #3009)

[cyril-rm]

Hi there,

I have a weird issue with kamailio (latest docker image kamailio-ci:5.5.2-alpine) and http_async_client.

Before posting a lot of logs, let me describe what I want to achieve.

I have a Kamailio and a SIP Phone.

The SIP phone sends a REGISTER to kamailio, then in my routing block, I check if I have an Authorization header.

Since I don't have an Authorization (first message), I use "www_challenge()".
This replies to the SIP phone, and then the SIP phone sends a new REGISTER with the correct Authorization header.

So far so good.

Now, when I get the REGISTER with Authorization header, I want to ask an HTTP endpoint if this user is allowed to connect and check the password using http_async_query().

The problem is that when the transaction resumes, the tmx module is unhappy and throws this error :

`30(36) CRITICAL: tmx [t_var.c:546]: pv_get_tm_reply_code(): no picked branch (-1) for a final response in MODE_ONFAILURE
`
And a 500 error is sent back to the sip phone.
The AUTH_REPLY route is still called and I can use the $http* values.

it seems that my AUTH_REPLY route is called but considered as a "failure_route"

`19(27) exec: *** cfgtrace:dbg_cfg_trace(): failure_route=[AUTH_REPLY] c=[/etc/kamailio/kamailio.cfg] l=665 a=16 n=if
`
Do you see something that I am doing wrong or missing in my logic?
Is pausing/resuming to use the async http client is allowed if I'm handling a REGISTER transaction?

Here's a simplified version of my routing block (not far from reality):

```

request_route{
route(AUTH);

route[AUTH]{
    if (is_method("REGISTER"){
        if(no_auth_header){
            www_challenge("$td","1");
            exit;
        }
        else{
            t_newtran();
            http_async_query("http://xxx.xxx.xxx.xxx:9000/auth?foo=bar", "AUTH_REPLY");
        }
    }
}

route[AUTH_REPLY]{
    xlog("L_INFO", "route[HTTP_REPLY]: status $http_rs\n");
}

}
```


Best regards!


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