innovaphone Apps SDK Developer Forum

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iqbal Thursday, 2 November 2023, 01:38 PM

Dns error on http requests while porting 13r2 to 13r3 sdk

We are migrating our app to from 13r2 sdk version to 13r3 sdk version. 13r2 version is running fine without any issue,

but with 13r3 sdk version I'm getting following error while making a http request from c++ service.

11-02 12:02:14.039 test@test_pbx.de TaskTeamsPresenceSubscription[0x1ac7710]::Start(user=0x1a10170)
11-02 12:02:14.039 test@test_pbx.de TaskHttpRequest::Start   URL: https://graph.microsoft.com
11-02 12:02:14.039 Dns::UnsuitableAddress hostName:graph.microsoft.com addr:2603:1026:3000:a0::86 service:443,(null)
11-02 12:02:14.040 Dns::UnsuitableAddress hostName:graph.microsoft.com addr:2603:1026:3000:a8::80 service:443,(null)
11-02 12:02:14.040 test@test_pbx.de TaskHttpRequest::HTTPClientShutdown http_shutdown_reason=HTTP_CONNECT_FAILED httpStatusCode=0 payload=(null)
11-02 12:02:14.040 test@test_pbx.de TaskTeamsPresenceSubscription[0x1ac7710]::TaskFailed(task=0x1ac7738)

AP Manager version: 13r2 136422 sr24

IPVA Version: 13r2 sr28 IPVA[13.6437], Bootcode[1000], Hardware[0]

there is only one IDns object per App instance.

Best Regards

iqbal

Moderator

Registered 13 years 45 days

Andreas Fink (innovaphone) Thursday, 2 November 2023, 04:17 PM

Re: Dns error on http requests while porting 13r2 to 13r3 sdk

Hello Iqbal,

it looks like the HTTP client tries two times to connect to an IPv6 address and fails. This is default behaviour. The DNS Resolver marks this two addresses as NOK (Dns::UnsuitableAddress). If the application tries again (this is what you should do in your code - a retry) the DNS will deliver other addresses that could be used by the HTTP client.

In case of graph.microsoft.com it resolves to following:

Addresses: 2603:1026:3000:a0::85
2603:1026:3000:a0::84
2603:1027:1:a8::80
2603:1026:3000:a8::81
2603:1026:3000:a0::86
2603:1026:3000:a8::80
20.190.190.100
20.190.190.101
20.190.190.102
20.190.190.99
20.190.190.103
20.190.190.96

You should try multiple times.

Other possibility is to use recent SDK version - in the last SR we have changed the order of the address types, so the IPv4 addresses are delivered first.

Best Regards

Andreas Fink

Registered 5 years 214 days

iqbal Friday, 3 November 2023, 07:59 AM

Re: Dns error on http requests while porting 13r2 to 13r3 sdk

Hi Andreas

Thanks for response.

should I retry whole http request ? or is there way to retry dns lookup and get other address?
the visual studio tells that latest sdk version is installed.
SDK v.: 137840 and I'm using 13r3 Project template

Best Regards

Iqbal

sdk_version_-_Microsoft_Visual_Studio.png

Moderator

Registered 13 years 45 days

Andreas Fink (innovaphone) Friday, 3 November 2023, 12:00 PM

1 of 1 users consider this post helpful

Re: Dns error on http requests while porting 13r2 to 13r3 sdk

Hello Iqbal,

please make sure to run "innovaphone SDK - Setup" (usually located at C:\innovaphone\sdk\setup\innovaphoneSDKSetup.exe or in the start menu).

The HTTP Client library is a low level library, so you have to take care of the retries, depending on http_shutdown_reason_t and under considerations which retry count, timeouts and backoff has to be used.

You have to perform a completely new HTTP request, if previous has failed. The addresses marked as unsuitable will be not delivered by the resolver next time, so usually DNS resolver will deliver next addresses that will be used to connect.

Best Regards

Andreas Fink

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