Internal web API Call

RE: Internal web API Call

almuqeets268991 — Wed, 29 Apr 2026 10:30:25 GMT

This usually happens because external URLs route through DNS, public IP, and network security layers. In many setups, an SMS firewall or network firewall can block or restrict these loopback requests.

localhost works because it bypasses those layers and stays inside the server.

But this isn’t reliable for all environments, especially in cloud or microservices setups.
Best practice: Avoid internal HTTP calls and use direct service communication.

RE: Internal web API Call

simik — Fri, 22 Sep 2023 18:02:43 GMT

Mathieu Drouin, thanks for the response. I will check with network team on this and see.

RE: Internal web API Call

Mathieu Drouin — Fri, 22 Sep 2023 17:57:33 GMT

If the FQDN doesn't work, that means the machine can't resolve that domain. As I mentioned before, there are 2 possibilites:

1. There is an issue with DNS resolution on the host machine.

2. There is a firewall preventing communication to the outside.

RE: Internal web API Call

simik — Fri, 22 Sep 2023 17:37:46 GMT

Yes FQDN did not work from within Appian. I tried creating an integration to call the webAPI. It does not work with the https url on the web API but works if I give like this : localhost:8080/.../ij1BEQ

Does not work from integration or another web API: https://smm-gd-uat.test.fy.com/suite/webapi/ij1BE

Works from soapUI: https://smm-gd-uat.test.fy.com/suite/webapi/ij1BE

RE: Internal web API Call

Mathieu Drouin — Fri, 22 Sep 2023 16:46:35 GMT

I would assume something like DNS like Stefan mentioned or perhaps a firewall issue?

You tried using an FQDN and that didn't work, correct?

RE: Internal web API Call

simik — Fri, 22 Sep 2023 14:26:08 GMT

I get timeout error :[responseCode=500, responseBody=The host did not accept the connection within timeout of 5000 ms]

RE: Internal web API Call

Stefan Helzle — Fri, 22 Sep 2023 06:53:29 GMT

This looks like an issue with local DNS resolution. I suggest to contact your sys admins.

RE: Internal web API Call

Mathieu Drouin — Fri, 22 Sep 2023 03:35:23 GMT

What error do you get when you use a direct url?

RE: Internal web API Call

simik — Thu, 21 Sep 2023 22:52:38 GMT

Yes, that's right, this is for on-premise.

RE: Internal web API Call

Mathieu Drouin — Thu, 21 Sep 2023 22:05:10 GMT

I'm assuming this is for an on-premise installation? In the cloud, you can call an Appian API from within Appian with no issues.