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simik
September 21, 2023
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Internal web API Call

  • September 21, 2023
  • 10 replies
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Hi,

When I call a web API from another web API within the same server, the external url parameter value of the final web API iin the httppost request doesn't seem to work but I have to give the localhost url -  like this :localhost:8080/.../webapiname. Why is that and will this work in all environments? I understand it is not ideal to call this way, but I a little confused as to why the direct url is not working. 

    Best answer by stefanhelzle0001

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

    10 replies

    mathieud0001
    mathieud0001
    September 21, 2023

    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.

    S
    simikAuthor
    September 21, 2023

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

    mathieud0001
    mathieud0001
    September 22, 2023

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

    stefanhelzle0001
    stefanhelzle0001Answer
    September 22, 2023

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

      almuqeets268991
      almuqeets268991
      April 29, 2026

      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.

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