HTTP 400 on external api request from Serverless Custom App

Product Customize x Workflows
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1

Hi! I am trying to debug my application after 2.2 become deprecated. When i make any request to external host via ‘invokeTemplate’ I always get http 400:

Error: { headers: {}, errorSource: 'APP', response: 'Bad Request', status: 400 }

I built small http server to handle and log requests, but i dont see any incoming requests from the app. So as i understand, HTTP400 is platform response.
BTW, If i run my code locally with fdk run it works fine!

My test app ID is 363539. I use external host as iparam and try to make request on onAppInstall event.

manifest.json

{
  "platform-version": "2.3",
  "product": {
    "freshchat": {
      "events": {
        "onAppInstall": {
          "handler": "onAppInstallCallback"
        }
      },
      "requests": {
        "sendToExternalAPI": {}
      }
    }
  },
  "engines": {
    "node": "18.16.0",
    "fdk": "9.6.0"
  }
}

requests.json

{
"sendToExternalAPI": {
    "schema": {
      "method": "POST",
      "protocol":"https",
      "host": "<%= iparam.url %>",
      "path": "/api/",
      "headers": {
        "Content-Type": "application/json"
      }
    }
  }
}

iparams.json

{
  "url": {
    "display_name": "URL",
    "description": "Please enter the url",
    "type": "text",
    "required": true
  }
}

server.js

exports = {
  onAppInstallCallback: async function (payload){
    let res;
    try {
      res = await $request.invokeTemplate("sendToExternalAPI", {
        body: JSON.stringify({payload: JSON.stringify(payload)})
      });
    } catch (error) {
      console.error('Error:', error);
    }
    console.log(JSON.stringify(res));
    renderData();
  }
}

Can you please explain, whats wrong?

2

Error: { headers: {}, errorSource: ‘APP’, response: ‘Bad Request’, status: 400 }

I tried executing the same code with one of our internal URLs, and it worked successfully.
If the information is not sensitive, could you please share the URL you are using? Even a sandbox URL accessible over the internet would be fine.