Invalid value when making a web request

You can onlyy use http for "local host" (127.0.0.1), which means the service is on your phone.  Otherwise you need https.

See https://forums.garmin.com/developer/connect-iq/i/bug-reports/unable-to-use-http-on-192-168-x-x

If it isn't possible, is it possible to trigger a function in react native that calls this http address by doing a onTap or something else on the Garmin widget? (I'm pretty sure the answer will be no but still asking anyway)

Based on android vs iOS, it's the phone itself that requires https.

I'm coming back to this post because I had put the garmin project aside to work on the http bridge. Now I have a http bridge on my react native app but I still can't make calls on Garmin. I used this code with https that I found in a sample in the garmin sdk to test if it works but it didn't work in my widget (but the sample app itself works)

import Toybox.System;
import Toybox.Communications;
import Toybox.Lang;

class JsonTransactionTest {
    function onReceiveTest(responseCode as Number, data as Null or Dictionary or String) as Void{
        if (responseCode == 204) {
            System.println("Request Successful");                 
        } else {
            System.println("Response: " + responseCode);            
        }

    }

    function makeRequestLocalHost() as Void 
    {
        var options = {
            :responseType => Communications.HTTP_RESPONSE_CONTENT_TYPE_JSON,
            :headers => {
                "Content-Type" => Communications.REQUEST_CONTENT_TYPE_URL_ENCODED
            }
        };
        Communications.makeWebRequest(
        "https://jsonplaceholder.typicode.com/todos/115",
        {},
        options,
        method(:onReceiveTest));
    }
}

After this I found this post for widget https://forums.garmin.com/developer/connect-iq/f/discussion/167914/could-not-find-symbol-method#

So in my code it would be like this

        var callable =new Method($,:onReceiveTest);
         Communications.makeWebRequest(
            "https://jsonplaceholder.typicode.com/todos/115",
            {},
            options,
           callable);

but with this I have this error on compil

Invalid '$.Toybox.Lang.Method' passed as parameter 4 of type 
'PolyType<(callback(responseCode as $.Toybox.Lang.Number,
data as Null or $.Toybox.Lang.Dictionary or $.Toybox.Lang.String) as Void)
or (callback(responseCode as $.Toybox.Lang.Number,
data as Null or $.Toybox.Lang.Dictionary or $.Toybox.Lang.String, 
context as $.Toybox.Lang.Object) as Void)>'.

So I tried to add "context as Object" in onReceiveTest in the params but I have the same error

Ok so with the sdk 4.1.3, I succeed to go past the Communications.makeWebRequest with the 

var callable = new Method($,:onReceiveTest)

but it still crash afterwards and it doesn't do the webrequest.

And I have this warning for the var callable

Unable to detect scope 'Method' for the symbol 'initialize'.

4.1.3 doesn't have type checking turned on my default.

Try changing

var callable = new Method($,:onReceiveTest)

to

var callable = method(:onReceiveTest)

okok but when I do what you say I have

Error: Invalid Value
Details: Failed invoking <symbol>

Since there isn't a line number, add some println calls including on inReceive..  

    public function onReceiveTest(responseCode as Number, data as Null or Dictionary or String,context as Object) as Void{
        System.println("onReceiveTest() called \n");
        System.print(responseCode);
        if (responseCode == 200) {  
         
            System.println("Request Successful \n");                 
        } else {
           
            System.println("Response: " + responseCode);            
        }

    }
   

     function makeRequest() as Void {
           var options = {
            :responseType => Communications.HTTP_RESPONSE_CONTENT_TYPE_JSON,
            :headers => {
                "Content-Type" => Communications.REQUEST_CONTENT_TYPE_URL_ENCODED
            }
        };
        System.print("before callable \n");
        var callable = method(:onReceiveTest);
        System.print("before makeWebRequest() \n");
         Communications.makeWebRequest(
            "https://jsonplaceholder.typicode.com/todos/115",
            {},
            options,
           callable);
        System.println("makeRequest() done \n"); 
    }

and the result

initialize 
onTap
before callable 

don't use context

https://forums.garmin.com/developer/connect-iq/i/bug-reports/not-enough-arguments-error-in-onreceive-after-makewebrequest