changed error handling and refactored some code

src/main/java/com/limechain/teavm/HttpRequest.java

@@ -1,32 +1,36 @@
 package com.limechain.teavm;
 
+import lombok.extern.java.Log;
 import org.teavm.interop.Async;
 import org.teavm.interop.AsyncCallback;
 import org.teavm.jso.JSBody;
 import org.teavm.jso.JSFunctor;
 import org.teavm.jso.JSObject;
 import org.teavm.jso.core.JSError;
 
-import java.io.IOException;
+import java.util.logging.Level;
 
+@Log
 public class HttpRequest {
-    @JSFunctor
-    interface HttpRequestCallback extends JSObject {
-        void apply(JSError error, String response);
-    }
 
     @Async
-    public static native String asyncHttpRequest(String method, String url, JSObject body);
-    private static void asyncHttpRequest(String method, String url, JSObject body, AsyncCallback<String> callback) {
+    public static native String asyncHttpRequest(String method, String url, String body);
+
+    private static void asyncHttpRequest(String method, String url, String body, AsyncCallback<String> callback) {
         createAsyncHttpRequest(method, url, body, (error, response) -> {
             if (error != null) {
-                callback.error(new IOException(error.getMessage()));
+                log.log(Level.WARNING, error.getMessage());
             } else {
                 callback.complete(response);
             }
         });
     }
 
     @JSBody(params = {"method", "url", "body", "callback"}, script = "return asyncHttpRequest(method, url, body, callback);")
-    public static native void createAsyncHttpRequest(String method, String url, JSObject body, HttpRequestCallback callback);
+    public static native void createAsyncHttpRequest(String method, String url, String body, HttpRequestCallback callback);
+
+    @JSFunctor
+    private interface HttpRequestCallback extends JSObject {
+        void apply(JSError error, String response);
+    }
 }

src/main/webapp/js/http.js

@@ -5,18 +5,18 @@ async function asyncHttpRequest(method = 'GET', url, body = null, callback) {
             headers: {
                 'Content-Type': 'application/json'
             },
-            body: method === 'POST' ? JSON.stringify(body) : undefined
+            body: method === 'POST' ? body : undefined
         });
 
         if (!response.ok) {
             callback(new Error(`Request failed with status: ${response?.status}`), null);
             return;
         }
 
-        let result = await response.text();
+        const result = await response.text();
         callback(null, result);
 
     } catch (error) {
-        callback(new Error(`Error during sending request: ${error.message}`), null);
+        callback(new Error(`Error during sending request: ${error?.message}`), null);
     }
 }