HtmlUnit
diff --git a/‎src/changes/changes.xml‎
Lines changed: 3 additions & 0 deletions b/‎src/changes/changes.xml‎
Lines changed: 3 additions & 0 deletions
diff --git a/‎src/main/java/org/htmlunit/html/HtmlImage.java‎
Lines changed: 4 additions & 1 deletion b/‎src/main/java/org/htmlunit/html/HtmlImage.java‎
Lines changed: 4 additions & 1 deletion
@@ -8,6 +8,9 @@
 
     <body>
         <release version="4.11.0" date="March xx, 2025" description="Bugfixes">
+            <action type="fix" dev="rbri">
+                HtmlImage onerror event is triggerd for 204 responses.
+            </action>
             <action type="fix" dev="rbri">
                 Fix various event initialization when working with WebSocket's.
             </action>
 
@@ -41,6 +41,7 @@
 import org.htmlunit.WebClient;
 import org.htmlunit.WebRequest;
 import org.htmlunit.WebResponse;
+import org.htmlunit.http.HttpStatus;
 import org.htmlunit.javascript.AbstractJavaScriptEngine;
 import org.htmlunit.javascript.PostponedAction;
 import org.htmlunit.javascript.host.dom.Document;
@@ -278,7 +279,9 @@ public void doOnLoad() {
                     downloadImageIfNeeded();
                     // if the download was a success
                     if (imageWebResponse_.isSuccess()) {
-                        loadSuccessful = true; // Trigger the onload handler
+                        if (imageWebResponse_.getStatusCode() != HttpStatus.NO_CONTENT_204) {
+                            loadSuccessful = true; // Trigger the onload handler
+                        }
                     }
                 }
                 catch (final IOException e) {