1 files changed, 47 insertions, 4 deletions
diff --git a/Source/WebKit/qt/WidgetApi/qwebpage.cpp b/Source/WebKit/qt/WidgetApi/qwebpage.cpp
index be8bd3edb..f8d8c0abc 100644
--- a/Source/WebKit/qt/WidgetApi/qwebpage.cpp
+++ b/Source/WebKit/qt/WidgetApi/qwebpage.cpp
@@ -3161,6 +3161,50 @@ bool QWebPage::extension(Extension extension, const ExtensionOption *option, Ext
     }
 #endif
 
+    if (extension == ErrorPageExtension) {
+        auto* errorOption = static_cast<const ErrorPageExtensionOption*>(option);
+
+        QString errorCode;
+        switch (errorOption->domain) {
+        case QWebPage::Http:
+            errorCode = tr("HTTP Error %0").arg(errorOption->error);
+            break;
+        case QWebPage::QtNetwork:
+            errorCode = tr("QtNetwork Error %0").arg(errorOption->error);
+            break;
+        case QWebPage::WebKit:
+            errorCode = tr("WebKit Error %0").arg(errorOption->error);
+            break;
+        }
+
+        QString pageHeader = errorOption->errorString;
+        if (pageHeader.isEmpty())
+            pageHeader = errorCode;
+        else if (pageHeader.endsWith(QLatin1Char('.')))
+            pageHeader.chop(1);
+
+        auto* pageOutput = static_cast<ErrorPageExtensionReturn*>(output);
+        pageOutput->baseUrl = errorOption->url;
+        QString escapedUrl = errorOption->url.toDisplayString().toHtmlEscaped();
+        pageOutput->content = QStringLiteral("<html><head>"
+            "<meta charset=\"utf-8\">"
+            "<title>%0</title>"
+            "<style>"
+            "html{font-family:sans;background:#EEE;color:#000;}"
+            "body{max-width:600px;margin:150px auto 0;padding:10px;}"
+            "pre{text-align:right;color:#999;}"
+            "</style>"
+            "</head><body>"
+            "<h1>%0</h1><hr>"
+            "<p>%1</p><pre>%2</pre>"
+            "</body></html>").arg(
+                pageHeader.toHtmlEscaped(),
+                tr("Failed to load URL %0.").toHtmlEscaped().arg(QLatin1String("<a href=\"") + escapedUrl + QLatin1String("\">") + escapedUrl + QLatin1String("</a>")),
+                errorCode.toHtmlEscaped()).toUtf8();
+
+        return true;
+    }
+
     return false;
 }
 
@@ -3172,11 +3216,10 @@ bool QWebPage::extension(Extension extension, const ExtensionOption *option, Ext
 bool QWebPage::supportsExtension(Extension extension) const
 {
 #ifndef QT_NO_FILEDIALOG
-    return extension == ChooseMultipleFilesExtension;
-#else
-    Q_UNUSED(extension);
-    return false;
+    if (extension == ChooseMultipleFilesExtension)
+        return true;
 #endif
+    return extension == ErrorPageExtension;
 }
 
 /*!