Treat fewer responses as fatal failures

* Relies on errorExtension instead of loadFinished
* Ignores errors from canceled requests

src/UnsupportedContentHandler.cpp

@@ -10,23 +10,18 @@ UnsupportedContentHandler::UnsupportedContentHandler(WebPage *page, QNetworkRepl
 }
 
 void UnsupportedContentHandler::handleUnsupportedContent() {
-  QVariant contentMimeType = m_reply->header(QNetworkRequest::ContentTypeHeader);
-  if(contentMimeType.isNull()) {
-    this->finish(false);
-  } else {
-    this->loadUnsupportedContent();
-    this->finish(true);
-  }
+  this->renderNonHtmlContent();
+  this->finish();
   this->deleteLater();
 }
 
-void UnsupportedContentHandler::loadUnsupportedContent() {
+void UnsupportedContentHandler::renderNonHtmlContent() {
     QByteArray text = m_reply->readAll();
     m_page->mainFrame()->setContent(text, QString("text/plain"), m_reply->url());
 }
 
-void UnsupportedContentHandler::finish(bool success) {
+void UnsupportedContentHandler::finish() {
     connect(m_page, SIGNAL(loadFinished(bool)), m_page, SLOT(loadFinished(bool)));
     m_page->networkAccessManagerFinishedReply(m_reply);
-    m_page->loadFinished(success);
+    m_page->loadFinished(true);
 }

src/UnsupportedContentHandler.h

@@ -13,6 +13,6 @@ class UnsupportedContentHandler : public QObject {
   private:
     WebPage *m_page;
     QNetworkReply *m_reply;
-    void loadUnsupportedContent();
-    void finish(bool success);
+    void renderNonHtmlContent();
+    void finish();
 };

src/WebPage.cpp

@@ -11,6 +11,7 @@
 
 WebPage::WebPage(WebPageManager *manager, QObject *parent) : QWebPage(parent) {
   m_loading = false;
+  m_failed = false;
   m_manager = manager;
   m_uuid = QUuid::createUuid().toString();
   m_lastStatus = 0;
@@ -162,8 +163,10 @@ void WebPage::loadStarted() {
 }
 
 void WebPage::loadFinished(bool success) {
+  Q_UNUSED(success);
   m_loading = false;
-  emit pageFinished(success);
+  emit pageFinished(!m_failed);
+  m_failed = false;
 }
 
 bool WebPage::isLoading() const {
@@ -221,6 +224,7 @@ bool WebPage::extension(Extension extension, const ExtensionOption *option, Exte
   else if (extension == QWebPage::ErrorPageExtension) {
     ErrorPageExtensionOption *errorOption = (ErrorPageExtensionOption*) option;
     m_errorPageMessage = " because of error loading " + errorOption->url.toString() + ": " + errorOption->errorString;
+    m_failed = true;
     return false;
   }
   return false;
@@ -248,8 +252,12 @@ QString WebPage::pageHeaders() {
 }
 
 void WebPage::handleUnsupportedContent(QNetworkReply *reply) {
-  UnsupportedContentHandler *handler = new UnsupportedContentHandler(this, reply);
-  Q_UNUSED(handler);
+  QVariant contentMimeType = reply->header(QNetworkRequest::ContentTypeHeader);
+  if(!contentMimeType.isNull()) {
+    triggerAction(QWebPage::Stop);
+    UnsupportedContentHandler *handler = new UnsupportedContentHandler(this, reply);
+    Q_UNUSED(handler);
+  }
 }
 
 bool WebPage::supportsExtension(Extension extension) const {

src/WebPage.h

@@ -57,6 +57,7 @@ class WebPage : public QWebPage {
     QString m_capybaraJavascript;
     QString m_userAgent;
     bool m_loading;
+    bool m_failed;
     QString getLastAttachedFileName();
     void loadJavascript();
     void setUserStylesheet();