[Curl] Discard response headers when an error occurs

https://bugs.webkit.org/show_bug.cgi?id=247716

Reviewed by Fujii Hironori.

If a cURL error occurs before the response body is received,
the previously received response headers are not notified to WebCore
to avoid malfunction.

* Source/WebCore/platform/network/curl/CurlRequest.cpp:
(WebCore::CurlRequest::didReceiveHeader):
(WebCore::CurlRequest::didCompleteTransfer):
(WebCore::CurlRequest::shouldAbortConnectRequest): Deleted.
* Source/WebCore/platform/network/curl/CurlRequest.h:

Canonical link: https://commits.webkit.org/256639@main

Source/WebCore/platform/network/curl/CurlRequest.cpp

@@ -466,16 +466,16 @@ void CurlRequest::didCompleteTransfer(CURLcode result)
         return;
     }
 
-    if (needToInvokeDidReceiveResponse()) {
-        // Processing of didReceiveResponse() has not been completed. (For example, HEAD method)
-        // When completeDidReceiveResponse() is called, didCompleteTransfer() will be called again.
+    if (result == CURLE_OK) {
+        if (needToInvokeDidReceiveResponse()) {
+            // Processing of didReceiveResponse() has not been completed. (For example, HEAD method)
+            // When completeDidReceiveResponse() is called, didCompleteTransfer() will be called again.
 
-        m_finishedResultCode = result;
-        invokeDidReceiveResponse(m_response, Action::FinishTransfer);
-        return;
-    }
+            m_finishedResultCode = result;
+            invokeDidReceiveResponse(m_response, Action::FinishTransfer);
+            return;
+        }
 
-    if (result == CURLE_OK) {
         if (m_multipartHandle)
             m_multipartHandle->didComplete();