wininet: Don't close proxy connections when keep-alive is specified.

dlls/wininet/http.c

diff --git a/dlls/wininet/http.c b/dlls/wininet/http.c
index 3980e9a..3f83d6d 100644
--- a/dlls/wininet/http.c
+++ b/dlls/wininet/http.c
@@ -3971,9 +3971,10 @@
     {
         WCHAR szConnectionResponse[20];
         dwBufferSize = sizeof(szConnectionResponse);
-        if (!HTTP_HttpQueryInfoW(lpwhr, HTTP_QUERY_CONNECTION, szConnectionResponse,
-                                 &dwBufferSize, NULL) ||
-            strcmpiW(szConnectionResponse, szKeepAlive))
+        if ((!HTTP_HttpQueryInfoW(lpwhr, HTTP_QUERY_CONNECTION, szConnectionResponse, &dwBufferSize, NULL) ||
+             strcmpiW(szConnectionResponse, szKeepAlive)) &&
+            (!HTTP_HttpQueryInfoW(lpwhr, HTTP_QUERY_PROXY_CONNECTION, szConnectionResponse, &dwBufferSize, NULL) ||
+             strcmpiW(szConnectionResponse, szKeepAlive)))
         {
             HTTPREQ_CloseConnection(&lpwhr->hdr);
         }