wininet: Handle HTTP 303 redirects.

dlls/wininet/http.c

diff --git a/dlls/wininet/http.c b/dlls/wininet/http.c
index 23686f2..05e95eb 100644
--- a/dlls/wininet/http.c
+++ b/dlls/wininet/http.c
@@ -874,7 +874,7 @@
     {
         DWORD dwCode,dwCodeLength=sizeof(DWORD);
         if(HTTP_HttpQueryInfoW(lpwhr,HTTP_QUERY_FLAG_NUMBER|HTTP_QUERY_STATUS_CODE,&dwCode,&dwCodeLength,NULL) &&
-            (dwCode==302 || dwCode==301))
+            (dwCode==302 || dwCode==301 || dwCode==303))
         {
             WCHAR szNewLocation[INTERNET_MAX_URL_LENGTH];
             dwBufferSize=sizeof(szNewLocation);