wininet: Remove custom content-length/type headers from redirects.

[Dan Hipschman]

When we get redirected we should not send custom Content-Type/Length to
the new location.  E.g., if we are redirected from a POST with a
Content-Length to a GET with no message body, this can cause the wine
app to hang while the remote host waits for the non-existent data to be
transferred.

---
 dlls/wininet/http.c |   11 +++++++++++
 1 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/dlls/wininet/http.c b/dlls/wininet/http.c
index c47a994..3f50d5c 100644
--- a/dlls/wininet/http.c
+++ b/dlls/wininet/http.c
@@ -2861,10 +2861,13 @@ static BOOL HTTP_GetRequestURL(WININETHTTPREQW *req, LPWSTR buf)
  */
 static BOOL HTTP_HandleRedirect(LPWININETHTTPREQW lpwhr, LPCWSTR lpszUrl)
 {
+    static const WCHAR szContentType[] = {'C','o','n','t','e','n','t','-','T','y','p','e',0};
+    static const WCHAR szContentLength[] = {'C','o','n','t','e','n','t','-','L','e','n','g','t','h',0};
     LPWININETHTTPSESSIONW lpwhs = lpwhr->lpHttpSession;
     LPWININETAPPINFOW hIC = lpwhs->lpAppInfo;
     BOOL using_proxy = hIC->lpszProxy && hIC->lpszProxy[0];
     WCHAR path[INTERNET_MAX_URL_LENGTH];
+    int index;
 
     if(lpszUrl[0]=='/')
     {
@@ -3051,6 +3054,14 @@ static BOOL HTTP_HandleRedirect(LPWININETHTTPREQW lpwhr, LPCWSTR lpszUrl)
         }
     }
 
+    /* Remove custom content-type/length headers on redirects.  */
+    index = HTTP_GetCustomHeaderIndex(lpwhr, szContentType, 0, TRUE);
+    if (0 <= index)
+        HTTP_DeleteCustomHeader(lpwhr, index);
+    index = HTTP_GetCustomHeaderIndex(lpwhr, szContentLength, 0, TRUE);
+    if (0 <= index)
+        HTTP_DeleteCustomHeader(lpwhr, index);
+
     return TRUE;
 }