wininet: Strip Accept-Encoding from http/1.0 requests.

dlls/wininet/http.c

@@ -118,6 +118,7 @@ static BOOL WINAPI HTTP_HttpQueryInfoW( LPWININETHTTPREQW lpwhr, DWORD
         lpdwIndex);
 static BOOL HTTP_HandleRedirect(LPWININETHTTPREQW lpwhr, LPCWSTR lpszUrl);
 static UINT HTTP_DecodeBase64(LPCWSTR base64, LPSTR bin);
+static BOOL HTTP_VerifyValidHeader(LPWININETHTTPREQW lpwhr, LPCWSTR field);
 
 
 LPHTTPHEADERW HTTP_GetHeader(LPWININETHTTPREQW req, LPCWSTR head)
@@ -636,6 +637,8 @@ static BOOL WINAPI HTTP_HttpAddRequestHeadersW(LPWININETHTTPREQW lpwhr,
         pFieldAndValue = HTTP_InterpretHttpHeader(lpszStart);
         if (pFieldAndValue)
         {
+            bSuccess = HTTP_VerifyValidHeader(lpwhr, pFieldAndValue[0]);
+            if (bSuccess)
                 bSuccess = HTTP_ProcessHeader(lpwhr, pFieldAndValue[0],
                     pFieldAndValue[1], dwModifier | HTTP_ADDHDR_FLAG_REQ);
             HTTP_FreeTokens(pFieldAndValue);
@@ -3516,6 +3519,24 @@ static BOOL HTTP_DeleteCustomHeader(LPWININETHTTPREQW lpwhr, DWORD index)
     return TRUE;
 }
 
+
+/***********************************************************************
+ *           HTTP_VerifyValidHeader (internal)
+ *
+ * Verify the given header is not invalid for the given http request
+ *
+ */
+static BOOL HTTP_VerifyValidHeader(LPWININETHTTPREQW lpwhr, LPCWSTR field)
+{
+    BOOL rc = TRUE;
+
+    /* Accept-Encoding is stripped from HTTP/1.0 requests. It is invalid */
+    if (strcmpiW(field,szAccept_Encoding)==0)
+        return FALSE;
+
+    return rc;
+}
+
 /***********************************************************************
  *          IsHostInProxyBypassList (@)
  *