Article ID: 321532
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When you use a POST method over HTTPS to access a server script that streams back a Portable Document Format (PDF) file, you may receive the following warning message:
This page contains both secure and non-secure items. Do you want to display the non-secure items?
To resolve this problem, obtain the latest service pack for Microsoft Internet Explorer 6.0. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
328548After you apply the fix, you must make sure that the Web server that you download the PDF file from sends "Accept-Ranges: bytes" in the HTTP Response Header. However, this problem still occurs when the header is sent if the PDF file is less than 8 KB.
(https://support.microsoft.com/kb/328548/ )How to obtain the latest service pack for Internet Explorer 6
To work around the problem in this case and send the header, pad the PDF file so that its size is greater than or equal to 8 KB.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section of this article.