为什么此代码没有将文件下载到我的浏览器？

Question

I have been trying to generate and output a plist file to the user on demand. When the user clicks a button, I run the code below:

<?php
    header('Content-Description: File Transfer');
    header('Content-Type: application/xml');
    header('Content-Disposition: filename="Settings.plist"');

    echo '<?xml version="1.0" encoding="UTF-8"?>
          <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
          <plist version="1.0">
          <dict>
              <key>key</key>
              <string>value</string>
          </dict>
          </plist>';
 ?>

Here is the output:

What do I need to do to get the file download to initiate?

Answer 1

The syntax you're using for the Content Disposition header is wrong. It looks like you forgot to add the Content-Disposition: attachment bit.

The RFC 6266 shows the syntax through an example:

Content-Disposition: Attachment; filename=example.html

You're currently doing:

header('Content-Disposition: filename="Settings.plist"');
                            ^

This should actually be:

header('Content-Disposition: Attachment; filename="Settings.plist"');

Full code:

header('Content-Description: File Transfer');
header('Content-Type: application/xml');
header('Content-Disposition: Attachment; filename="Settings.plist"');

Refer to RFC 6266 (regarding the use of the Content-Disposition header field in the Hypertext Transfer Protocol (HTTP)) for more details.

Hope this helps!