Original Question
You can stream or proxy the file to your users by setting up a simple PHP download script on your server. When user hits the download.php
script below it will set the correct headers so that their browsers asks them to save a download. It will then stream the chart image from google to the users browser.
In your HTML:
<a href="download.php">Download</a>
In download.php:
header('Content-Type: image/png');
header('Content-Disposition: attachment; filename="chart.png"');
$image = file_get_contents('http://chart.apis.google.com/chart?chs=300x300&cht=qr&chld=L|0&chl=http%253A%252F%252Fnetcane.com%252Fprojects%252Fyourl%252F3');
header('Content-Length: ' . strlen($image));
echo $image;
Passing in dynamically generated chart API URLs
In your HTML:
<?php
$url = 'http://chart.apis.google.com/chart?my-generated-chart-api-url';
<a href="download.php?url=<?php echo urlencode($url); ?>">Download</a>
In download.php:
$url = '';
if(array_key_exists('url', $_GET)
and filter_var($_GET['url'], FILTER_VALIDATE_URL)) {
$url = $_GET['url'];
}
header('Content-Type: image/png');
header('Content-Disposition: attachment; filename="chart.png"');
$image = file_get_contents($url);
header('Content-Length: ' . strlen($image));
echo $image;