How to cache google chart using POST request method

PHP
1

I’m calling my php script that generates the google chart (POST method http://code.google.com/apis/chart/docs/post_requests.html) and has this code to output the image (the page is set to png output):

$context = stream_context_create(
array(‘http’ => array(
‘method’ => ‘POST’,
‘content’ => http_build_query($chart))));
fpassthru(fopen($url, ‘r’, false, $context));

I call the script as an image (…img src="gchart.php?..)

All works fine, but i’d like to cache the results of the above, how can i capture the output of post request and store as png file?

2

Can’t you just capture the response from fopen and use [fphp]file_put_contents[/fphp] to save it as a PNG, then render your <img> tag to point to that file?

3

Caching POST results doesn’t make sense since using POST implies that the info returned is expected to change between calls. That is what POST is for - if you know the data will always stay the same then you should be using GET so that the browser will know it is allowed to cache the results.