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use last revision as etag to improve caching

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This commit is contained in:
Andreas Shimokawa 2020-09-02 13:53:43 +02:00
parent b06dbbe075
commit 36d7d5e1c4
1 changed files with 15 additions and 2 deletions
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17
var/www/pages/index.php
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@ -1,6 +1,6 @@
<?php <?php
function send_response($code, $message) { function send_response($code, $message = "") {
http_response_code($code); http_response_code($code);
echo $message; echo $message;
exit(); exit();
@ -83,7 +83,20 @@ if (array_key_exists($ext, $mime_types)) {
header("Content-Type: application/octet-stream"); header("Content-Type: application/octet-stream");
} }
header("Cache-Control: public, max-age=180, immutable"); #header("Cache-Control: public, max-age=10, immutable");
$command = "sh -c \"cd '$git_root' && /usr/bin/git log --format='%H' -1\"";
exec($command, $output, $retval);
if ($retval == 0 && count($output)) {
$revision=$output[0];
header('ETag: "' . $revision . '"');
if (isset($_SERVER["HTTP_IF_NONE_MATCH"])) {
$req_revision = str_replace('"', '', str_replace('W/"', '', $_SERVER["HTTP_IF_NONE_MATCH"]));
if ($req_revision === $revision) {
send_response(304);
}
}
}
## We are executing command twice (first for send_response-checking, then for actual raw output to stream), ## We are executing command twice (first for send_response-checking, then for actual raw output to stream),
## which seems wasteful, but it seems exec+echo cannot do raw binary output? Is this true? ## which seems wasteful, but it seems exec+echo cannot do raw binary output? Is this true?