41 lines
1.3 KiB
PHP
41 lines
1.3 KiB
PHP
<?php
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set_include_path(get_include_path() . PATH_SEPARATOR . realpath(dirname(__FILE__) . '/../../min/lib'));
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require 'HTTP/ConditionalGet.php';
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// generate content first (not ideal)
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// emulate regularly updating document
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$every = 20;
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$lastModified = round(time()/$every)*$every - $every;
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$title = 'Last-Modified is unknown : use hash of content for ETag';
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$explain = '
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<p>When Last-Modified is unknown, you can still use ETags, but you need a short
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string that is unique for that content. In the worst case, you have to generate
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all the content first, <em>then</em> instantiate HTTP_ConditionalGet, setting
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the array key <code>contentHash</code> to the output of a hash function of the
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content. Since we have the full content, we might as well also use
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<code>setContentLength(strlen($content))</code> in the case where we need to
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send it.</p>
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<p>This script emulates a document that changes every ' .$every. ' seconds.
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<br>This is version: ' . date('r', $lastModified) . '</p>
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';
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require '_include.php';
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$content = get_content(array(
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'title' => $title
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,'explain' => $explain
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));
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$cg = new HTTP_ConditionalGet(array(
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'contentHash' => substr(md5($content), 7)
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));
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if ($cg->cacheIsValid) {
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$cg->sendHeaders();
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// we're done
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exit();
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}
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$cg->setContentLength(strlen($content));
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$cg->sendHeaders();
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send_slowly($content);
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