StackOverflow2013

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15848955
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2013-04-06T09:01:36.940
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2013-04-06T09:01:36.940
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In Apache, <a href="http://httpd.apache.org/docs/2.2/mod/core.html#fileetag" rel="nofollow">ETags are handled as a core feature</a>. The ETag is computed as a hash of several values. You can use the <code>FileETag</code> directive in your <code>httpd.conf</code> or <code>.htaccess</code> file to define conditional behavior for which values to include in the hash, but as you pointed out, your options are limited to: <ul> <li><code>INode</code> - your file's i-node number on the particular server it's served from</li> <li><code>MTime</code> - the timestamp (in millis) of the server your file is served from</li> <li><code>Size</code> - the size of your file in bytes</li> <li><code>All</code> - all of the above</li> <li><code>None</code> - none of the above</li> </ul> If you want truly custom ETag generation, you would definitely be best off writing an Apache module. However if you need a quick-and-dirty fix, you can generate your own tags by routing your requests to a PHP script and appending the <code>Etag</code> header in the script. The route might look like this in your <code>httpd.conf</code> or <code>.htaccess</code> file: <pre><code>RewriteCond %{REQUEST_FILENAME} \.png$ # This example looks for .png requests RewriteRule ^(.*)$ /gentag.php?path=$1 [B] # ...and routes them to a PHP script </code></pre> The PHP script might look like this: <pre><code><? $path = $_GET['path']; // Grab the filepath from GET params $cont = file_get_contents($path); // Get file contents to hash $hash = crc32($cont); // Create your own ETag hash however you like header("Etag: $hash"); // Send the custom Etag header echo $cont; // Dump the file contents to output ?> </code></pre>
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1. POCustom etag generation
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1. PTAnswer
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1. USpieman72
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