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PODownload page only if different from the cached version
 

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    <p>I need to include an HTML page (generated by ASP.net) in a PHP page.</p> <p>To do it I use:</p> <pre><code>echo file_get_contents("http://example.com"); </code></pre> <p>But in this way my server needs to download the page each time my page is opened.</p> <p>I'd like to add a cache system but I need to refresh the cache everytime the <em>example.com</em> content changes.<br> What is the best method (if there's any) to detect if the content is changed without download each time the entire page?</p> <p>Here the HTTP header of the remote page:</p> <pre><code>HTTP/1.1 200 OK =&gt; Cache-Control =&gt; no-cache Pragma =&gt; no-cache Content-Length =&gt; 63648 Content-Type =&gt; text/html; charset=utf-8 Expires =&gt; -1 Server =&gt; Microsoft-IIS/7.5 Set-Cookie =&gt; ASP.NET_SessionId=xxxxxxxxxxxxxxxx; path=/; HttpOnly X-Powered-By =&gt; ASP.NET X-AspNet-Version =&gt; 4.0.30319 X-UA-Compatible =&gt; chrome=1 X-CID =&gt; 2-18 Date =&gt; Thu, 12 Sep 2013 08:54:59 GMT Connection =&gt; close </code></pre> <p>Another site gives me these:</p> <pre><code>Server Response HTTP/1.1 200 OK HTTP/1.1 200 OK Cache-Control: no-cache Pragma: no-cache Content-Length: 65367 Content-Type: text/html; charset=utf-8 Expires: -1 Server: Microsoft-IIS/7.5 Set-Cookie: ARRSID=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx;Path=/;Domain=.example.com Set-Cookie: ASP.NET_SessionId=xxxxxxxxxxxxxxxxxxx; path=/; HttpOnly X-Powered-By: UrlRewriter.NET 2.0.0 X-AspNet-Version: 4.0.30319 X-Powered-By: ASP.NET X-UA-Compatible: chrome=1 X-Powered-By: ARR/2.5 X-Powered-By: ASP.NET X-CID: 1-18 Date: Thu, 12 Sep 2013 08:56:03 GMT </code></pre>
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    1. COdepends on your application and the page, maybe you can serve it from the cache and refresh the cache every hour or everyday depends on how frequently does that page change.
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    2. COCan't see a way of reading the page without downloading at least part of it. With existing files you can use `fread` to get a small part of it, but not sure that sort of 'fix' is available with `curl`.
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    3. CO@ra_htial the page has a comments system and I don't know how often people write comments.
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