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    <p>The problem is not a server side issue, this all happens on the client and is part of the spec (I know it sounds weird).</p> <p><a href="http://dev.w3.org/html5/eventsource/" rel="nofollow">http://dev.w3.org/html5/eventsource/</a></p> <p>"When a user agent is to reestablish the connection, the user agent must run the following steps. These steps are run asynchronously, not as part of a task. (The tasks that it queues, of course, are run like normal tasks and not asynchronously.)"</p> <ol> <li> Queue a task to run the following steps: <ol> <li>If the readyState attribute is set to CLOSED, abort the task.</li> <li>Set the readyState attribute to CONNECTING.</li> <li>Fire a simple event named error at the EventSource object.</li> </ol> </li> </ol> <p>I can't see any need to have an error here, so I have modified your Init function to filter out the error event fired whilst connecting.</p> <pre><code>function init() { var CONNECTING = 0; var source; if (!!window.EventSource) { source = new EventSource('events.php'); source.addEventListener('message', function (e) { document.getElementById('output').innerHTML += e.data + '<br />'; }, false); source.addEventListener('open', function (e) { document.getElementById('output').innerHTML += 'connection opened<br />'; }, false); source.addEventListener('error', function (e) { if (source.readyState != CONNECTING) { document.getElementById('output').innerHTML += 'error<br />'; } }, false); } else { alert("Browser doesn't support Server-Sent Events"); } }</code></pre>
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    1. POHTML5 Server-Sent Events prototyping - ambiguous error and repeated polling?
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    1. USRobert
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    1. COI'm confused - aren't you just hiding the problem? From what I understand the EventSource connection should stay open until I close it. The issue here is that the connection is being regularly closed and then reopened. You say the behaviour I see is correct for when the client reestablishes the connection, but why does it need reestablishing in the first place? If the client reconnects to the server every 3 seconds this is no different from polling, and totally negates the benefits of push. I have edited my question to include the browser's output.
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    2. COOk from what i have read the server needs to keep the connection open and push the data to the client, in the case of PHP by flushing the buffer. If the server does not keep hold of the connection the event source will retry, submitting the last event id supplied by the server, this is what causes the polling that is observed. At present the spec is in draft and I don’t know why there isn’t another event to distinguish between an actual problem and reconnecting.
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    3. COAlso based on the link provided by @unludo PHP doesn’t sound like a good solution for the event source if you intend to keep the connection open as you will need to keep one PHP thread per request.
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