title: Server sent events and browser limits
body: <p>I have a web application that listens for Server Sent Events. While I was working and testing with multiple windows open, things were not working and I banged my head for several times looking in the wrong direction: eventually, I realized that the problem was concurrent connections.</p>
  
  <p>However I was testing a very limited number and even if I am running the test on Apache (I know, I should use node).</p>
  
  <p>I then, switched browser and noticed something really interesting: apparently Chrome limits Server Sent Events connections to 4-5, while Opera doesn't. Firefox, on the other hand, after 4-5 simultaneous connections, refuses to load <strong>any</strong> other page.</p>
  
  <p>What is the reason behind this? Does the limit only apply to SSE connections from the same source, or would it be the same if I were to test open them from a different domain? Is there any chance that I am misusing SSE and this is actually blocking the browsers, or this is a known behaviour? Is there any way around it?</p>