title: Website OK on Firefox but not on Safari (kCFErrorDomainCFNetwork error 303) neither Chrome (net::ERR_SPDY_PROTOCOL_ERROR)
body: <p>Since some days, my website won't load on Safari nor Chrome on Mac OS X (at home nor on my clients computers). It's working well on Firefox (Mac OS &amp; Windows) and IE / Edge, but not Chrome (Windows).
  It was well working before that and was not updated since weeks.</p>
  
  <p>I'm facing this error on Safari</p>
  
  <pre><code>Failed to load resource: The operation couldn’t be completed. (kCFErrorDomainCFNetwork error 303.)
  </code></pre>
  
  <p>And this one on Chrome</p>
  
  <pre><code> Failed to load resource: net::ERR_SPDY_PROTOCOL_ERROR
  </code></pre>
  
  <p>It seem's to be related to HTTP/2 but I don't really know what is the problem.</p>
  
  <p>I saw that a workaround is to clear the cache and cookie.
  I did and it works on Chrome the first time I load the website, but when I navigate to another page, the error appear again.
  I also flush opened socket without effects.</p>
  
  <p>On Safari, flushing the cache and cookie has no effects.</p>
  
  <p>My hoster (OVH) tells me that the problem is in my code but I cannot figure out where could be the bug.</p>
  
  <p>Do you have any clue about that ?</p>
  
  <p>Thanks a lot</p>