If your browser shows red warning on start by using HTML5 client
It means that your browser does not support Websockets or your browser does not support Canvas.
Such browsers that do not support these technologies are IE6, IE7, IE8, IE9 and need FLASH to emulate these features.
Browsers supporting Websocket and Canvas
| Browsers | Canvas | Websocket |
|---|---|---|
| FireFox | Full | Full beginning by version 4 |
| Chrome | Full | Full in most known versions on PC’s |
| Opera | Full | Full in most newest versions |
| IE6 | Flash | Flash (emulated and no proxy support) |
| Flash | XHR (with proxy support) | |
| IE7 | Flash | Flash (emulated and no proxy support) |
| Flash | XHR (with proxy support) | |
| IE8 | Flash | Flash (emulated and no proxy support) |
| Flash | XHR (with proxy support) | |
| IE9 | Flash | Flash (emulated and no proxy support) |
| Flash | XHR (with proxy support) | |
| IE10 | Full | Full |
| Android native | Full | XHR |
| Opera mobile | Full | Full in most newest versions |
| Firefox mobile | Full | Full |
| Safari mobile | Full | Full in most newest versions up iOS4, else emulated via XHR |
If your browser automatically reloads the pages to HTTPS address
It means that Websockets transport is not supported. This is the case on several Android native mobile browsers.
It is due to the fact that the browser automatically switches to XHR transport.
But because this transport layers on long distances with HTTP protocol, each request creates new connection. It is very slow and unstable to create new connections (up to 20 new connections per second), therefore to avoid this instability the program is conceived so that the page reloads automatically to HTTPS address to enforce HTTPS connection.
Physically you also get mostly persistent secured connection and much more stable on long distances. So the logic of browser reuses already established SSL connection instead of creating a new connection like by the use of HTTP protocol.
This behavior can be changed by the following option inside Clients\www\software\html5.html
var forcesslforxhr = false;
But it is absolutely not recommended to disable the usage of SSL in XHR mode.
