Investigate silverlight websocket client about sockjs-client HOT 4 CLOSED

A quick Google shows the situation is slightly better than Flash. You'll need a policy file on a webserver on port 943. As of Silverlight 4, it can alternatively be served from port 80. See: http://msdn.microsoft.com/en-us/library/cc645032.aspx

Given your reasons for not having a Flash transport, I guess this can be done by requiring at least Silverlight 4. Though there's still a chance of timeouts and possible delays when in development with nothing listening on port 80.

from sockjs-client.

Thanks for finding that. This raises next questions:

1. How many IE 7, 8, 9 users have silverlight 4?
2. What about https/ssl, does it use port 443?
3. Is silverlight using proxies?
4. Is opening a silverlight thing (activex?) fast enough? Is communicating with the plugin fast? How large the websocket plugin code is?
5. Loads of questions regarding timeouts and other technical details.

from sockjs-client.

Disclaimer: I'm only reading documentation, no actual experience with Silverlight here.

It gets more interesting. Something I missed is that only ports 4502-4534 are allowed when making normal socket connections in Silverlight, which is also explained in the linked MSDN article. So the proxy argument breaks there as well.

1. Here are some rough stats on install base of Silverlight 4.
2. Sockets in Silverlight have no SSL support. It looks like it can make HTTPS requests through other interfaces, but that's of no use here.
3. No idea.
4. There's a demo up. The Silverlight plugin there is apparently 15.4 KiB. No idea about load times and latency.
5. Also of no help there.

from sockjs-client.

This is a brilliant research, thanks!

The port restriction (4502-4534) is a major problem. Some more links:

• http://stackoverflow.com/questions/3971743/bypass-silverlight-tcp-port-restrictions
• http://blogs.msdn.com/b/ncl/archive/2009/06/23/why-does-silverlight-have-a-restricted-port-range-for-sockets.aspx

I'm closing this issue as: WONTFIX.

from sockjs-client.