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Is there a way to check if flash is installed in Firefox from C# code on the server? For instance when the client browser is IE, you can check
Request.Headers[‘accept’].Contains (‘application/x-shockwave-flash’)
but a Firefox request doesnt contain the same header.
Given you’ve tagged this as ‘server-side’ and talk about the client’s machine, then you may well be disappointed.
The only way to check this is with code running on the host you’re checking (i.e. the client) – of course, you could do this and transmit the answer to the server (to store in the session, for example)
Edit: It’s also worth remembering that any headers you receive (or rely on receiving) may be removed by intermediate proxies, or just plain lying (could be a bot)