The http headers might say where the request came from.
Not where they came from . I know that.
What client they used , I try to find.
What +Stephen Brannan was saying was that you can use the HTTP Headers to work out if the request came from Ajax or a .NET client. The User-Agent header is used to tell you what client was used, the SS clients by default have a default user-agent of:
"ServiceStack .NET Client " + Env.ServiceStackVersion
But this is overridable so could be changed to be anything.