EmbeddedHost#

The core hosted in a process that is not an ASP.NET Core application: a plugin or add-in, a desktop or editor process, a daemon. Three hosts over the same four methods, each about a page:

File	Host	What it has to do itself
`HttpListenerHost.cs`	HTTP through `System.Net.HttpListener`, which is in the base library	body limit, deadline (no client-abort token), 204 for a notification, status codes
`StreamHost.cs`	a named pipe (any `Stream`), newline-delimited documents both ways	framing with `JsonFramer`, a document limit, a read loop and a separate write loop, the reply separator, outbound notifications
`UiThread.cs`	a thread that owns the state, as an editor loop or UI thread does	a `SynchronizationContext` that runs every document, and every continuation inside a method, on that thread

Operations.cs binds the methods to a session of its own rather than the default session, which any other component in the process shares. notes/get answers an application error with a code outside the range JSON-RPC 2.0 reserves; wait takes its cancellation token between the JSON parameters.

dotnet run -- check          # all three hosts in process, driven by a client; exit code 0 when every check passes
dotnet run -- http           # POST http://127.0.0.1:5078/rpc/
dotnet run -- pipe           # named pipe jsonrpc-embedded
dotnet run -- ui             # the pipe host, methods run on the owning thread

curl -s -X POST http://127.0.0.1:5078/rpc/ -H "Content-Type: application/json" -d '{"jsonrpc":"2.0","method":"add","params":[1,2],"id":1}'

The embedded hosting reference walks through the three files.