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HTTP Transport for servers #165
Description
I'm trying to build a very simple MCP Server base on HTTP SSE protocol (not STDIO).
This feature is implemented or not ? The MCP doesn't seem to be connected.
import Foundation
import Logging
// Configure Logger
LoggingSystem.bootstrap { label in
var handler = StreamLogHandler.standardOutput(label: label)
handler.logLevel = .trace
return handler
}
// Create logger
let logger = Logger(label: "com.example.mcp")
let server = Server(
name: "Swift Version Server",
version: "1.0.0",
capabilities: .init(tools: .init(listChanged: false))
)
let transport = HTTPClientTransport(
endpoint: URL(string: "http://localhost:8080")!,
logger:logger
)
try await server.start(transport: transport)
let tool = Tool(name: "swift_version",
description: "Returns the current Swift version",
inputSchema: .object([
"type": .string("object")
]))
await server.withMethodHandler(ListTools.self) { params in
ListTools.Result(tools: [tool])
}
await server.withMethodHandler(CallTool.self) { params in
guard params.name == tool.name else {
throw MCPError.invalidParams("Wrong tool name: \(params.name)")
}
return CallTool.Result(content: [.text(swiftVersion() ?? "No version")])
}
func swiftVersion() -> String? {
let process = Process()
process.executableURL = URL(fileURLWithPath: "/usr/bin/env")
process.arguments = ["swift", "--version"]
let outputPipe = Pipe()
process.standardOutput = outputPipe
do {
try process.run()
process.waitUntilExit()
let data = outputPipe.fileHandleForReading.readDataToEndOfFile()
return String(data: data, encoding: .utf8)
} catch {
return "Error running swift-version: \(error)"
}
}
await server.waitUntilCompleted()
Activity
sebsto commentedon Oct 8, 2025
Hello Clement,
There is no
MCPHTTPServerTransportto implement a server in this library.You need to create your own HTTP endpoint, using Vapor or Hummingbird, your own custom transport for it and bind the pieces together.
@stallent has a reasonably working implementation in his fork's branch.
Look at the thread here
#110
Based on his work, I created a minimal HTTP server with Hummingbird. I use it for request / responses. I haven't try streamable events yet. You can look at the code, but it's a heavy work in progress.
https://github.com/sebsto/agentkit (the README is not updated, look at the Example directory instead)
realmtai commentedon Nov 15, 2025
What's the purpose of
NetworkTransportactor? should the following code work?/// // Create a TCP connection to a server let connection = NWConnection( host: NWEndpoint.Host("192.168.1.034"), port: NWEndpoint.Port(23232), using: .tcp ) // Initialize the transport with the connection let transport = NetworkTransport(connection: connection) try await server.start(transport: transport) await server.waitUntilCompleted()DePasqualeOrg commentedon Jan 4, 2026
I've implemented this functionality in my PR #175. I'd love to hear your feedback if you're able to test it.