Test and fix #52 (#53)

* Add test to reproduce #52

* Solve issue #52 by improving url handling in SseClientTransport

* Remove unnecessary url processing

---------

Co-authored-by: Abdullatif.Ghajar <abdullatif.ghajar@jetbrains.com>

src/jvmTest/kotlin/integration/SseIntegrationTest.kt

@@ -0,0 +1,51 @@
+package integration
+
+import io.ktor.client.*
+import io.ktor.client.plugins.sse.*
+import io.ktor.server.cio.*
+import io.ktor.server.engine.*
+import io.modelcontextprotocol.kotlin.sdk.Implementation
+import io.modelcontextprotocol.kotlin.sdk.ServerCapabilities
+import io.modelcontextprotocol.kotlin.sdk.client.Client
+import io.modelcontextprotocol.kotlin.sdk.client.mcpSse
+import io.modelcontextprotocol.kotlin.sdk.server.Server
+import io.modelcontextprotocol.kotlin.sdk.server.ServerOptions
+import io.modelcontextprotocol.kotlin.sdk.server.mcp
+import kotlinx.coroutines.runBlocking
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.assertDoesNotThrow
+import io.ktor.client.engine.cio.CIO as ClientCIO
+import io.ktor.server.cio.CIO as ServerCIO
+
+class SseIntegrationTest {
+    @Test
+    fun `client should be able to connect to sse server`() { // runTest will cause network timeout issues
+        runBlocking {
+            val serverEngine = initServer()
+            try {
+                assertDoesNotThrow { initClient() }
+            } finally {
+                // Make sure to stop the server
+                serverEngine.stop(1000, 2000)
+            }
+        }
+    }
+
+    private suspend fun initClient(): Client {
+        return HttpClient(ClientCIO) { install(SSE) }.mcpSse("http://$URL:$PORT")
+    }
+
+    private fun initServer(): EmbeddedServer<CIOApplicationEngine, CIOApplicationEngine.Configuration> {
+        val server = Server(
+            Implementation(name = "sse-e2e-test", version = "1.0.0"),
+            ServerOptions(capabilities = ServerCapabilities()),
+        )
+
+        return embeddedServer(ServerCIO, host = URL, port = PORT) { mcp { server } }.start(wait = false)
+    }
+
+    companion object {
+        private const val PORT = 3001
+        private const val URL = "localhost"
+    }
+}