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feat: support streamable http transport (#243)

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Adds support for the new StreamableHttp transport. I'm not aware of any
clients that implement it, but somebody's gotta make the start! Once
some clients support it, we can also advertise it in the README.
This commit is contained in:
Simon Knott
2025-04-28 11:11:31 +02:00
committed by GitHub
parent 7256ee3701
commit bf7dbabca4
5 changed files with 181 additions and 109 deletions
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60
tests/sse.spec.ts
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@@ -16,27 +16,45 @@
import { spawn } from 'node:child_process';
import path from 'node:path';
import { test } from './fixtures';
import { test as baseTest } from './fixtures';
import { expect } from 'playwright/test';
test('sse transport', async () => {
const cp = spawn('node', [path.join(__dirname, '../cli.js'), '--port', '0'], { stdio: 'pipe' });
try {
let stdout = '';
const url = await new Promise<string>(resolve => cp.stdout?.on('data', data => {
stdout += data.toString();
const match = stdout.match(/Listening on (http:\/\/.*)/);
if (match)
resolve(match[1]);
}));
const test = baseTest.extend<{ serverEndpoint: string }>({
serverEndpoint: async ({}, use) => {
const cp = spawn('node', [path.join(__dirname, '../cli.js'), '--port', '0'], { stdio: 'pipe' });
try {
let stdout = '';
const url = await new Promise<string>(resolve => cp.stdout?.on('data', data => {
stdout += data.toString();
const match = stdout.match(/Listening on (http:\/\/.*)/);
if (match)
resolve(match[1]);
}));
// need dynamic import b/c of some ESM nonsense
const { SSEClientTransport } = await import('@modelcontextprotocol/sdk/client/sse.js');
const { Client } = await import('@modelcontextprotocol/sdk/client/index.js');
const transport = new SSEClientTransport(new URL(url));
const client = new Client({ name: 'test', version: '1.0.0' });
await client.connect(transport);
await client.ping();
} finally {
cp.kill();
}
await use(url);
} finally {
cp.kill();
}
},
});
test('sse transport', async ({ serverEndpoint }) => {
// need dynamic import b/c of some ESM nonsense
const { SSEClientTransport } = await import('@modelcontextprotocol/sdk/client/sse.js');
const { Client } = await import('@modelcontextprotocol/sdk/client/index.js');
const transport = new SSEClientTransport(new URL(serverEndpoint));
const client = new Client({ name: 'test', version: '1.0.0' });
await client.connect(transport);
await client.ping();
});
test('streamable http transport', async ({ serverEndpoint }) => {
// need dynamic import b/c of some ESM nonsense
const { StreamableHTTPClientTransport } = await import('@modelcontextprotocol/sdk/client/streamableHttp.js');
const { Client } = await import('@modelcontextprotocol/sdk/client/index.js');
const transport = new StreamableHTTPClientTransport(new URL('/mcp', serverEndpoint));
const client = new Client({ name: 'test', version: '1.0.0' });
await client.connect(transport);
await client.ping();
expect(transport.sessionId, 'has session support').toBeDefined();
});