CodeSampleX

Sample

@modelcontextprotocol/sdk 1.30.0: StreamableHTTPServerTransport

Verified sample for npm @modelcontextprotocol/sdk 1.30.0: StreamableHTTPServerTransport. The contract ran on node 22 · linux alpine/x64 · docker and passed.

sha256:b1ff3e0d46f58b358f3fe39f52adc960d0bb0e3fc2b16a3e5575072cce90bb80

This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured. How many distinct signing keys filed a passing contract receipt. One is the author alone; more than one means somebody else built it too. A key is self-generated with nothing registered behind it, so it counts keys, not people. MIT-0

Execution evidence

The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.

Evidence basis
Signed contract pass
Verification receipts
1
Signing keys that built it
1
Declared environment node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10

Verification-run environments

Environment Contract Stages Run
node 22 · linux alpine/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1node:22-alpine@sha256:c610fcdfb1d5…		 2026-08-28

Case

HOW
Goal
verify @modelcontextprotocol/sdk.StreamableHTTPServerTransport in pkg:npm/%40modelcontextprotocol/sdk@1.30.0
Packages
Symbols
  • @modelcontextprotocol/sdk.StreamableHTTPServerTransport
Environment
node 22.23.2
Created
2026-08-28T05:44:40Z

Contract

  1. assert stateless StreamableHTTPServerTransport instantiates with undefined sessionId and emits onclose on close
  2. assert stateless StreamableHTTPServerTransport processes incoming JSON-RPC POST requests and dispatches onmessage
  3. assert StreamableHTTPServerTransport sends JSON-RPC responses over Node.js HTTP server connection with HTTP 200
  4. assert StreamableHTTPServerTransport handleRequest accepts pre-parsed body objects directly bypassing raw body streaming
  5. assert POST requests missing text/event-stream in Accept header reject with HTTP 406 Not Acceptable
  6. assert POST requests with non-JSON Content-Type reject with HTTP 415 Unsupported Media Type
  7. assert unsupported HTTP methods reject with HTTP 405 Method Not Allowed
  8. assert stateful StreamableHTTPServerTransport generates sessionId on initialize request and sets mcp-session-id header
  9. assert stateful StreamableHTTPServerTransport rejects subsequent requests without Mcp-Session-Id header with HTTP 400 Bad Request
  10. assert stateful StreamableHTTPServerTransport rejects requests with mismatched Mcp-Session-Id header with HTTP 404 Not Found
  11. assert stateful StreamableHTTPServerTransport accepts subsequent requests matching session id with HTTP 200
  12. assert DELETE request with valid session id terminates stateful session with HTTP 200
  13. assert GET request for SSE stream requires Accept text/event-stream rejecting with HTTP 406 when missing and returning HTTP 200 with text/event-stream

Files

  • NOTES.md
  • PROMPT.md
  • csx.json
  • package-lock.json
  • package.json
  • spec.json
  • test/contract.mjs

Download the source artifact (tar.gz)

Source

NOTES.md
# Notes

## Prior Sample Found
`search_known_solution` answered with `NO_SAFE_MATCH` for `@modelcontextprotocol/sdk.StreamableHTTPServerTransport`.

## What a Model Would Have Written Instead
A model would often assume `StreamableHTTPServerTransport` can be instantiated once as a global singleton in stateless HTTP server setups, or assume standard JSON HTTP headers like `Accept: application/json` are sufficient for POST requests.

## How the Wrong Version Fails
In stateless mode (`sessionIdGenerator: undefined`), reusing a single `StreamableHTTPServerTransport` instance across multiple requests throws `Stateless transport cannot be reused across requests. Create a new transport per request.`, causing the server to fail with HTTP 500. For POST requests, the MCP transport requires the client to accept both `application/json` and `text/event-stream`, returning HTTP 406 Not Acceptable if `text/event-stream` is missing. Non-JSON payloads return HTTP 415 Unsupported Media Type, and stateful sessions require `Mcp-Session-Id` on subsequent requests (returning HTTP 400 if missing or HTTP 404 if invalid).
PROMPT.md
Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify @modelcontextprotocol/sdk.StreamableHTTPServerTransport in pkg:npm/%40modelcontextprotocol/sdk@1.30.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40modelcontextprotocol/sdk@1.30.0
Demonstrate these symbols/APIs:
  - @modelcontextprotocol/sdk.StreamableHTTPServerTransport
Constraints:
  - executionContext: node
Required runtime conditions:
  - ecosystem: npm
  - language: javascript
  - moduleSystem: cjs
  - packageManager: npm@10.9.8
  - runtime: node@22.23.2

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.
csx.json
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package.json
{
  "name": "sample-streamable-http-server-transport",
  "version": "1.0.0",
  "type": "module",
  "license": "MIT-0",
  "dependencies": {
    "@modelcontextprotocol/sdk": "1.30.0"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify @modelcontextprotocol/sdk.StreamableHTTPServerTransport in pkg:npm/%40modelcontextprotocol/sdk@1.30.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40modelcontextprotocol/sdk@1.30.0"
  ],
  "symbols": [
    "@modelcontextprotocol/sdk.StreamableHTTPServerTransport"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}
test/contract.mjs
import assert from 'node:assert/strict';
import http from 'node:http';
import { StreamableHTTPServerTransport } from '@modelcontextprotocol/sdk/server/streamableHttp.js';

// Helper to run an ephemeral Node HTTP server for the duration of a test block
async function withServer(handler, callback) {
  const server = http.createServer(handler);
  await new Promise((resolve) => server.listen(0, '127.0.0.1', resolve));
  const port = server.address().port;
  const baseUrl = `http://127.0.0.1:${port}/mcp`;
  try {
    await callback(baseUrl);
  } finally {
    server.close();
  }
}

// ---------------------------------------------------------------------------
// 1. Stateless Transport Lifecycle and Properties
// ---------------------------------------------------------------------------
{
  const transport = new StreamableHTTPServerTransport({ sessionIdGenerator: undefined });
  assert.equal(transport.sessionId, undefined);

  let closed = false;
  transport.onclose = () => { closed = true; };

  await transport.start();
  await transport.close();
  assert.equal(closed, true);
}

// ---------------------------------------------------------------------------
// 2. Stateless JSON-RPC Handling over Node HTTP Server
// ---------------------------------------------------------------------------
{
  let receivedMessage = null;

  await withServer((req, res) => {
    // In stateless mode, create a fresh transport per request
    const transport = new StreamableHTTPServerTransport({ sessionIdGenerator: undefined });
    transport.onmessage = async (msg) => {
      receivedMessage = msg;
      await transport.send({ jsonrpc: '2.0', id: msg.id, result: { pong: true } });
    };
    transport.handleRequest(req, res);
  }, async (baseUrl) => {
    const res = await fetch(baseUrl, {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
        'Accept': 'application/json, text/event-stream'
      },
      body: JSON.stringify({ jsonrpc: '2.0', id: 1, method: 'ping' })
    });

    assert.equal(res.status, 200);
    assert.deepEqual(receivedMessage, { jsonrpc: '2.0', id: 1, method: 'ping' });
    const text = await res.text();
    assert.ok(text.includes('{"jsonrpc":"2.0","id":1,"result":{"pong":true}}'));
  });
}

// ---------------------------------------------------------------------------
// 3. Pre-parsed Body Handling (Express body-parser compatibility)
// ---------------------------------------------------------------------------
{
  let receivedMessage = null;

  await withServer((req, res) => {
    const transport = new StreamableHTTPServerTransport({ sessionIdGenerator: undefined });
    transport.onmessage = async (msg) => {
      receivedMessage = msg;
      await transport.send({ jsonrpc: '2.0', id: msg.id, result: { parsed: true } });
    };
    // Supply parsed body directly as 3rd parameter
    const parsedBody = { jsonrpc: '2.0', id: 42, method: 'parsed_method' };
    transport.handleRequest(req, res, parsedBody);
  }, async (baseUrl) => {
    const res = await fetch(baseUrl, {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
        'Accept': 'application/json, text/event-stream'
      },
      body: ''
    });

    assert.equal(res.status, 200);
    assert.deepEqual(receivedMessage, { jsonrpc: '2.0', id: 42, method: 'parsed_method' });
  });
}

// ---------------------------------------------------------------------------
// 4. Request Validation Gates: Accept, Content-Type, and HTTP Method
// ---------------------------------------------------------------------------
{
  await withServer((req, res) => {
    const transport = new StreamableHTTPServerTransport({ sessionIdGenerator: undefined });
    transport.handleRequest(req, res);
  }, async (baseUrl) => {
    // 4a. Accept header missing text/event-stream -> HTTP 406 Not Acceptable
    const noSseRes = await fetch(baseUrl, {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
        'Accept': 'application/json'
      },
      body: JSON.stringify({ jsonrpc: '2.0', id: 1, method: 'ping' })
    });
    assert.equal(noSseRes.status, 406);
    const noSseBody = await noSseRes.json();
    assert.equal(noSseBody.error.code, -32000);
    assert.ok(noSseBody.error.message.includes('Not Acceptable'));

    // 4b. Content-Type not application/json -> HTTP 415 Unsupported Media Type
    const badCtRes = await fetch(baseUrl, {
      method: 'POST',
      headers: {
        'Content-Type': 'text/plain',
        'Accept': 'application/json, text/event-stream'
      },
      body: 'invalid body'
    });
    assert.equal(badCtRes.status, 415);
    const badCtBody = await badCtRes.json();
    assert.equal(badCtBody.error.code, -32000);
    assert.ok(badCtBody.error.message.includes('Unsupported Media Type'));

    // 4c. Unsupported HTTP Method (PUT) -> HTTP 405 Method Not Allowed
    const putRes = await fetch(baseUrl, {
      method: 'PUT',
      headers: {
        'Content-Type': 'application/json',
        'Accept': 'application/json, text/event-stream'
      }
    });
    assert.equal(putRes.status, 405);
    const putBody = await putRes.json();
    assert.equal(putBody.error.code, -32000);
    assert.ok(putBody.error.message.includes('Method not allowed'));
  });
}

// ---------------------------------------------------------------------------
// 5. Stateful Transport: Session Lifecycle, ID Validation, and Termination
// ---------------------------------------------------------------------------
{
  const statefulTransport = new StreamableHTTPServerTransport({
    sessionIdGenerator: () => 'stateful-session-001'
  });

  statefulTransport.onmessage = async (msg) => {
    if (msg.method === 'initialize') {
      await statefulTransport.send({
        jsonrpc: '2.0',
        id: msg.id,
        result: {
          protocolVersion: '2024-11-05',
          capabilities: {},
          serverInfo: { name: 'test-mcp-server', version: '1.0.0' }
        }
      });
    } else if (msg.method === 'tools/list') {
      await statefulTransport.send({
        jsonrpc: '2.0',
        id: msg.id,
        result: { tools: [] }
      });
    }
  };

  await withServer((req, res) => {
    statefulTransport.handleRequest(req, res);
  }, async (baseUrl) => {
    // 5a. Initialization request establishes session ID
    const initRes = await fetch(baseUrl, {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
        'Accept': 'application/json, text/event-stream'
      },
      body: JSON.stringify({
        jsonrpc: '2.0',
        id: 1,
        method: 'initialize',
        params: { protocolVersion: '2024-11-05', capabilities: {}, clientInfo: { name: 'client', version: '1.0' } }
      })
    });
    assert.equal(initRes.status, 200);
    assert.equal(initRes.headers.get('mcp-session-id'), 'stateful-session-001');
    assert.equal(statefulTransport.sessionId, 'stateful-session-001');

    // 5b. Subsequent request missing Mcp-Session-Id header -> HTTP 400 Bad Request
    const noSessionRes = await fetch(baseUrl, {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
        'Accept': 'application/json, text/event-stream'
      },
      body: JSON.stringify({ jsonrpc: '2.0', id: 2, method: 'tools/list' })
    });
    assert.equal(noSessionRes.status, 400);
    const noSessionBody = await noSessionRes.json();
    assert.equal(noSessionBody.error.code, -32000);
    assert.ok(noSessionBody.error.message.includes('Mcp-Session-Id header is required'));

    // 5c. Subsequent request with mismatched Mcp-Session-Id -> HTTP 404 Not Found
    const wrongSessionRes = await fetch(baseUrl, {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
        'Accept': 'application/json, text/event-stream',
        'mcp-session-id': 'unrecognized-session'
      },
      body: JSON.stringify({ jsonrpc: '2.0', id: 3, method: 'tools/list' })
    });
    assert.equal(wrongSessionRes.status, 404);
    const wrongSessionBody = await wrongSessionRes.json();
    assert.equal(wrongSessionBody.error.code, -32001);
    assert.ok(wrongSessionBody.error.message.includes('Session not found'));

    // 5d. Subsequent request with matching Mcp-Session-Id -> HTTP 200 OK
    const validSessionRes = await fetch(baseUrl, {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
        'Accept': 'application/json, text/event-stream',
        'mcp-session-id': 'stateful-session-001'
      },
      body: JSON.stringify({ jsonrpc: '2.0', id: 4, method: 'tools/list' })
    });
    assert.equal(validSessionRes.status, 200);

    // 5e. DELETE request with Mcp-Session-Id terminates session -> HTTP 200 OK
    const deleteRes = await fetch(baseUrl, {
      method: 'DELETE',
      headers: {
        'mcp-session-id': 'stateful-session-001'
      }
    });
    assert.equal(deleteRes.status, 200);
  });

  await statefulTransport.close();
}

// ---------------------------------------------------------------------------
// 6. GET SSE Stream Establishment and Accept Validation
// ---------------------------------------------------------------------------
{
  const statefulTransport = new StreamableHTTPServerTransport({
    sessionIdGenerator: () => 'sse-session-002'
  });

  statefulTransport.onmessage = async (msg) => {
    if (msg.method === 'initialize') {
      await statefulTransport.send({
        jsonrpc: '2.0',
        id: msg.id,
        result: {
          protocolVersion: '2024-11-05',
          capabilities: {},
          serverInfo: { name: 'test', version: '1.0' }
        }
      });
    }
  };

  await withServer((req, res) => {
    statefulTransport.handleRequest(req, res);
  }, async (baseUrl) => {
    // Initialize session first
    await fetch(baseUrl, {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
        'Accept': 'application/json, text/event-stream'
      },
      body: JSON.stringify({
        jsonrpc: '2.0',
        id: 1,
        method: 'initialize',
        params: { protocolVersion: '2024-11-05', capabilities: {}, clientInfo: { name: 'c', version: '1' } }
      })
    });

    // GET without Accept: text/event-stream -> HTTP 406 Not Acceptable
    const noAcceptGet = await fetch(baseUrl, {
      method: 'GET',
      headers: {
        'mcp-session-id': 'sse-session-002'
      }
    });
    assert.equal(noAcceptGet.status, 406);

    // GET with Accept: text/event-stream -> HTTP 200 with text/event-stream
    const abortCtrl = new AbortController();
    const sseRes = await fetch(baseUrl, {
      method: 'GET',
      headers: {
        'mcp-session-id': 'sse-session-002',
        'Accept': 'text/event-stream'
      },
      signal: abortCtrl.signal
    });
    assert.equal(sseRes.status, 200);
    assert.ok(sseRes.headers.get('content-type').includes('text/event-stream'));

    const reader = sseRes.body.getReader();
    const { value } = await reader.read();
    assert.ok(value !== undefined);
    abortCtrl.abort();
  });

  await statefulTransport.close();
}

console.log('contract ok: @modelcontextprotocol/sdk StreamableHTTPServerTransport');

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