49 lines
1.9 KiB
TypeScript
49 lines
1.9 KiB
TypeScript
/**
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* Asserts the `responseMode: 'json'` server answers a `tools/call` with a
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* `Content-Type: application/json` body (not `text/event-stream`) AND that the
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* regular `Client` works against it unchanged.
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*
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* HTTP-only, modern-only — `responseMode` shapes the 2026-07-28 per-request
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* HTTP path; there is no stdio equivalent and 2025-era traffic goes through
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* the stateless legacy fallback unaffected.
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*/
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import { check, parseExampleArgs } from '@mcp-examples/shared';
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import { Client, isJsonContentType, StreamableHTTPClientTransport } from '@modelcontextprotocol/client';
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const { url } = parseExampleArgs();
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const client = new Client({ name: 'json-response-example-client', version: '1.0.0' }, { versionNegotiation: { mode: 'auto' } });
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await client.connect(new StreamableHTTPClientTransport(new URL(url)));
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// Low-level: a 2026-07-28 (envelope) request should come back as plain JSON —
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// the JSON content-type assertion is the point of the story.
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const probe = await fetch(url, {
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method: 'POST',
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headers: {
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'content-type': 'application/json',
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accept: 'application/json, text/event-stream',
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'mcp-protocol-version': '2026-07-28',
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'mcp-method': 'tools/list'
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},
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body: JSON.stringify({
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jsonrpc: '2.0',
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id: 1,
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method: 'tools/list',
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params: {
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_meta: {
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'io.modelcontextprotocol/protocolVersion': '2026-07-28',
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'io.modelcontextprotocol/clientInfo': { name: 'probe', version: '1.0.0' },
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'io.modelcontextprotocol/clientCapabilities': {}
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}
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}
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})
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});
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check.equal(isJsonContentType(probe.headers.get('content-type')), true);
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check.equal(probe.status, 200);
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// High-level: the regular Client works unchanged.
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const result = await client.callTool({ name: 'greet', arguments: { name: 'json' } });
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check.equal(result.content?.[0]?.type === 'text' ? result.content[0].text : '', 'Hello, json!');
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await client.close();
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