server-sequential-thinking/test-streamable-http.html at main · camilovelezr/server-sequential-thinking · GitHub

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<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Streamable HTTP MCP Test Client</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            margin: 20px;
            background-color: #f5f5f5;
        }

        .container {
            max-width: 800px;
            margin: 0 auto;
            background: white;
            padding: 20px;
            border-radius: 8px;
            box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
        }

        h1 {
            color: #333;
        }

        .status {
            padding: 10px;
            margin: 10px 0;
            border-radius: 4px;
        }

        .connected {
            background-color: #d4edda;
            color: #155724;
        }

        .disconnected {
            background-color: #f8d7da;
            color: #721c24;
        }

        .connecting {
            background-color: #fff3cd;
            color: #856404;
        }

        .session-info {
            background-color: #e9ecef;
            padding: 10px;
            margin: 10px 0;
            border-radius: 4px;
            font-family: 'Courier New', monospace;
        }

        .log {
            background-color: #f8f9fa;
            border: 1px solid #dee2e6;
            border-radius: 4px;
            padding: 10px;
            margin: 10px 0;
            max-height: 400px;
            overflow-y: auto;
            font-family: 'Courier New', monospace;
            font-size: 14px;
        }

        .log-entry {
            margin: 5px 0;
            padding: 5px;
            border-bottom: 1px solid #e9ecef;
        }

        .error {
            color: #dc3545;
        }

        .success {
            color: #28a745;
        }

        button {
            background-color: #007bff;
            color: white;
            border: none;
            padding: 10px 20px;
            border-radius: 4px;
            cursor: pointer;
            margin: 5px;
        }

        button:hover {
            background-color: #0056b3;
        }

        button:disabled {
            background-color: #6c757d;
            cursor: not-allowed;
        }
    </style>
</head>

<body>
    <div class="container">
        <h1>Streamable HTTP MCP Test Client</h1>

        <div id="status" class="status disconnected">
            Status: <span id="statusText">Disconnected</span>
        </div>

        <div id="sessionInfo" class="session-info" style="display: none;">
            Session ID: <span id="sessionId">None</span>
        </div>

        <div>
            <button id="connectBtn">Initialize Session</button>
            <button id="streamBtn" disabled>Start Stream</button>
            <button id="testToolsBtn" disabled>Test Tools</button>
            <button id="disconnectBtn" disabled>Disconnect</button>
            <button id="clearBtn">Clear Log</button>
        </div>

        <h2>Activity Log</h2>
        <div id="log" class="log"></div>
    </div>

    <script type="module">
        let sessionId = null;
        let eventSource = null;

        const statusEl = document.getElementById('status');
        const statusTextEl = document.getElementById('statusText');
        const sessionInfoEl = document.getElementById('sessionInfo');
        const sessionIdEl = document.getElementById('sessionId');
        const logEl = document.getElementById('log');
        const connectBtn = document.getElementById('connectBtn');
        const streamBtn = document.getElementById('streamBtn');
        const testToolsBtn = document.getElementById('testToolsBtn');
        const disconnectBtn = document.getElementById('disconnectBtn');
        const clearBtn = document.getElementById('clearBtn');

        function log(message, type = 'info') {
            const entry = document.createElement('div');
            entry.className = `log-entry ${type}`;
            const timestamp = new Date().toLocaleTimeString();
            entry.textContent = `[${timestamp}] ${message}`;
            logEl.appendChild(entry);
            logEl.scrollTop = logEl.scrollHeight;
        }

        function setStatus(status, text) {
            statusEl.className = `status ${status}`;
            statusTextEl.textContent = text;
        }

        function updateSessionInfo(newSessionId) {
            sessionId = newSessionId;
            if (sessionId) {
                sessionIdEl.textContent = sessionId;
                sessionInfoEl.style.display = 'block';
            } else {
                sessionInfoEl.style.display = 'none';
            }
        }

        async function sendMessage(message, includeSession = true) {
            try {
                const headers = {
                    'Content-Type': 'application/json',
                    'Accept': 'application/json, text/event-stream'
                };

                if (includeSession && sessionId) {
                    headers['mcp-session-id'] = sessionId;
                }

                const response = await fetch('http://127.0.0.1:3000/mcp', {
                    method: 'POST',
                    headers: headers,
                    body: JSON.stringify(message)
                });

                // Check if we got a new session ID
                const newSessionId = response.headers.get('mcp-session-id');
                if (newSessionId && newSessionId !== sessionId) {
                    updateSessionInfo(newSessionId);
                    log(`New session ID: ${newSessionId}`, 'success');
                }

                if (!response.ok) {
                    const errorText = await response.text();
                    throw new Error(`HTTP error! status: ${response.status}, body: ${errorText}`);
                }

                // Check content type to determine how to handle the response
                const contentType = response.headers.get('content-type');

                if (contentType && contentType.includes('text/event-stream')) {
                    // Handle SSE response
                    log('Received SSE stream response', 'info');
                    const reader = response.body.getReader();
                    const decoder = new TextDecoder();
                    let buffer = '';

                    while (true) {
                        const { done, value } = await reader.read();
                        if (done) break;

                        buffer += decoder.decode(value, { stream: true });
                        const lines = buffer.split('\n');
                        buffer = lines.pop() || '';

                        for (const line of lines) {
                            if (line.startsWith('data: ')) {
                                const data = line.slice(6);
                                if (data) {
                                    try {
                                        const parsed = JSON.parse(data);
                                        log(`SSE data: ${JSON.stringify(parsed, null, 2)}`, 'success');
                                        return parsed; // Return first JSON-RPC response
                                    } catch (e) {
                                        log(`SSE data: ${data}`);
                                    }
                                }
                            }
                        }
                    }
                } else {
                    // Handle regular JSON response
                    const result = await response.json();
                    log(`Response: ${JSON.stringify(result, null, 2)}`, 'success');
                    return result;
                }
            } catch (error) {
                log(`Error sending message: ${error.message}`, 'error');
                return null;
            }
        }

        async function initialize() {
            log('Sending initialize request...');
            const message = {
                jsonrpc: '2.0',
                id: 1,
                method: 'initialize',
                params: {
                    protocolVersion: '2024-11-05',
                    capabilities: {},
                    clientInfo: {
                        name: 'browser-test-client',
                        version: '1.0.0'
                    }
                }
            };

            const result = await sendMessage(message, false); // Don't include session for initialization
            if (result) {
                connectBtn.disabled = true;
                streamBtn.disabled = false;
                testToolsBtn.disabled = false;
                disconnectBtn.disabled = false;
                setStatus('connected', 'Connected');
            }
        }

        async function startStream() {
            if (!sessionId) {
                log('No session ID available', 'error');
                return;
            }

            log('Starting SSE stream...');

            // EventSource doesn't support custom headers, so we use query parameter
            eventSource = new EventSource(`http://127.0.0.1:3000/mcp?sessionId=${sessionId}`);

            eventSource.onopen = (event) => {
                log('SSE stream opened', 'success');
                streamBtn.textContent = 'Stop Stream';
            };

            eventSource.onmessage = (event) => {
                log(`Stream message: ${event.data}`);
                try {
                    const data = JSON.parse(event.data);
                    log(`Parsed: ${JSON.stringify(data, null, 2)}`);
                } catch (e) {
                    // Not JSON, just log as is
                }
            };

            eventSource.onerror = (event) => {
                log('SSE stream error', 'error');
                if (eventSource.readyState === EventSource.CLOSED) {
                    log('SSE stream closed');
                    streamBtn.textContent = 'Start Stream';
                }
            };
        }

        async function listTools() {
            log('Requesting tool list...');
            const message = {
                jsonrpc: '2.0',
                id: 2,
                method: 'tools/list',
                params: {}
            };

            await sendMessage(message);
        }

        async function testSequentialThinking() {
            log('Testing sequential thinking tool...');

            // First thought
            await sendMessage({
                jsonrpc: '2.0',
                id: 3,
                method: 'tools/call',
                params: {
                    name: 'sequentialthinking',
                    arguments: {
                        thought: 'Testing Streamable HTTP transport from browser',
                        nextThoughtNeeded: true,
                        thoughtNumber: 1,
                        totalThoughts: 3
                    }
                }
            });

            // Second thought
            await sendMessage({
                jsonrpc: '2.0',
                id: 4,
                method: 'tools/call',
                params: {
                    name: 'sequentialthinking',
                    arguments: {
                        thought: 'The Streamable HTTP connection is working well',
                        nextThoughtNeeded: true,
                        thoughtNumber: 2,
                        totalThoughts: 3
                    }
                }
            });

            // Final thought
            await sendMessage({
                jsonrpc: '2.0',
                id: 5,
                method: 'tools/call',
                params: {
                    name: 'sequentialthinking',
                    arguments: {
                        thought: 'Successfully tested the new transport protocol',
                        nextThoughtNeeded: false,
                        thoughtNumber: 3,
                        totalThoughts: 3
                    }
                }
            });
        }

        async function disconnect() {
            if (eventSource) {
                eventSource.close();
                eventSource = null;
                streamBtn.textContent = 'Start Stream';
            }

            if (sessionId) {
                log('Sending disconnect request...');
                try {
                    const response = await fetch('http://127.0.0.1:3000/mcp', {
                        method: 'DELETE',
                        headers: {
                            'mcp-session-id': sessionId
                        }
                    });

                    if (response.ok) {
                        log('Disconnected successfully', 'success');
                    }
                } catch (error) {
                    log(`Error disconnecting: ${error.message}`, 'error');
                }
            }

            updateSessionInfo(null);
            connectBtn.disabled = false;
            streamBtn.disabled = true;
            testToolsBtn.disabled = true;
            disconnectBtn.disabled = true;
            setStatus('disconnected', 'Disconnected');
        }

        connectBtn.addEventListener('click', initialize);

        streamBtn.addEventListener('click', () => {
            if (eventSource && eventSource.readyState !== EventSource.CLOSED) {
                eventSource.close();
                eventSource = null;
                streamBtn.textContent = 'Start Stream';
                log('SSE stream stopped');
            } else {
                startStream();
            }
        });

        testToolsBtn.addEventListener('click', async () => {
            testToolsBtn.disabled = true;

            await listTools();
            await new Promise(resolve => setTimeout(resolve, 1000));
            await testSequentialThinking();

            testToolsBtn.disabled = false;
        });

        disconnectBtn.addEventListener('click', disconnect);

        clearBtn.addEventListener('click', () => {
            logEl.innerHTML = '';
            log('Log cleared');
        });

        // Initial log
        log('Streamable HTTP MCP Test Client ready');
        log('This client uses the new Streamable HTTP transport protocol');
    </script>
</body>

</html>