{"section":"events","slug":"sse","featureTitle":"SSE Stream","summary":"Real-time server push without WebSockets — connect once and receive real backend events over plain HTTP.","entryLine":"This demo now receives real backend-generated SSE messages over one long-lived HTTP connection, not client-side simulated updates.","highlights":["SseEndpointHandler","AsyncResourceSseServer","EventSource","text/event-stream","SSE_PUBLIC_ANONYMOUS","SSE_MAX_CONN_PER_IP","SSE_MAX_CONN_GLOBAL","SSE_MAX_CONNECTION_AGE_SECONDS"],"learnMoreLabel":"See the SSE handler →","deepDiveLabel":"SSE connection lifecycle →","documentBodyHtml":"
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SSE Stream

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Real-time server push without WebSockets — a persistent HTTP connection that streams events. The client opens one EventSource connection and the server sends named events as they occur.

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How it works

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The SSE endpoint holds an open text/event-stream response. The server pushes named event frames over this connection whenever backend activity produces output. The client JavaScript receives each frame and updates the page without polling or a WebSocket handshake.

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Why this matters

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SSE is simpler than WebSockets for unidirectional server-to-client push: plain HTTP and native browser support via EventSource. Semitexa's SseEndpointHandler integrates with the event dispatcher so that async and queued listener completions can be streamed to the correct session without the client needing to poll.

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Security model

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A long-lived SSE connection holds a Swoole coroutine, a file descriptor, and a response handle for as long as the client stays connected. Unbounded public SSE is a DoS vector — an attacker who can open N connections keeps N workers busy. Semitexa treats SSE as a privileged resource.

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Defaults:

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Opt-in anonymous streams. For public-facing streams (dashboards, ticker widgets, etc.) set SSE_PUBLIC_ANONYMOUS=true. Anonymous requests are then allowed, but the connection caps above still apply unchanged.

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Client contract

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The framework does not replay missed events on reconnect. When a client reconnects after a network drop or after the server hits the age cap, it receives a fresh stream from the server's current state. If your application needs at-least-once delivery semantics, queue events domain-side and re-emit them on reconnect based on the Last-Event-ID header or your own cursor.

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Environment variables

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VariableDefaultPurpose
SSE_PUBLIC_ANONYMOUSfalseAllow unauthenticated clients to open /sse.
SSE_MAX_CONN_PER_IP5Concurrent SSE connections allowed from one IP per worker.
SSE_MAX_CONN_GLOBAL500Concurrent SSE connections allowed per worker.
SSE_MAX_CONNECTION_AGE_SECONDS600Seconds before the server force-closes the stream. 0 disables the cap.
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(rootEl.getAttribute('data-stream-mode') || 'standalone') : 'standalone';\n const SSE_ENDPOINT = rootEl ? (rootEl.getAttribute('data-sse-endpoint') || '/sse') : '/sse';\n const connectBtn = document.getElementById('sse-connect');\n const disconnectBtn = document.getElementById('sse-disconnect');\n const statusEl = document.getElementById('sse-status');\n const logEl = document.getElementById('sse-event-log');\n const logShellEl = logEl ? logEl.closest('.preview-sse-panel__log-shell') : null;\n const minuteSyncEl = document.getElementById('sse-minute-sync');\n const minuteValueEl = document.getElementById('sse-minute-value');\n const minuteSummaryEl = document.getElementById('sse-minute-summary');\n\n if (!statusEl || !logEl || !minuteSyncEl || !minuteValueEl || !minuteSummaryEl) return;\n\n const authRequired = rootEl ? rootEl.getAttribute('data-authorization-required') === 'true' : false;\n const isAuthenticated = rootEl ? rootEl.getAttribute('data-is-authenticated') === 'true' : false;\n const authRequiredMessage = rootEl ? (rootEl.getAttribute('data-auth-required-message') || 'Authorization is required.') : 'Authorization is required.';\n const expectedCadenceSeconds = rootEl ? Math.max(1, parseInt(rootEl.getAttribute('data-expected-cadence-seconds') || '60', 10) || 60) : 60;\n\n let source = null;\n let currentSessionId = '';\n let countdownTimer = null;\n let deferredSummary = 'Shared kiss stream will stay open. The timer tracks the next scheduled heartbeat broadcast from the backend.';\n\n function setDeferredState(summary) {\n deferredSummary = summary;\n minuteSummaryEl.textContent = summary;\n }\n\n function setStatus(text, variant) {\n statusEl.innerHTML = '' + text + '';\n }\n\n function appendEvent(name, data) {\n const placeholder = logEl.querySelector('.preview-sse-panel__placeholder');\n if (placeholder) placeholder.remove();\n\n const item = document.createElement('li');\n item.className = 'preview-sse-panel__event';\n item.innerHTML =\n '' + escHtml(name) + ' ' +\n '' + escHtml(typeof data === 'string' ? data : JSON.stringify(data)) + '' +\n '' + new Date().toLocaleTimeString() + '';\n\n logEl.appendChild(item);\n\n // Keep at most 20 entries\n while (logEl.children.length > 20) {\n logEl.removeChild(logEl.firstChild);\n }\n\n if (logShellEl) {\n logShellEl.scrollTop = logShellEl.scrollHeight;\n }\n }\n\n function parseEventData(raw) {\n if (typeof raw !== 'string') {\n return raw;\n }\n\n try {\n return JSON.parse(raw);\n } catch (_error) {\n return raw;\n }\n }\n\n function formatEventData(data) {\n if (!data || typeof data !== 'object') {\n return typeof data === 'string' ? data : JSON.stringify(data);\n }\n\n const prefix = [];\n if (data.source) prefix.push(data.source);\n if (data.level) prefix.push(data.level);\n\n const title = data.title ? data.title + ': ' : '';\n const message = data.message || JSON.stringify(data);\n\n return (prefix.length ? '[' + prefix.join(' / ') + '] ' : '') + title + message;\n }\n\n function createSessionId() {\n return 'demo_sse_' + Math.random().toString(36).slice(2, 10) + '_' + Date.now().toString(36);\n }\n\n function secondsUntilNextWindow(intervalSeconds) {\n const intervalMs = intervalSeconds * 1000;\n const remainder = Date.now() % intervalMs;\n\n if (remainder === 0) {\n return 0;\n }\n\n return Math.ceil((intervalMs - remainder) / 1000);\n }\n\n function renderCountdown(seconds) {\n minuteValueEl.textContent = String(seconds).padStart(2, '0');\n\n if (source) {\n minuteSummaryEl.textContent = 'The SSE connection is open. The backend will publish the next scheduled event when this counter reaches zero.';\n return;\n }\n\n if (authRequired && !isAuthenticated) {\n minuteSummaryEl.textContent = authRequiredMessage;\n return;\n }\n\n if (streamMode === DEFERRED_KISS_MODE) {\n minuteValueEl.textContent = String(secondsUntilNextWindow(expectedCadenceSeconds)).padStart(2, '0');\n minuteSummaryEl.textContent = deferredSummary;\n return;\n }\n\n minuteSummaryEl.textContent = 'Connect once. The backend will emit a fresh SSE message on every new minute.';\n }\n\n function clearCountdown() {\n if (countdownTimer) {\n window.clearInterval(countdownTimer);\n countdownTimer = null;\n }\n }\n\n function startCountdownLoop() {\n clearCountdown();\n\n const tick = function () {\n renderCountdown(secondsUntilNextWindow(expectedCadenceSeconds));\n };\n\n tick();\n countdownTimer = window.setInterval(tick, 250);\n }\n\n function openStream() {\n currentSessionId = createSessionId();\n source = new EventSource(\n SSE_ENDPOINT\n + '?session_id=' + encodeURIComponent(currentSessionId)\n + '&demo_stream=' + encodeURIComponent(streamMode)\n );\n setStatus('Connecting…', 'warning');\n connectBtn.style.display = 'none';\n disconnectBtn.style.display = '';\n\n source.addEventListener('open', function () {\n setStatus('Connected to backend stream', 'active');\n minuteSummaryEl.textContent = 'Live backend SSE connection is open. A new backend message will arrive on every next minute boundary.';\n });\n\n source.addEventListener('message', function (e) {\n const payload = parseEventData(e.data);\n appendEvent('message', formatEventData(payload));\n });\n\n ['connected', 'resource.updated', 'notification', 'scheduler.tick', 'ping'].forEach(function (eventName) {\n source.addEventListener(eventName, function (e) {\n const payload = parseEventData(e.data);\n appendEvent(eventName, formatEventData(payload));\n if (eventName === 'scheduler.tick') {\n setStatus('Minute tick received', 'success');\n minuteSummaryEl.textContent = 'Fresh backend minute tick received. Countdown restarted for the next minute.';\n }\n });\n });\n\n source.addEventListener('error', function () {\n setStatus('Reconnecting…', 'warning');\n minuteSummaryEl.textContent = 'The connection dropped. EventSource is retrying automatically.';\n });\n }\n\n function initDeferredKissObserver() {\n setStatus('Waiting for deferred stream', 'warning');\n setDeferredState('Waiting for the deferred runtime to open its shared kiss stream and deliver page blocks.');\n\n document.addEventListener('semitexa:deferred:stream', function (e) {\n const detail = e.detail || {};\n const phase = detail.phase || 'update';\n\n if (phase === 'connecting') {\n setStatus('Opening shared kiss stream…', 'warning');\n setDeferredState('The deferred runtime is opening its shared SSE connection. The countdown tracks the next scheduled heartbeat window.');\n appendEvent('kiss.connecting', 'Opening __semitexa_kiss for deferred blocks');\n return;\n }\n\n if (phase === 'connected') {\n setStatus('Shared kiss stream connected', 'active');\n setDeferredState('The deferred runtime is streaming blocks over its shared kiss connection. The countdown tracks the next scheduled heartbeat window.');\n appendEvent('kiss.connected', 'Shared __semitexa_kiss connection established');\n return;\n }\n\n if (phase === 'done') {\n setStatus(detail.live ? 'Deferred stream live' : 'Deferred stream complete', 'success');\n setDeferredState(detail.live\n ? 'Initial deferred delivery finished; the shared kiss connection remains open.'\n : 'Deferred delivery finished and the shared kiss connection closed.');\n appendEvent('kiss.done', detail.live ? 'Initial blocks delivered, live updates remain enabled' : 'Initial deferred delivery completed');\n return;\n }\n\n if (phase === 'error') {\n setStatus('Shared kiss stream interrupted', 'warning');\n setDeferredState('The shared deferred stream dropped; runtime fallback or reconnect logic may take over.');\n appendEvent('kiss.error', 'The shared __semitexa_kiss connection dropped');\n }\n });\n\n document.addEventListener('semitexa:deferred:block', function (e) {\n const detail = e.detail || {};\n if (!detail.slotId) return;\n\n if (detail.mode === 'template') {\n return;\n }\n\n if (detail.mode === 'html') {\n return;\n }\n\n if (detail.mode === 'fallback') {\n return;\n }\n });\n\n document.addEventListener('semitexa:deferred:message', function (e) {\n const detail = e.detail || {};\n const payload = detail.payload || {};\n const eventName = detail.eventName || 'message';\n\n if (eventName === 'scheduler.tick') {\n appendEvent(eventName, formatEventData(payload));\n setStatus('Scheduled heartbeat received', 'success');\n setDeferredState('A real scheduled backend heartbeat arrived over the shared kiss stream. The countdown restarted for the next scheduler window.');\n return;\n }\n });\n\n if (window.SemitexaSSR && window.SemitexaSSR._connected) {\n setStatus('Shared kiss stream connected', 'active');\n setDeferredState('The deferred runtime already has an open shared kiss stream. The countdown tracks the next scheduled heartbeat window.');\n }\n }\n\n function escHtml(str) {\n return String(str)\n .replace(/&/g, '&')\n .replace(//g, '>')\n .replace(/\"/g, '"');\n }\n\n if (streamMode === DEFERRED_KISS_MODE) {\n initDeferredKissObserver();\n } else {\n if (!connectBtn || !disconnectBtn) return;\n\n connectBtn.addEventListener('click', function () {\n if (source || connectBtn.disabled) return;\n\n openStream();\n });\n\n disconnectBtn.addEventListener('click', function () {\n if (source) {\n source.close();\n source = null;\n }\n currentSessionId = '';\n setStatus('Disconnected', 'warning');\n minuteSummaryEl.textContent = 'Connect once. The backend will emit a fresh SSE message on every new minute.';\n connectBtn.style.display = '';\n disconnectBtn.style.display = 'none';\n });\n }\n\n startCountdownLoop();\n }\n\n if (document.readyState === 'loading') {\n document.addEventListener('DOMContentLoaded', init);\n } else {\n init();\n }\n}());\n"},"resultPreviewTemplate":"@project-layouts-semitexa-demo/components/previews/sse-stream.html.twig","resultPreviewData":{"authorizationRequired":true,"isAuthenticated":false,"displayName":null,"email":null,"pictureUrl":null,"hostedDomain":null,"emailVerified":false,"authPageUrl":"/demo/auth/google?return_to=%2Fdemo%2Fevents%2Fsse","startUrl":"/demo/auth/google/start?return_to=%2Fdemo%2Fevents%2Fsse","logoutUrl":"/demo/auth/google/logout?return_to=%2Fdemo%2Fevents%2Fsse","authActionLabel":"Sign in with Google","authSignedInLabel":"Authorized as","sseEndpoint":"/sse","authRequiredMessage":"Authorization is required to open the long-lived SSE stream used by this demo."},"__page_document_html_iri":"/demo/events/sse","__page_document_json_iri":"/demo/events/sse?_format=json","__page_alternates":[{"type":"application/json","href":"/demo/events/sse?_format=json"}]}