[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"site-config":3,"topic:html-server-sent-events-sse":6,"blog-categories":85,"course-tree":111},{"data":4},{"google_site_verification":5,"ga4_measurement_id":5,"site_name":5,"default_og_image":5,"twitter_handle":5},null,{"data":7},{"id":8,"title":9,"slug":10,"content":11,"course":12,"subcategory":15,"author":18,"reading_time_minutes":24,"cornerstone":25,"schema_type":26,"faq_json":5,"video_url":5,"canonical_url":27,"meta_title":28,"meta_description":29,"og_image":5,"toc_json":30,"code_examples":58,"quiz":5,"exercises":67,"published_at":5,"updated_at":76,"prev":77,"next":81},66,"HTML Server-Sent Events (SSE)","html-server-sent-events-sse","\u003Ch2 id=\"html-server-sent-events-sse\">HTML Server-Sent Events (SSE)\u003C\u002Fh2>\u003Cp>Server-Sent Events let a server push a continuous stream of updates to a web page over a single, long-lived HTTP connection — without the browser needing to repeatedly poll or ask for new data. It's a simpler, one-way alternative to WebSockets, ideal whenever data only needs to flow from server to client.\u003C\u002Fp>\u003Ch3 id=\"how-sse-differs-from-websockets\">How SSE Differs from WebSockets\u003C\u002Fh3>\u003Cul>\n\u003Cli>\u003Cstrong>SSE\u003C\u002Fstrong> — one-way only (server → client), built on plain HTTP, automatically reconnects, and text-based (UTF-8) only.\u003C\u002Fli>\n\u003Cli>\u003Cstrong>WebSockets\u003C\u002Fstrong> — two-way (client <-> server), needs its own protocol upgrade, and supports both text and binary data.\u003C\u002Fli>\n\u003C\u002Ful>\u003Cp>If your app only needs to receive live updates (stock tickers, notifications, live scores, progress bars) rather than send data back over the same channel, SSE is usually the simpler and lighter option.\u003C\u002Fp>\u003Ch3 id=\"the-eventsource-interface\">The EventSource Interface\u003C\u002Fh3>\u003Cp>On the client side, SSE is consumed through the built-in \u003Ccode>EventSource\u003C\u002Fcode> object. Creating one and pointing it at a server endpoint automatically opens a persistent connection and starts listening for incoming messages.\u003C\u002Fp>\u003Ch3 id=\"the-server-side\">The Server Side\u003C\u002Fh3>\u003Cp>The server must respond with the \u003Ccode>Content-Type: text\u002Fevent-stream\u003C\u002Fcode> header and keep the connection open, sending each update as a block of text starting with \u003Ccode>data: \u003C\u002Fcode> and ending with two newlines.\u003C\u002Fp>\u003Ch3 id=\"handling-events\">Handling Events\u003C\u002Fh3>\u003Cp>The default \u003Ccode>message\u003C\u002Fcode> event fires for standard updates, but a server can also send named custom events, which the client listens for using \u003Ccode>addEventListener('eventName', ...)\u003C\u002Fcode> instead of the generic \u003Ccode>onmessage\u003C\u002Fcode>.\u003C\u002Fp>\u003Ch3 id=\"automatic-reconnection\">Automatic Reconnection\u003C\u002Fh3>\u003Cp>One of SSE's biggest advantages is that the browser automatically attempts to reconnect if the connection drops, without any extra code needed — the server can also send a numeric \u003Ccode>id:\u003C\u002Fcode> field with each event so the browser can tell the server where to resume from after reconnecting.\u003C\u002Fp>\u003Ch3 id=\"common-use-cases\">Common Use Cases\u003C\u002Fh3>\u003Cp>Live notifications, stock or crypto price tickers, sports score updates, live dashboards, and progress indicators for long-running server tasks are all classic Server-Sent Events use cases.\u003C\u002Fp>\u003Cdiv class=\"try-it-yourself language-javascript\">\u003Cpre>\u003Ccode>\u002F\u002F Client-side: connecting to an SSE stream\nconst source = new EventSource('\u002Fevents');\n\nsource.onmessage = (event) => {\n  console.log('New update:', event.data);\n};\n\nsource.addEventListener('priceUpdate', (event) => {\n  const data = JSON.parse(event.data);\n  console.log('Price updated:', data.symbol, data.price);\n});\n\nsource.onerror = (err) => {\n  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