Created
March 20, 2023 18:54
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golang SSE example generated GPT4
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| package main | |
| /* | |
| This was entirely generated by GPT4 with the prompt: | |
| write me a simple golang server demonstrating server sent events (sse) | |
| */ | |
| import ( | |
| "fmt" | |
| "net/http" | |
| "time" | |
| ) | |
| func main() { | |
| http.HandleFunc("/", serveHome) | |
| http.HandleFunc("/sse", serveSSE) | |
| http.ListenAndServe(":8080", nil) | |
| } | |
| func serveHome(w http.ResponseWriter, r *http.Request) { | |
| html := `<!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <meta http-equiv="X-UA-Compatible" content="IE=edge"> | |
| <meta name="viewport" content="width=device-width, initial-scale=1.0"> | |
| <title>Server-Sent Events Demo</title> | |
| </head> | |
| <body> | |
| <h1>Server-Sent Events Demo</h1> | |
| <div id="events"></div> | |
| <script> | |
| const eventSource = new EventSource("/sse"); | |
| eventSource.onmessage = (event) => { | |
| const eventsDiv = document.getElementById("events"); | |
| eventsDiv.innerHTML += "<p>" + event.data + "</p>"; | |
| }; | |
| eventSource.onerror = () => { | |
| console.error("Error occurred in EventSource connection."); | |
| }; | |
| </script> | |
| </body> | |
| </html>` | |
| w.Header().Set("Content-Type", "text/html") | |
| w.Write([]byte(html)) | |
| } | |
| func serveSSE(w http.ResponseWriter, r *http.Request) { | |
| w.Header().Set("Content-Type", "text/event-stream") | |
| w.Header().Set("Cache-Control", "no-cache") | |
| w.Header().Set("Connection", "keep-alive") | |
| flusher, ok := w.(http.Flusher) | |
| if !ok { | |
| http.Error(w, "Streaming unsupported!", http.StatusInternalServerError) | |
| return | |
| } | |
| for i := 1; ; i++ { | |
| fmt.Fprintf(w, "data: Message %d from server\n\n", i) | |
| flusher.Flush() | |
| time.Sleep(time.Second) | |
| } | |
| } |
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