Server-Sent Events (SSE) Example

Demonstrates SSE event formatting and streaming from server to client. Uses httpx.sse.Event for W3C-compliant SSE wire format and Context.sse() for server-side SSE responses.

Demo Program

// Format an SSE event (W3C wire format)
const event = httpx.sse.Event{
    .event = "message",
    .id = "1",
    .data = "Hello, World!",
};
const formatted = try event.format(allocator);

// Server handler returning SSE response
fn sseHandler(ctx: *httpx.Context) anyerror!httpx.Response {
    const events = [_]httpx.SseEvent{
        .{ .event = "message", .id = "1", .data = "Hello, SSE!" },
        .{ .event = "update", .id = "2", .data = "Second event" },
    };
    return ctx.sse(&events);
}

Run

zig build example-sse-example

Checklist

• [x] SSE events are formatted in W3C wire format (event:, id:, data:)
• [x] Multi-line data is split correctly
• [x] Retry events include retry: field
• [x] Server returns proper Content-Type: text/event-stream
• [x] Client receives all events in order