实时歌词推送

Server-Sent Events 实时歌词推送。

连接建立时： 始终立即发送一条当前歌词状态（有歌词时发送歌词数据，无歌词时发送 "data":{}）。

初始发送（无歌词时）：

data: {"type":"lyric_update","player":"wesing","data":{}}

初始发送（有歌词时）：

data: {"type":"lyric_update","player":"wesing","data":{"line_index":5,"text":"君に嘘をついていた","sub_text":"","timestamp":9.0,"play_time":9.15,"progress":0.5}}

播放过程中，每当歌词更新时接收：

data: {"type":"lyric_update","player":"wesing","data":{"line_index":3,"text":"手を伸ばしても届かない","sub_text":"","timestamp":3.8,"play_time":3.85,"progress":0.25}}

完整生命周期示例：

（连接建立，当前无歌词）
data: {"type":"lyric_update","player":"wesing","data":{}}

（用户开始播放歌曲）
data: {"type":"lyric_update","player":"wesing","data":{"line_index":0,"text":"男：摘一颗苹果","sub_text":"","timestamp":18.326,"play_time":18.15,"progress":0.05}}
data: {"type":"lyric_update","player":"wesing","data":{"line_index":1,"text":"男：等你从门前经过","sub_text":"","timestamp":20.198,"play_time":20.05,"progress":0.1}}

（切歌 — 服务端不发送清空消息，前端自行根据新歌数据重置显示）
data: {"type":"lyric_update","player":"wesing","data":{"line_index":0,"text":"新歌第一行歌词","sub_text":"","timestamp":15.0,"play_time":15.1,"progress":0.04}}

特性：

完全支持 UTF-8 编码（中文、日文、韩文、俄文等所有语言）

服务器设置了 Content-Type: text/event-stream; charset=utf-8

连接时始终立即发送当前状态

实时推送，延迟极低

支持跨域（CORS）

客户端使用示例（JavaScript）：

text/event-stream

SSE 事件流

Body

示例

有歌词时无歌词时

data: {"type":"lyric_update","player":"wesing","data":{"line_index":5,"text":"君に嘘をついていた","sub_text":"","timestamp":9.0,"play_time":9.15,"progress":0.5}}

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