Http学习相关

语言 ： TypeScript | 原生 ： fetch, ReadableStream

代表项目

• minecraft-dev - 对接DeepSeek Chat Completions，同时支持普通请求与SSE流式响应

实现历程

核心实现

 通过fetch发起POST请求，Authorization: Bearer携带API Key；开启stream:true后响应体是SSE格式的ReadableStream，逐块读取并按行解析data:前缀，取出choices[0].delta.content拼接完整回复。

const resp = await fetch("https://api.deepseek.com/v1/chat/completions", {
    method: "POST",
    headers: { "Content-Type": "application/json", Authorization: `Bearer ${key}` },
    body: JSON.stringify({
        model: "deepseek-chat",
        stream: true,
        messages: [{ role: "system", content: system }, { role: "user", content: user }],
    }),
});

// 流式读取：逐chunk解码 → 按\n切行 → 取 data: 后的JSON → 拼接delta
const reader = resp.body!.getReader();
const decoder = new TextDecoder();
while (true) {
    const { done, value } = await reader.read();
    if (done) break;
    for (const line of decoder.decode(value, { stream: true }).split("\n")) {
        if (!line.startsWith("data:")) continue;
        const chunk = JSON.parse(line.slice(5).trim());
        full += chunk.choices?.[0]?.delta?.content ?? "";
    }
}