跳轉到主要內容

​
總覽

串流允許您在回應生成時即時接收部分內容，為聊天應用程式提供更好的使用者體驗。

​
啟用串流

在您的請求中設定 stream: true： 
curl https://api.lemondata.cc/v1/chat/completions \
  -H "Authorization: Bearer sk-your-api-key" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-4o",
    "messages": [{"role": "user", "content": "Write a short poem"}],
    "stream": true
  }'

​
串流回應格式

串流中的每個區塊 (chunk) 都遵循以下格式： 
data: {"id":"chatcmpl-xxx","object":"chat.completion.chunk","created":1234567890,"model":"gpt-4o","choices":[{"index":0,"delta":{"content":"Hello"},"finish_reason":null}]}

data: {"id":"chatcmpl-xxx","object":"chat.completion.chunk","created":1234567890,"model":"gpt-4o","choices":[{"index":0,"delta":{"content":" world"},"finish_reason":null}]}

data: {"id":"chatcmpl-xxx","object":"chat.completion.chunk","created":1234567890,"model":"gpt-4o","choices":[{"index":0,"delta":{},"finish_reason":"stop"}]}

data: [DONE]

​
處理串流結束

串流結束於：
  • finish_reason: "stop" - 正常完成
  • finish_reason: "length" - 達到 max_tokens 限制
  • finish_reason: "tool_calls" - 模型想要呼叫工具
  • data: [DONE] - 最後一則訊息

​
收集完整回應

要在串流時收集完整的回應： 
full_response = ""

for chunk in stream:
    if chunk.choices[0].delta.content:
        content = chunk.choices[0].delta.content
        full_response += content
        print(content, end="", flush=True)

print(f"\n\nFull response: {full_response}")

​
非同步串流 (Async Streaming)

對於非同步應用程式： 
import asyncio
from openai import AsyncOpenAI

async def main():
    client = AsyncOpenAI(
        api_key="sk-your-api-key",
        base_url="https://api.lemondata.cc/v1"
    )

    stream = await client.chat.completions.create(
        model="gpt-4o",
        messages=[{"role": "user", "content": "Hello!"}],
        stream=True
    )

    async for chunk in stream:
        if chunk.choices[0].delta.content:
            print(chunk.choices[0].delta.content, end="")

asyncio.run(main())

​
網頁應用程式範例

對於網頁聊天介面： 
async function streamChat(message) {
  const response = await fetch('https://api.lemondata.cc/v1/chat/completions', {
    method: 'POST',
    headers: {
      'Authorization': 'Bearer sk-your-api-key',
      'Content-Type': 'application/json'
    },
    body: JSON.stringify({
      model: 'gpt-4o',
      messages: [{ role: 'user', content: message }],
      stream: true
    })
  });

  const reader = response.body.getReader();
  const decoder = new TextDecoder();

  while (true) {
    const { done, value } = await reader.read();
    if (done) break;

    const chunk = decoder.decode(value);
    const lines = chunk.split('\n').filter(line => line.startsWith('data: '));

    for (const line of lines) {
      const data = line.slice(6);
      if (data === '[DONE]') return;

      const parsed = JSON.parse(data);
      const content = parsed.choices[0]?.delta?.content;
      if (content) {
        // Append to your UI
        document.getElementById('output').textContent += content;
      }
    }
  }
}