\u5982\u679c\u4f60\u7528\u8fc7\u5b98\u65b9\u5bf9\u8bdd\u9875\u9762，\u4e00\u5b9a\u89c1\u8fc7\u90a3\u79cd\u300c\u4e00\u4e2a\u5b57\u4e00\u4e2a\u5b57\u5f80\u5916\u8e66\u300d\u7684\u6253\u5b57\u673a\u6548\u679c\u3002\u5b83\u4e0d\u53ea\u662f\u597d\u770b\u2014\u2014\u9996 token \u5ef6\u8fdf\u88ab\u644a\u8584\u5230\u6bcf\u4e00\u4e2a\u5b57\u4e0a，\u7528\u6237\u611f\u77e5\u5230\u7684\u54cd\u5e94\u901f\u5ea6\u4f1a\u660e\u663e\u53d8\u5feb，\u4e5f\u66f4\u5bb9\u6613\u5728\u957f\u56de\u7b54\u65f6\u4e0d\u81f3\u4e8e\u76ef\u7740\u4e00\u7247\u7a7a\u767d\u53d1\u5446\u3002\u4f46\u5f53\u4f60\u628a\u6a21\u578b\u63a5\u5230\u81ea\u5df1\u7684\u4e1a\u52a1\u540e\u7aef，\u9ed8\u8ba4\u62ff\u5230\u7684\u5f80\u5f80\u662f\u4e00\u6574\u6bb5\u6587\u672c\u6324\u5728\u6700\u540e\u4e00\u6b21\u54cd\u5e94\u91cc\u3002\u672c\u6587\u7528 FastAPI + Server-Sent Events（SSE），\u624b\u628a\u624b\u5b9e\u73b0\u4e00\u4e2a\u53ef\u72ec\u7acb\u8fd0\u884c\u7684\u6d41\u5f0f\u8f93\u51fa\u63a5\u53e3，\u5e76\u914d\u4e0a\u4e00\u4e2a\u80fd\u8dd1\u7684\u6781\u7b80\u524d\u7aef，\u6240\u6709\u4ee3\u7801\u76f4\u63a5\u590d\u5236\u5373\u53ef\u7528\u3002<\/p>\n
\u6d41\u5f0f\u63a8\u9001\u6709\u4e24\u4e2a\u5e38\u89c1\u65b9\u6848：WebSocket \u548c SSE\u3002WebSocket \u662f\u53cc\u5411\u5168\u53cc\u5de5\u901a\u9053，\u9002\u5408\u6e38\u620f\u3001\u804a\u5929\u5ba4\u8fd9\u79cd\u4e24\u7aef\u9ad8\u9891\u4e92\u53d1\u7684\u573a\u666f；\u800c\u5927\u6a21\u578b\u56de\u7b54\u662f\u300c\u670d\u52a1\u7aef\u5355\u5411\u6301\u7eed\u63a8\u9001\u3001\u5ba2\u6237\u7aef\u57fa\u672c\u53ea\u6536\u4e0d\u53d1\u300d，SSE \u521a\u597d\u5339\u914d\u2014\u2014\u5b83\u57fa\u4e8e\u666e\u901a HTTP，\u6d4f\u89c8\u5668\u539f\u751f EventSource \u5373\u53ef\u63a5\u6536，\u4e0d\u9700\u8981\u989d\u5916\u63e1\u624b\u5e93，nginx \u4e5f\u80fd\u76f4\u63a5\u900f\u4f20\u3002\u5bf9\u5927\u591a\u6570 AI \u5e94\u7528\u6765\u8bf4，SSE \u662f\u66f4\u8f7b\u7684\u9009\u62e9\u3002<\/p>\n
\u6838\u5fc3\u601d\u8def\u662f\u8ba9\u63a5\u53e3\u8fd4\u56de\u4e00\u4e2a StreamingResponse，\u5185\u5bb9\u7c7b\u578b\u4e3a text\/event-stream，\u5185\u90e8\u7528\u751f\u6210\u5668\u9010\u6bb5 yield\u3002\u4e0b\u9762\u8fd9\u6bb5\u4ee3\u7801\u5bf9\u63a5 OpenAI \u517c\u5bb9\u63a5\u53e3，\u628a\u6a21\u578b\u8fd4\u56de\u7684\u589e\u91cf token \u5305\u6210 SSE \u683c\u5f0f\u63a8\u7ed9\u524d\u7aef：<\/p>\n
from fastapi import FastAPI
\nfrom fastapi.responses import StreamingResponse
\nimport httpx, os, json<\/p>\n
app = FastAPI()
\nAPI_KEY = os.getenv("OPENAI_API_KEY")
\nBASE_URL = "https:\/\/api.openai.com\/v1"<\/p>\n
def event_generator(prompt: str):
\n payload = {
\n "model": "gpt-4o-mini",
\n "messages": [{"role": "user", "content": prompt}],
\n "stream": True,
\n }
\n with httpx.Client(timeout=60) as client:
\n with client.stream("POST", f"{BASE_URL}\/chat\/completions",
\n headers={"Authorization": f"Bearer {API_KEY}"},
\n json=payload) as r:
\n for line in r.iter_lines():
\n if not line or not line.startswith("data:"):
\n continue
\n data = line[len("data:"):].strip()
\n if data == "[DONE]":
\n yield "data: [DONE]\\\\n\\\\n"
\n break
\n delta = json.loads(data)["choices"][0]["delta"].get("content", "")
\n if delta:
\n yield f"data: {delta}\\\\n\\\\n"<\/p>\n
@app.get("\/chat\/stream")
\ndef chat_stream(q: str):
\n return StreamingResponse(event_generator(q),
\n media_type="text\/event-stream",
\n headers={"Cache-Control": "no-cache",
\n "X-Accel-Buffering": "no"})<\/p>\n
\u5173\u952e\u70b9\u53ea\u6709\u4e09\u4e2a：stream=True \u8ba9\u4e0a\u6e38\u589e\u91cf\u8fd4\u56de；iter_lines \u9010\u884c\u8bfb SSE \u5206\u7247；X-Accel-Buffering: no \u662f\u7ed9 nginx \u7684\u53cd\u5411\u4ee3\u7406\u5173\u7f13\u51b2\u7528\u7684，\u6f0f\u4e86\u5b83\u524d\u7aef\u4f1a\u7b49\u5168\u90e8\u7ed3\u675f\u624d\u4e00\u6b21\u6027\u6536\u5230\u3002<\/p>\n
\u524d\u7aef\u7528\u6d4f\u89c8\u5668\u539f\u751f EventSource \u5373\u53ef，\u4e0d\u9700\u8981\u4efb\u4f55\u4f9d\u8d56：<\/p>\n
<div id="box"><\/div>
\n<script>
\nconst es = new EventSource("\/chat\/stream?q=" + encodeURIComponent("\u7528\u4e00\u53e5\u8bdd\u89e3\u91ca\u4ec0\u4e48\u662f SSE"));
\nes.onmessage = (e) => {
\n if (e.data === "[DONE]") { es.close(); return; }
\n document.getElementById("box").innerText += e.data;
\n};
\n<\/script><\/p>\n
innerText += \u5c31\u662f\u6253\u5b57\u673a\u6548\u679c\u672c\u8eab\u2014\u2014\u6bcf\u6536\u5230\u4e00\u6bb5\u5c31\u8ffd\u52a0\u5230\u9875\u9762\u3002<\/p>\n
\u6d41\u5f0f\u8f93\u51fa\u4e0d\u662f\u70ab\u6280，\u5b83\u662f\u6539\u5584\u5927\u6a21\u578b\u4ea7\u54c1\u4f53\u611f\u7684\u6700\u4f4e\u6210\u672c\u6539\u52a8\u4e4b\u4e00\u3002FastAPI \u7684 StreamingResponse \u914d\u5408 SSE，\u51e0\u5341\u884c\u5c31\u80fd\u628a\u300c\u6324\u7259\u818f\u300d\u53d8\u6210\u300c\u6253\u5b57\u673a\u300d\u3002\u5148\u628a\u6700\u5c0f\u95ed\u73af\u8dd1\u901a，\u518d\u8865\u8d85\u65f6\u3001\u80cc\u538b\u3001\u9274\u6743\u4e09\u4ef6\u5957，\u4f60\u7684\u63a5\u53e3\u5c31\u80fd\u7a33\u7a33\u5730\u300c\u8fb9\u60f3\u8fb9\u8bf4\u300d\u4e86\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u7528 FastAPI SSE \u628a\u5927\u6a21\u578b\u7684\u300c\u6253\u5b57\u673a\u300d\u6548\u679c\u642c\u8fdb\u4f60\u81ea\u5df1\u7684\u540e\u7aef：\u5b8c\u6574\u53ef\u8fd0\u884c\u5b9e\u6218
\n\u5f15\u8a00
\n\u5982\u679c\u4f60\u7528\u8fc7\u5b98\u65b9\u5bf9\u8bdd\u9875\u9762，\u4e00\u5b9a\u89c1\u8fc7\u90a3\u79cd\u300c\u4e00\u4e2a\u5b57\u4e00\u4e2a\u5b57\u5f80\u5916\u8e66\u300d\u7684\u6253\u5b57\u673a\u6548\u679c\u3002\u5b83\u4e0d\u53ea\u662f\u597d\u770b\u2014\u2014\u9996 token \u5ef6\u8fdf\u88ab\u644a\u8584\u5230\u6bcf\u4e00\u4e2a\u5b57\u4e0a，\u7528\u6237\u611f\u77e5\u5230\u7684\u54cd\u5e94\u901f\u5ea6\u4f1a\u660e\u663e\u53d8\u5feb，\u4e5f\u66f4\u5bb9\u6613\u5728\u957f\u56de\u7b54\u65f6\u4e0d\u81f3\u4e8e\u76ef\u7740\u4e00\u7247\u7a7a\u767d\u53d1\u5446\u3002\u4f46\u5f53\u4f60\u628a\u6a21\u578b\u63a5\u5230\u81ea\u5df1\u7684\u4e1a\u52a1\u540e\u7aef，\u9ed8\u8ba4\u62ff\u5230\u7684\u5f80\u5f80\u662f\u4e00\u6574\u6bb5\u6587\u672c\u6324\u5728\u6700\u540e\u4e00\u6b21\u54cd\u5e94\u91cc\u3002\u672c\u6587\u7528 FastAPI Serve<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[66,50,132],"topic":[],"class_list":["post-106420","post","type-post","status-publish","format-standard","hentry","category-server","tag-ai","tag-50","tag-132"],"yoast_head":"\n