问云函数该怎么使用SSE？

curl -v -H 'Accept:text/event-stream' https://*************.ap-guangzhou.tencentscf.com/stream
*   Trying 198.18.0.147:443...
* Connected to 1301944331-klbf43hm49.ap-guangzhou.tencentscf.com (198.18.0.147) port 443
* ALPN: curl offers h2,http/1.1
* (304) (OUT), TLS handshake, Client hello (1):
*  CAfile: /etc/ssl/cert.pem
*  CApath: none
* (304) (IN), TLS handshake, Server hello (2):
* (304) (IN), TLS handshake, Unknown (8):
* (304) (IN), TLS handshake, Certificate (11):
* (304) (IN), TLS handshake, CERT verify (15):
* (304) (IN), TLS handshake, Finished (20):
* (304) (OUT), TLS handshake, Finished (20):
* SSL connection using TLSv1.3 / AEAD-CHACHA20-POLY1305-SHA256
* ALPN: server did not agree on a protocol. Uses default.
* Server certificate:
*  subject: C=CN; ST=Guangdong Province; L=Shenzhen; O=Tencent Technology (Shenzhen) Company Limited; CN=*.tencentscf.com
*  start date: Aug  9 00:00:00 2024 GMT
*  expire date: Aug  8 23:59:59 2025 GMT
*  subjectAltName: host "1301944331-klbf43hm49.ap-guangzhou.tencentscf.com" matched cert's "*.ap-guangzhou.tencentscf.com"
*  issuer: C=US; O=DigiCert, Inc.; CN=DigiCert Secure Site OV G2 TLS CN RSA4096 SHA256 2022 CA1
*  SSL certificate verify ok.
* using HTTP/1.x
> GET /stream HTTP/1.1
> Host: 1301944331-klbf43hm49.ap-guangzhou.tencentscf.com
> User-Agent: curl/8.4.0
> Accept:text/event-stream
> 
< HTTP/1.1 433 status code 433
< Content-Disposition: attachment
< Content-Length: 0
< Content-Type: text/event-stream; charset=utf-8
< Date: Sun, 08 Dec 2024 08:32:33 GMT
< Server: openresty
< Vary: Accept-Encoding
< X-Scf-Message: TimeLimitReached
< X-Scf-Private-Duration: 3000
< X-Scf-Private-Memsize: 18669568
< X-Scf-Private-Wantraffic: 0
< X-Scf-Request-Id: f3dff7ca-b53e-11ef-a20d-52540043ea0b
< X-Scf-Status: 433
< 
* Connection #0 to host 1301944331-klbf43hm49.ap-guangzhou.tencentscf.com left intact

@app.route('/')
def test():
  return 'Hello world'

curl https://*********************.ap-guangzhou.tencentscf.com
Hello world%