Python Flask : Route vs add_url_rule, SSE

Question

使用 add_url_rule 失败，但 @app.route('') 工作正常。

您好，我正在尝试将 SSE(服务器发送事件)添加到 Python Flask 应用程序中。不幸的是，该应用程序使用 SOMEOBJECT.app.add_url_rule管理路线，因此在这种情况下使用装饰器对我不起作用。

from flask import Flask, Response
import random
import time

app = Flask(__name__)
def eventStream():
    # will send simple SSE style responses
    while True:
        waittt = random.random()
        time.sleep(waittt)
        yield "data: {}\n\n".format(str(waittt))
# This route works fine :)
@app.route("/streamroute")
def stream():
    return Response(eventStream(), mimetype="text/event-stream")

# This route doesn't work :(
app.add_url_rule("/stream", stream)
app.run(debug=True)

好的curl <a href="http://localhost:5000/streamroute" rel="noreferrer noopener nofollow">http://localhost:5000/streamroute</a>

KO curl <a href="http://localhost:5000/stream" rel="noreferrer noopener nofollow">http://localhost:5000/stream</a>

Answer 1

from flask import Flask, Response                                              
import random                                                                  
import time                                                                    
                                                                               
app = Flask(__name__)                                                          
def eventStream():                                                             
    # will send simple SSE style responses                                     
    while True:                                                                
        waittt = random.random()                                               
        time.sleep(waittt)                                                     
        yield "data: {}\n\n".format(str(waittt))                               
# This route works fine :)                                                     
@app.route('/streamroute')                                                     
def stream():                                                                  
    return Response(eventStream(), mimetype="text/event-stream")               
                                                                               
# This route doesn't work :(                                                   
app.add_url_rule('/stream', 'stream', stream)                                   
app.run(debug=True)    

请参阅下面的文档，正确的语法是:

app.add_url_rule('/stream', 'stream', stream)        

了解更多:https://flask.palletsprojects.com/en/2.0.x/api/#flask.Flask.add_url_rule