防止烧瓶应用迫使浏览器等待背景过程

发布于 2025-01-23 11:53:43 字数 1839 浏览 4 评论 0原文

我在本地主机上运行以下烧瓶应用程序。然后，我使用http请求在地址/ place_job/上击中该应用程序。之后，我继续浏览器，查找地址/track_site/job/0

预期行为：立即显示“ foo”一词。

实际行为：< / strong>浏览器（edge / chrome）等待 /旋转，直到线完成为止，然后立即显示foo

问题：< / strong>为什么实际行为发生，而不是预期的行为，我该如何解决？最好不要分类芹菜或喜欢的人。

我不明白为什么会发生这种情况。我真正想到的是，如果我删除＆lt; script＆gt;线在.html文件中。我已经使用螺纹。Thread和theadpool opecutor进行了测试。

minimal_app.py：

from flask import Flask, render_template
from threading import Thread
from time import time

app = Flask(__name__)

def func():
    print("started")
    start_time = time()
    while time()-start_time<20: pass
    print("ended")

@app.route('/place_job/')
def place_job():
    Thread(target=func).start()
    return "OK"

@app.route('/track_site/job/0')
def track_job():
    return render_template('minimal_template.html')

static/static/minimal_template.html

<!DOCTYPE html>
<html lang="en">
    <body>
        <h1 id="id1"> Job Page </h1>
        <script type="text/javascript" src="/static/js/const.js"></script>
        <p id="id2"> foo </p>
    </body>
</html>

static/js/static/js/static/js/const.js

const x = 0;

以下是请求/plot_job/flask log/然后导航到/track_site/job/0：

127.0.0.1 - - [22/Apr/2022 20:15:04] "GET /place_job HTTP/1.1" 308 -
127.0.0.1 - - [22/Apr/2022 20:15:04] "GET /place_job/ HTTP/1.1" 200 -
started
127.0.0.1 - - [22/Apr/2022 20:15:12] "GET /track_site/job/0 HTTP/1.1" 200 -
ended
127.0.0.1 - - [22/Apr/2022 20:15:24] "GET /static/js/const.js HTTP/1.1" 304 -

原文

I run the following flask app on local host. I then hit the app on address/place_job/ with a http request. afterwards i go on my browser and look up address/track_site/job/0

expected behavior: The word "foo" show up immediately.

actual behavior: The browser (edge / Chrome) waits / spins until the thread finishes, and then immediately displays the word foo

Question: Why is the actual behavior happening, instead of the expected behavior, and how do i fix it? Preferably without sorting to celery or the likes.

I don't understand why this happens. What really bugs my mind, is that the expected behavior occurs If i delete the <script> line in the .HTML file. I have tested it with threading.Thread, as well as the threadpool executor from the flask-executor package.

minimal_app.py:

from flask import Flask, render_template
from threading import Thread
from time import time

app = Flask(__name__)

def func():
    print("started")
    start_time = time()
    while time()-start_time<20: pass
    print("ended")

@app.route('/place_job/')
def place_job():
    Thread(target=func).start()
    return "OK"

@app.route('/track_site/job/0')
def track_job():
    return render_template('minimal_template.html')

static/templates/minimal_template.html

<!DOCTYPE html>
<html lang="en">
    <body>
        <h1 id="id1"> Job Page </h1>
        <script type="text/javascript" src="/static/js/const.js"></script>
        <p id="id2"> foo </p>
    </body>
</html>

static/js/const.js

const x = 0;

edit

Below is the flask log after requesting /place_job/ and afterwards navigating to /track_site/job/0 :

127.0.0.1 - - [22/Apr/2022 20:15:04] "GET /place_job HTTP/1.1" 308 -
127.0.0.1 - - [22/Apr/2022 20:15:04] "GET /place_job/ HTTP/1.1" 200 -
started
127.0.0.1 - - [22/Apr/2022 20:15:12] "GET /track_site/job/0 HTTP/1.1" 200 -
ended
127.0.0.1 - - [22/Apr/2022 20:15:24] "GET /static/js/const.js HTTP/1.1" 304 -

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