我正在创建将处理数据的Web应用程序，因此我在Flask中使用Server Sent Event。
我需要在SSE函数中存储会话变量，但是烧瓶在函数外部看不到它。我能以某种方式解决它吗？
MWE：
server.py：
/*
Based on:
1. http://stephen.io/mediaqueries
2. https://css-tricks.com/snippets/css/media-queries-for-standard-devices/
*/
/* iPhone 6 in portrait & landscape */
@media only screen
and (min-device-width : 375px)
and (max-device-width : 667px) {
}
/* iPhone 6 in landscape */
@media only screen
and (min-device-width : 375px)
and (max-device-width : 667px)
and (orientation : landscape) {
}
/* iPhone 6 in portrait */
@media only screen
and (min-device-width : 375px)
and (max-device-width : 667px)
and (orientation : portrait) {
}
/* iPhone 6 Plus in portrait & landscape */
@media only screen
and (min-device-width : 414px)
and (max-device-width : 736px) {
}
/* iPhone 6 Plus in landscape */
@media only screen
and (min-device-width : 414px)
and (max-device-width : 736px)
and (orientation : landscape) {
}
/* iPhone 6 Plus in portrait */
@media only screen
and (min-device-width : 414px)
and (max-device-width : 736px)
and (orientation : portrait) {
}
/* iPhone 5 & 5S in portrait & landscape */
@media only screen
and (min-device-width : 320px)
and (max-device-width : 568px) {
}
/* iPhone 5 & 5S in landscape */
@media only screen
and (min-device-width : 320px)
and (max-device-width : 568px)
and (orientation : landscape) {
}
/* iPhone 5 & 5S in portrait */
@media only screen
and (min-device-width : 320px)
and (max-device-width : 568px)
and (orientation : portrait) {
}
/*
iPhone 2G, 3G, 4, 4S Media Queries
It's noteworthy that these media queries are also the same for iPod Touch generations 1-4.
*/
/* iPhone 2G-4S in portrait & landscape */
@media only screen
and (min-device-width : 320px)
and (max-device-width : 480px) {
}
/* iPhone 2G-4S in landscape */
@media only screen
and (min-device-width : 320px)
and (max-device-width : 480px)
and (orientation : landscape) {
}
/* iPhone 2G-4S in portrait */
@media only screen
and (min-device-width : 320px)
and (max-device-width : 480px)
and (orientation : portrait) {
}
/* iPad in portrait & landscape */
@media only screen
and (min-device-width : 768px)
and (max-device-width : 1024px) {
}
/* iPad in landscape */
@media only screen
and (min-device-width : 768px)
and (max-device-width : 1024px)
and (orientation : landscape) {
}
/* iPad in portrait */
@media only screen
and (min-device-width : 768px)
and (max-device-width : 1024px)
and (orientation : portrait) {
}
/* Galaxy S3 portrait and landscape */
@media screen
and (device-width: 320px)
and (device-height: 640px)
and (-webkit-device-pixel-ratio: 2) {
}
/* Galaxy S3 portrait */
@media screen
and (device-width: 320px)
and (device-height: 640px)
and (-webkit-device-pixel-ratio: 2)
and (orientation: portrait) {
}
/* Galaxy S3 landscape */
@media screen
and (device-width: 320px)
and (device-height: 640px)
and (-webkit-device-pixel-ratio: 2)
and (orientation: landscape) {
}
/* Galaxy S4 portrait and landscape */
@media screen
and (device-width: 320px)
and (device-height: 640px)
and (-webkit-device-pixel-ratio: 3) {
}
/* Galaxy S4 portrait */
@media screen
and (device-width: 320px)
and (device-height: 640px)
and (-webkit-device-pixel-ratio: 3)
and (orientation: portrait) {
}
/* Galaxy S4 landscape */
@media screen
and (device-width: 320px)
and (device-height: 640px)
and (-webkit-device-pixel-ratio: 3)
and (orientation: landscape) {
}
/* Galaxy S5 portrait and landscape */
@media screen
and (device-width: 360px)
and (device-height: 640px)
and (-webkit-device-pixel-ratio: 3) {
}
/* Galaxy S5 portrait */
@media screen
and (device-width: 360px)
and (device-height: 640px)
and (-webkit-device-pixel-ratio: 3)
and (orientation: portrait) {
}
/* Galaxy S5 landscape */
@media screen
and (device-width: 360px)
and (device-height: 640px)
and (-webkit-device-pixel-ratio: 3)
and (orientation: landscape) {
}
/* HTC One portrait and landscape */
@media screen
and (device-width: 360px)
and (device-height: 640px)
and (-webkit-device-pixel-ratio: 3) {
}
/* HTC One portrait */
@media screen
and (device-width: 360px)
and (device-height: 640px)
and (-webkit-device-pixel-ratio: 3)
and (orientation: portrait) {
}
/* HTC One landscape */
@media screen
and (device-width: 360px)
and (device-height: 640px)
and (-webkit-device-pixel-ratio: 3)
and (orientation: landscape) {
}
/*
iPad 3 & 4 Media Queries
If you're looking to target only 3rd and 4th generation Retina iPads
(or tablets with similar resolution) to add @2x graphics,
or other features for the tablet's Retina display, use the following media queries.
*/
/* Retina iPad in portrait & landscape */
@media only screen
and (min-device-width : 768px)
and (max-device-width : 1024px)
and (-webkit-min-device-pixel-ratio: 2) {
}
/* Retina iPad in landscape */
@media only screen
and (min-device-width : 768px)
and (max-device-width : 1024px)
and (orientation : landscape)
and (-webkit-min-device-pixel-ratio: 2) {
}
/* Retina iPad in portrait */
@media only screen
and (min-device-width : 768px)
and (max-device-width : 1024px)
and (orientation : portrait)
and (-webkit-min-device-pixel-ratio: 2) {
}
/*
iPad 1 & 2 Media Queries
If you're looking to supply different graphics or choose different typography
for the lower resolution iPad display, the media queries below will work
like a charm in your responsive design!
*/
/* iPad 1 & 2 in portrait & landscape */
@media only screen
and (min-device-width : 768px)
and (max-device-width : 1024px)
and (-webkit-min-device-pixel-ratio: 1) {
}
/* iPad 1 & 2 in landscape */
@media only screen
and (min-device-width : 768px)
and (max-device-width : 1024px)
and (orientation : landscape)
and (-webkit-min-device-pixel-ratio: 1) {
}
/* iPad 1 & 2 in portrait */
@media only screen
and (min-device-width : 768px)
and (max-device-width : 1024px)
and (orientation : portrait)
and (-webkit-min-device-pixel-ratio: 1) {
}
/* iPad mini in portrait & landscape */
@media only screen
and (min-device-width : 768px)
and (max-device-width : 1024px)
and (-webkit-min-device-pixel-ratio: 1) {
}
/* iPad mini in landscape */
@media only screen
and (min-device-width : 768px)
and (max-device-width : 1024px)
and (orientation : landscape)
and (-webkit-min-device-pixel-ratio: 1) {
}
/* iPad mini in portrait */
@media only screen
and (min-device-width : 768px)
and (max-device-width : 1024px)
and (orientation : portrait)
and (-webkit-min-device-pixel-ratio: 1) {
}
/* Galaxy Tab 10.1 portrait and landscape */
@media
(min-device-width: 800px)
and (max-device-width: 1280px) {
}
/* Galaxy Tab 10.1 portrait */
@media
(max-device-width: 800px)
and (orientation: portrait) {
}
/* Galaxy Tab 10.1 landscape */
@media
(max-device-width: 1280px)
and (orientation: landscape) {
}
/* Asus Nexus 7 portrait and landscape */
@media screen
and (device-width: 601px)
and (device-height: 906px)
and (-webkit-min-device-pixel-ratio: 1.331)
and (-webkit-max-device-pixel-ratio: 1.332) {
}
/* Asus Nexus 7 portrait */
@media screen
and (device-width: 601px)
and (device-height: 906px)
and (-webkit-min-device-pixel-ratio: 1.331)
and (-webkit-max-device-pixel-ratio: 1.332)
and (orientation: portrait) {
}
/* Asus Nexus 7 landscape */
@media screen
and (device-width: 601px)
and (device-height: 906px)
and (-webkit-min-device-pixel-ratio: 1.331)
and (-webkit-max-device-pixel-ratio: 1.332)
and (orientation: landscape) {
}
/* Kindle Fire HD 7" portrait and landscape */
@media only screen
and (min-device-width: 800px)
and (max-device-width: 1280px)
and (-webkit-min-device-pixel-ratio: 1.5) {
}
/* Kindle Fire HD 7" portrait */
@media only screen
and (min-device-width: 800px)
and (max-device-width: 1280px)
and (-webkit-min-device-pixel-ratio: 1.5)
and (orientation: portrait) {
}
/* Kindle Fire HD 7" landscape */
@media only screen
and (min-device-width: 800px)
and (max-device-width: 1280px)
and (-webkit-min-device-pixel-ratio: 1.5)
and (orientation: landscape) {
}
/* Kindle Fire HD 8.9" portrait and landscape */
@media only screen
and (min-device-width: 1200px)
and (max-device-width: 1600px)
and (-webkit-min-device-pixel-ratio: 1.5) {
}
/* Kindle Fire HD 8.9" portrait */
@media only screen
and (min-device-width: 1200px)
and (max-device-width: 1600px)
and (-webkit-min-device-pixel-ratio: 1.5)
and (orientation: portrait) {
}
/* Kindle Fire HD 8.9" landscape */
@media only screen
and (min-device-width: 1200px)
and (max-device-width: 1600px)
and (-webkit-min-device-pixel-ratio: 1.5)
and (orientation: landscape) {
}
/* Laptops non-retina screens */
@media screen
and (min-device-width: 1200px)
and (max-device-width: 1600px)
and (-webkit-min-device-pixel-ratio: 1) {
}
/* Laptops retina screens */
@media screen
and (min-device-width: 1200px)
and (max-device-width: 1600px)
and (-webkit-min-device-pixel-ratio: 2)
and (min-resolution: 192dpi) {
}
/* Apple Watch */
@media
(max-device-width: 42mm)
and (min-device-width: 38mm) {
}
/* Moto 360 Watch */
@media
(max-device-width: 218px)
and (max-device-height: 281px) {
}progress.html：
from flask import Flask, render_template, session, Response, stream_with_context
import time
app = Flask(__name__)
app.secret_key = b'132d2dcf59f9604c0b48e4e3a1a1cd19a0abf121b48a4777'
@app.route('/')
def get_page():
return render_template('progress.html')
@app.route('/progress')
def progress():
def generate():
x = 0
while x < 100:
x = x + 10
print(x)
time.sleep(0.2)
yield "data:" + str(x) + "\n\n"
session['result'] = x
print(session['result']) #100
return Response(stream_with_context(generate()), mimetype= 'text/event-stream')
@app.route('/done')
def done():
print(session['result']) #KeyError: 'result'
return session['result']
if __name__ == '__main__':
app.run(debug=True)
答案 0 :(得分：1)
会话是一个cookie。 Cookie以标头形式发送。在发送其余流之前，首先在响应中发送标头。开始响应后，您无法修改会话。在流中发送您需要的任何数据，并在接收端处理它。