为什么请求停止？答案

【问题标题】：Why does requests stop?为什么请求停止？
【发布时间】：2020-11-18 17:29:27
【问题描述】：

我正在使用 tkinter 和 requests 制作这个应用程序，它应该类似于下载管理器。我正在使用请求，最近我发现 requests.get(url) 函数中的 stream 关键字参数能够在下载内容时记下内容。我的问题是，当用户下载多个文件或只是大文件请求似乎停止。奇怪的是，它不会像预期的行为那样引发错误。为什么会这样？我该如何解决这个问题？没有GUI的简单版下载（我发现这个特定的url有点问题）：

import requests
import time

url = "https://aspb2.cdn.asset.aparat.com/aparat-video/a5e07b7f62ffaad0c104763c23d7393215613675-1080p.mp4?wmsAuthSign=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJ0b2tlbiI6Ijg0ZTVmNjhhMGJkNDJlMmM0MWFjZjgyNzY5YWU4NmMzIiwiZXhwIjoxNjA1NzM3NjIxLCJpc3MiOiJTYWJhIElkZWEgR1NJRyJ9.eaqnWYevFhe-CHG1TGR3SuoTbnVNBEJmLj-ZSxjtNbY"
headers = requests.head(url, headers={'accept-encoding': ''}).headers
print(headers)
r = requests.get(url, allow_redirects=True, stream=True)
# headers = r.headers
name = url.split('/')[-1].split('.')[0]
print(name)
format_name = '.' + headers['Content-Type'].split('/')[1]
file_size = int(headers['Content-Length'])
downloaded = 0
print(name + format_name)
start = last_print = time.time()
with open(name + format_name, 'wb') as fp:
    for chunk in r.iter_content(chunk_size=4096):
        downloaded += fp.write(chunk)
        now = time.time()
        if now - last_print >= 1:
            pct_done = round(downloaded / file_size * 100)
            speed = round(downloaded / (now - start) / 1024)
            print(f"Download {pct_done} % done, avg speed {speed} kbps")
            last_print = time.time()

更新：我检查了另外两个可能有答案的 stackoverflow 问题，但显然还有一些问题仍未得到解答（链接：Streaming download large file with python-requests interrupting，链接：What exactly is Python's file.flush() doing?）。我尝试使用提到的这两个功能作为问题的解决方案，但一些下载仍然停止。新版代码：

import requests
import time
import os

url = "https://aspb2.cdn.asset.aparat.com/aparat-video/a5e07b7f62ffaad0c104763c23d7393215613675-1080p.mp4?wmsAuthSign=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJ0b2tlbiI6Ijg0ZTVmNjhhMGJkNDJlMmM0MWFjZjgyNzY5YWU4NmMzIiwiZXhwIjoxNjA1NzM3NjIxLCJpc3MiOiJTYWJhIElkZWEgR1NJRyJ9.eaqnWYevFhe-CHG1TGR3SuoTbnVNBEJmLj-ZSxjtNbY"
headers = requests.head(url, headers={'accept-encoding': ''}).headers
print(headers)
r = requests.get(url, allow_redirects=True, stream=True)
name = url.split('/')[-1].split('.')[0]
print(name)
format_name = '.' + headers['Content-Type'].split('/')[1]
file_size = int(headers['Content-Length'])
downloaded = 0
print(name + format_name)
start = last_print = time.time()
with open(name + format_name, 'wb') as fp:
    for chunk in r.iter_content(chunk_size=4096):
        downloaded += fp.write(chunk)
        # Added the 'flush' and 'fsync' function as mentioned in the issues
        fp.flush()
        os.fsync(fp.fileno())
        now = time.time()
        if now - last_print >= 1:
            pct_done = round(downloaded / file_size * 100)
            speed = round(downloaded / (now - start) / 1024)
            print(f"Download {pct_done} % done, avg speed {speed} kbps")
            last_print = time.time()

即使添加了这两个功能，请求似乎也停止了。我怀疑请求有时无法保持连接，因为在一天中的某些时候，当我的互联网不那么强大时，这个问题发生得最多，但我还是不明白为什么它不会引发像 urllib 这样的错误。如果不是这种情况，那我该如何解决呢？

【问题讨论】：

这能回答你的问题吗？ Streaming download large file with python-requests interrupting
@AlexanderKvist 我检查了链接并更新了帖子。
这真的很奇怪，我不知道为什么会发生这种情况。我能想到的唯一快速解决方法是使用 range 标头请求缺少的部分。
@AlexanderKvist 我该怎么做？有这方面的教程吗？
我是一个标头，它定义您只希望响应字节的特定部分，请参阅developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Range。您可以像 accept-encoding 标头一样将其添加到您的请求中

标签： python download python-requests download-manager

【解决方案1】：

我做了 3 项更改，其中只有一项直接影响了结果。

我添加了r.raise_for_status() 来检查是否有任何错误，这是一种很好的做法。
我使用name = url.split('/')[-1].split('?')[0] 作为文件名，结果为'a5e07b7f62ffaad0c104763c23d7393215613675-1080p.mp4'，这可能是您想要的，因为它具有正确的扩展名。
我将chunk_size 增加了 64 倍，这可能就是诀窍。

import requests
import time

url = "https://aspb2.cdn.asset.aparat.com/aparat-video/a5e07b7f62ffaad0c104763c23d7393215613675-1080p.mp4?wmsAuthSign=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJ0b2tlbiI6Ijg0ZTVmNjhhMGJkNDJlMmM0MWFjZjgyNzY5YWU4NmMzIiwiZXhwIjoxNjA1NzM3NjIxLCJpc3MiOiJTYWJhIElkZWEgR1NJRyJ9.eaqnWYevFhe-CHG1TGR3SuoTbnVNBEJmLj-ZSxjtNbY"
headers = requests.head(url, headers={'accept-encoding': ''}).headers
print(headers)
r = requests.get(url, allow_redirects=True, stream=True)
r.raise_for_status() # check for errors
# headers = r.headers
name = url.split('/')[-1].split('?')[0]
print(name)
file_size = int(headers['Content-Length'])
downloaded = 0
start = last_print = time.time()
with open(name, 'wb') as fp:
    for chunk in r.iter_content(chunk_size=4096 * 64):
        downloaded += fp.write(chunk)
        now = time.time()
        if now - last_print >= 1:
            pct_done = round(downloaded / file_size * 100)
            speed = round(downloaded / (now - start) / 1024)
            print(f"Download {pct_done} % done, avg speed {speed} kbps")
            last_print = time.time()

打印：

{'Accept-Ranges': 'bytes', 'Access-Control-Allow-Headers': '*', 'Access-Control-Allow-Methods': 'GET, HEAD, OPTIONS', 'Access-Control-Allow-Origin': '*', 'Access-Control-Expose-Headers': 'Server,range,Content-Length,Content-Range', 'Cache-Control': 'max-age=8640000', 'Content-Length': '101751914', 'Content-Type': 'video/mp4', 'Date': 'Sat, 21 Nov 2020 18:04:48 GMT', 'Etag': '"5e379fa7-6109c6a"', 'Expires': 'Mon, 01 Mar 2021 18:04:48 GMT', 'Last-Modified': 'Sun, 19 Nov 2000 08:52:00 GMT'}
a5e07b7f62ffaad0c104763c23d7393215613675-1080p.mp4
Download 0 % done, avg speed 249 kbps
Download 3 % done, avg speed 1386 kbps
Download 11 % done, avg speed 3443 kbps
Download 19 % done, avg speed 4525 kbps
Download 28 % done, avg speed 5399 kbps
Download 38 % done, avg speed 6218 kbps
Download 50 % done, avg speed 6997 kbps
Download 63 % done, avg speed 7763 kbps
Download 78 % done, avg speed 8463 kbps
Download 89 % done, avg speed 8733 kbps

我应该补充一点，它也适用于我原来的 chunk_size 4096，尽管 要慢得多。老实说，我不能给你一个为什么它挂在你身上的确切原因，但肯定没有理由不尝试我建议的更大（但不是不合理的大）chunk_size。

更新

我曾多次尝试运行代码，发现性能差异很大。尽管指定了chunk_size，但代码似乎最终会以更小的块进行迭代。这是一个示例运行，它仍然完成了：

{'Accept-Ranges': 'bytes', 'Access-Control-Allow-Headers': '*', 'Access-Control-Allow-Methods': 'GET, HEAD, OPTIONS', 'Access-Control-Allow-Origin': '*', 'Access-Control-Expose-Headers': 'Server,range,Content-Length,Content-Range', 'Cache-Control': 'max-age=8640000', 'Content-Length': '101751914', 'Content-Type': 'video/mp4', 'Date': 'Sat, 21 Nov 2020 19:14:13 GMT', 'Etag': '"5e379fa7-6109c6a"', 'Expires': 'Mon, 01 Mar 2021 19:14:13 GMT', 'Last-Modified': 'Sun, 19 Nov 2000 08:52:00 GMT'}
a5e07b7f62ffaad0c104763c23d7393215613675-1080p.mp4
Download 0 % done, avg speed 243 kbps
Download 3 % done, avg speed 1240 kbps
Download 12 % done, avg speed 3803 kbps
Download 19 % done, avg speed 4484 kbps
Download 24 % done, avg speed 4601 kbps
Download 29 % done, avg speed 4615 kbps
Download 33 % done, avg speed 4503 kbps
Download 37 % done, avg speed 4411 kbps
Download 40 % done, avg speed 4126 kbps
Download 42 % done, avg speed 3907 kbps
Download 44 % done, avg speed 3674 kbps
Download 45 % done, avg speed 3462 kbps
Download 46 % done, avg speed 3238 kbps
Download 47 % done, avg speed 3061 kbps
Download 47 % done, avg speed 2913 kbps
Download 48 % done, avg speed 2753 kbps
Download 49 % done, avg speed 2613 kbps
Download 49 % done, avg speed 2504 kbps
Download 50 % done, avg speed 2396 kbps
Download 50 % done, avg speed 2286 kbps
Download 51 % done, avg speed 2190 kbps
Download 52 % done, avg speed 2108 kbps
Download 52 % done, avg speed 2035 kbps
Download 53 % done, avg speed 1975 kbps
Download 53 % done, avg speed 1907 kbps
Download 54 % done, avg speed 1859 kbps
Download 55 % done, avg speed 1831 kbps
Download 56 % done, avg speed 1796 kbps
Download 57 % done, avg speed 1759 kbps
Download 58 % done, avg speed 1724 kbps
Download 60 % done, avg speed 1693 kbps
Download 60 % done, avg speed 1663 kbps
Download 61 % done, avg speed 1633 kbps
Download 62 % done, avg speed 1605 kbps
Download 63 % done, avg speed 1580 kbps
Download 64 % done, avg speed 1555 kbps
Download 65 % done, avg speed 1536 kbps
Download 65 % done, avg speed 1515 kbps
Download 66 % done, avg speed 1496 kbps
Download 67 % done, avg speed 1476 kbps
Download 68 % done, avg speed 1456 kbps
Download 69 % done, avg speed 1438 kbps
Download 70 % done, avg speed 1421 kbps
Download 70 % done, avg speed 1405 kbps
Download 71 % done, avg speed 1391 kbps
Download 72 % done, avg speed 1372 kbps
Download 73 % done, avg speed 1357 kbps
Download 73 % done, avg speed 1344 kbps
Download 74 % done, avg speed 1330 kbps
Download 75 % done, avg speed 1320 kbps
Download 76 % done, avg speed 1310 kbps
Download 77 % done, avg speed 1297 kbps
Download 78 % done, avg speed 1289 kbps
Download 79 % done, avg speed 1284 kbps
Download 80 % done, avg speed 1279 kbps
Download 81 % done, avg speed 1275 kbps
Download 83 % done, avg speed 1272 kbps
Download 84 % done, avg speed 1271 kbps
Download 85 % done, avg speed 1270 kbps
Download 87 % done, avg speed 1269 kbps
Download 88 % done, avg speed 1265 kbps
Download 89 % done, avg speed 1260 kbps
Download 89 % done, avg speed 1252 kbps
Download 90 % done, avg speed 1244 kbps
Download 91 % done, avg speed 1237 kbps
Download 92 % done, avg speed 1230 kbps
Download 92 % done, avg speed 1224 kbps
Download 94 % done, avg speed 1214 kbps
Download 95 % done, avg speed 1204 kbps
Download 95 % done, avg speed 1195 kbps
Download 96 % done, avg speed 1186 kbps
Download 97 % done, avg speed 1177 kbps
Download 98 % done, avg speed 1168 kbps
Download 98 % done, avg speed 1160 kbps
Download 99 % done, avg speed 1151 kbps
Download 100 % done, avg speed 1144 kbps

使用urllib3的版本

import urllib3
import time

http = urllib3.PoolManager()
url = "https://aspb2.cdn.asset.aparat.com/aparat-video/a5e07b7f62ffaad0c104763c23d7393215613675-1080p.mp4?wmsAuthSign=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJ0b2tlbiI6Ijg0ZTVmNjhhMGJkNDJlMmM0MWFjZjgyNzY5YWU4NmMzIiwiZXhwIjoxNjA1NzM3NjIxLCJpc3MiOiJTYWJhIElkZWEgR1NJRyJ9.eaqnWYevFhe-CHG1TGR3SuoTbnVNBEJmLj-ZSxjtNbY"
r = http.request('HEAD', url)
headers = r.headers
print(headers)
r = http.request('GET', url, preload_content=False)
name = url.split('/')[-1].split('?')[0]
print(name)
file_size = int(headers['Content-Length'])
downloaded = 0
start = last_print = time.time()
with open(name, 'wb') as fp:
    for chunk in r.stream(4096 * 64):
        downloaded += fp.write(chunk)
        now = time.time()
        if now - last_print >= 1:
            pct_done = round(downloaded / file_size * 100)
            speed = round(downloaded / (now - start) / 1024)
            print(f"Download {pct_done} % done, avg speed {speed} kbps")
            last_print = time.time()
    r.release_conn()

使用urllib的版本

import time
from urllib.request import urlopen

url = "https://aspb2.cdn.asset.aparat.com/aparat-video/a5e07b7f62ffaad0c104763c23d7393215613675-1080p.mp4?wmsAuthSign=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJ0b2tlbiI6Ijg0ZTVmNjhhMGJkNDJlMmM0MWFjZjgyNzY5YWU4NmMzIiwiZXhwIjoxNjA1NzM3NjIxLCJpc3MiOiJTYWJhIElkZWEgR1NJRyJ9.eaqnWYevFhe-CHG1TGR3SuoTbnVNBEJmLj-ZSxjtNbY"
response = urlopen(url)
file_size = int(response.getheader('Content-Length'))
print('File size =', file_size)
name = url.split('/')[-1].split('?')[0]
print(name)
downloaded = 0
start = last_print = time.time()
with open(name, 'wb') as fp:
    while True:
        chunk = response.read(4096 * 64)
        if not chunk:
            break
        downloaded += fp.write(chunk)
        now = time.time()
        if now - last_print >= 1:
            pct_done = round(downloaded / file_size * 100)
            speed = round(downloaded / (now - start) / 1024)
            print(f"Download {pct_done} % done, avg speed {speed} kbps")
            last_print = time.time()

使用urllib 和urlretrieve 的版本

from urllib.request import urlretrieve
import time


def report_hook(numblocks, blocksize, file_size):
    global start, last_print
    now = time.time()
    if now - last_print >= 1:
        downloaded = numblocks * blocksize
        pct_done = round(downloaded / file_size * 100)
        speed = round(downloaded / (now - start) / 1024)
        print(f"Download {pct_done} % done, avg speed {speed} kbps")
        last_print = now


url = "https://aspb2.cdn.asset.aparat.com/aparat-video/a5e07b7f62ffaad0c104763c23d7393215613675-1080p.mp4?wmsAuthSign=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJ0b2tlbiI6Ijg0ZTVmNjhhMGJkNDJlMmM0MWFjZjgyNzY5YWU4NmMzIiwiZXhwIjoxNjA1NzM3NjIxLCJpc3MiOiJTYWJhIElkZWEgR1NJRyJ9.eaqnWYevFhe-CHG1TGR3SuoTbnVNBEJmLj-ZSxjtNbY"
name = url.split('/')[-1].split('?')[0]
print(name)
start = time.time()
last_print = start
urlretrieve(url, name, report_hook)

使用wget的版本

wget 非常健壮。如果您使用的是 Windows，则可以下载版本 here。第一个版本从wget 获取管道标准错误输出并显示每一行，如下所示：

--2020-11-24 09:20:02--  https://aspb2.cdn.asset.aparat.com/aparat-video/a5e07b7f62ffaad0c104763c23d7393215613675-1080p.mp4?wmsAuthSign=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJ0b2tlbiI6Ijg0ZTVmNjhhMGJkNDJlMmM0MWFjZjgyNzY5YWU4NmMzIiwiZXhwIjoxNjA1NzM3NjIxLCJpc3MiOiJTYWJhIElkZWEgR1NJRyJ9.eaqnWYevFhe-CHG1TGR3SuoTbnVNBEJmLj-ZSxjtNbY
Resolving aspb2.cdn.asset.aparat.com (aspb2.cdn.asset.aparat.com)... 91.229.46.35
Connecting to aspb2.cdn.asset.aparat.com (aspb2.cdn.asset.aparat.com)|91.229.46.35|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 101751914 (97M) [video/mp4]
Saving to: 'a5e07b7f62ffaad0c104763c23d7393215613675-1080p.mp4'

     0K ........ ........ ........ ........ ........ ........  3%  509K 3m9s
  3072K ........ ........ ........ ........ ........ ........  6% 1.36M 2m5s
  6144K ........ ........ ........ ........ ........ ........  9% 1.94M 96s
  9216K ........ ........ ........ ........ ........ ........ 12% 1.14M 88s
 12288K ........ ........ ........ ........ ........ ........ 15%  931K 86s
 15360K ........ ........ ........ ........ ........ ........ 18%  970K 83s
 18432K ........ ........ ........ ........ ........ ........ 21% 1.28M 77s
 21504K ........ ........ ........ ........ ........ ........ 24% 1.90M 69s
 24576K ........ ........ ........ ........ ........ ........ 27% 2.64M 62s
 27648K ........ ........ ........ ........ ........ ........ 30% 2.87M 56s
 30720K ........ ........ ........ ........ ........ ........ 34% 2.07M 51s
 33792K ........ ........ ........ ........ ........ ........ 37% 1.30M 49s
 36864K ........ ........ ........ ........ ........ ........ 40%  713K 49s
 39936K ........ ........ ........ ........ ........ ........ 43%  731K 49s
 43008K ........ ........ ........ ........ ........ ........ 46%  663K 48s
 46080K ........ ........ ........ ........ ........ ........ 49%  657K 48s
 49152K ........ ........ ........ ........ ........ ........ 52% 1.01M 45s
 52224K ........ ........ ........ ........ ........ ........ 55% 1.76M 41s
 55296K ........ ........ ........ ........ ........ ........ 58% 1.49M 37s
 58368K ........ ........ ........ ........ ........ ........ 61% 1.32M 34s
 61440K ........ ........ ........ ........ ........ ........ 64% 1.20M 31s
 64512K ........ ........ ........ ........ ........ ........ 68%  966K 29s
 67584K ........ ........ ........ ........ ........ ........ 71%  977K 26s
 70656K ........ ........ ........ ........ ........ ........ 74%  857K 24s
 73728K ........ ........ ........ ........ ........ ........ 77%  803K 21s
 76800K ........ ........ ........ ........ ........ ........ 80%  753K 19s
 79872K ........ ........ ........ ........ ........ ........ 83%  842K 16s
 82944K ........ ........ ........ ........ ........ ........ 86% 1.14M 13s
 86016K ........ ........ ........ ........ ........ ........ 89% 1.79M 10s
 89088K ........ ........ ........ ........ ........ ........ 92% 2.21M 7s
 92160K ........ ........ ........ ........ ........ ........ 95% 2.19M 4s
 95232K ........ ........ ........ ........ ........ ........ 98% 2.45M 1s
 98304K ........ ........                                    100% 2.54M=88s

2020-11-24 09:21:31 (1.10 MB/s) - 'a5e07b7f62ffaad0c104763c23d7393215613675-1080p.mp4' saved [101751914/101751914]

来源：

import subprocess
import time

def run_wget(url, outfile):
    cmd = ['wget', '--progress=dot:mega', '-O', outfile, url]
    p = subprocess.Popen(cmd, stderr=subprocess.PIPE, universal_newlines=True)
    for stderr_line in iter(p.stderr.readline, ""):
        yield stderr_line
    p.stderr.close()
    return_code = p.wait()
    if return_code:
        raise subprocess.CalledProcessError(return_code, cmd)

url = "https://aspb2.cdn.asset.aparat.com/aparat-video/a5e07b7f62ffaad0c104763c23d7393215613675-1080p.mp4?wmsAuthSign=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJ0b2tlbiI6Ijg0ZTVmNjhhMGJkNDJlMmM0MWFjZjgyNzY5YWU4NmMzIiwiZXhwIjoxNjA1NzM3NjIxLCJpc3MiOiJTYWJhIElkZWEgR1NJRyJ9.eaqnWYevFhe-CHG1TGR3SuoTbnVNBEJmLj-ZSxjtNbY"
name = url.split('/')[-1].split('?')[0]
print(name)
start = time.time()
for line in run_wget(url, name):
    print(line, end='')
print('Total time:', time.time() - start)

第二个版本，处理输出以生成类似于其他解决方案的列表：

a5e07b7f62ffaad0c104763c23d7393215613675-1080p.mp4
file size = 101751914
Download 3% done, avg speed 384 kbps
Download 6% done, avg speed 570 kbps
Download 9% done, avg speed 672 kbps
Download 12% done, avg speed 703 kbps
Download 15% done, avg speed 732 kbps
Download 18% done, avg speed 784 kbps
Download 21% done, avg speed 857 kbps
Download 24% done, avg speed 895 kbps
Download 27% done, avg speed 884 kbps
Download 30% done, avg speed 868 kbps
Download 34% done, avg speed 885 kbps
Download 37% done, avg speed 818 kbps
Download 40% done, avg speed 818 kbps
Download 43% done, avg speed 849 kbps
Download 46% done, avg speed 885 kbps
Download 49% done, avg speed 920 kbps
Download 52% done, avg speed 929 kbps
Download 55% done, avg speed 937 kbps
Download 58% done, avg speed 946 kbps
Download 61% done, avg speed 957 kbps
Download 64% done, avg speed 878 kbps
Download 68% done, avg speed 696 kbps
Download 71% done, avg speed 611 kbps
Download 74% done, avg speed 564 kbps
Download 77% done, avg speed 550 kbps
Download 78% done, avg speed 543 kbps
Download 80% done, avg speed 526 kbps
Download 83% done, avg speed 534 kbps
Download 86% done, avg speed 542 kbps
Download 89% done, avg speed 548 kbps
Download 92% done, avg speed 553 kbps
Download 95% done, avg speed 556 kbps
Download 98% done, avg speed 557 kbps
Download 100% done, avg speed 563 kbps
Total time: 176.51619601249695

来源：

import subprocess
import time
import re

def run_wget(url, outfile):
    cmd = ['wget', '--progress=dot:mega', '-O', outfile, url]
    p = subprocess.Popen(cmd, stderr=subprocess.PIPE, universal_newlines=True)
    for stderr_line in iter(p.stderr.readline, ""):
        yield stderr_line
    p.stderr.close()
    return_code = p.wait()
    if return_code:
        raise subprocess.CalledProcessError(return_code, cmd)

url = "https://aspb2.cdn.asset.aparat.com/aparat-video/a5e07b7f62ffaad0c104763c23d7393215613675-1080p.mp4?wmsAuthSign=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJ0b2tlbiI6Ijg0ZTVmNjhhMGJkNDJlMmM0MWFjZjgyNzY5YWU4NmMzIiwiZXhwIjoxNjA1NzM3NjIxLCJpc3MiOiJTYWJhIElkZWEgR1NJRyJ9.eaqnWYevFhe-CHG1TGR3SuoTbnVNBEJmLj-ZSxjtNbY"
name = url.split('/')[-1].split('?')[0]
print(name)
file_size = None
start = time.time()

for line in run_wget(url, name):
    if file_size is None:
        m = re.match(r'Length: (\d+)', line)
        if m:
            file_size = int(m[1])
            print('file size =', file_size)
    else:
        m = re.search(r'(\d+)%', line)
        if m:
            pct_done = int(m[1])
            downloaded = file_size / 100 * pct_done
            elapsed = time.time() - start
            speed = round(downloaded / elapsed / 1024)
            print(f"Download {pct_done}% done, avg speed {speed} kbps")

print('Total time:', time.time() - start)

【讨论】：

感谢您的代码@Booboo，我已经尝试过了，它看起来更干净更好，但是，它仍然会停止而不会引发任何错误。我发现如果我的互联网速度约为每秒 200 KB，它就会停止，所以可能与连接有关。问题是我以前对 urllib 没有任何问题，我被告知 requests 更好。至少 urllib 在失败时引发和错误。是否有更好的模块可以保持连接并且更新时间更长
你可以试试urllib3。但是，requests 是建立在urlib3 之上的，所以我不知道它是否会更好。我已经用urllib3 版本更新了答案。
我还添加了一个urllib 版本以供参考。如果这对你有用，那么也许你应该坚持下去。
我尝试了urllib3 的版本，但它仍然断开连接，但是，在我看来它的性能要好得多。对于标准urllib，它并没有结束程序，但在一定程度上它几乎没有继续。我认为我会坚持使用 urllib3。最后一个问题。这与不检查块是否存在有关吗？我见过不同的人在应用任何更改之前检查循环中的块，例如：if chunk:...。
如果有可能返回 0 长度的块，则需要 if chunk。但这对于使用迭代 for chunk in ... 流方法而不是调用 read 的 urllib3 是不可能的。见urllib3.stream documentation。您将看到永远不会返回空字符串。我已经搜索并看到了requests 的检查，并带有评论“过滤掉保持活动的新块”，但我不确定那是什么。（更多...）

【解决方案2】：

此问题可能在服务器端，如果您的客户端连接速度太慢，服务器可能会关闭请求。在慢速移动连接上使用 python 下载大文件时，我遇到过这种情况。我建议修改服务器的代码库或访问更好的连接，尽管之前的连接会是更好的长期解决方案。

祝你好运

【讨论】：

感谢您的回答，但有解决方案吗？它可以修复还是我无能为力？