如何绕过报纸为某些网页抛出 503 异常

问题描述

我正在尝试使用 newspaper3k 抓取多个网页，但我的程序抛出 503 异常。谁能帮我找出原因并帮助我解决这个问题？确切地说，我不是要捕捉这些异常，而是要了解它们发生的原因并在可能的情况下防止它们。

from newspaper import Article

dates = list()
titles = list()

urls = ['https://www.rbnz.govt.nz/research-and-publications/speeches/2021/speech2021-06-29','https://www.rbnz.govt.nz/research-and-publications/speeches/2021/speech2021-06-02','https://www.rbnz.govt.nz/research-and-publications/speeches/2021/fec-mps-hearing-may-21','https://www.rbnz.govt.nz/research-and-publications/speeches/2021/speech2021-05-06','https://www.rbnz.govt.nz/research-and-publications/speeches/2021/fec-fsr-hearing-may-21','https://www.rbnz.govt.nz/research-and-publications/speeches/2021/speech2021-03-04','https://www.rbnz.govt.nz/research-and-publications/speeches/2021/fec-2019-20-reserve-bank-annual-review','https://www.rbnz.govt.nz/research-and-publications/speeches/2020/speech2020-12-02','https://www.rbnz.govt.nz/research-and-publications/speeches/2020/speech2020-10-28','https://www.rbnz.govt.nz/research-and-publications/speeches/2020/speech2020-10-22','https://www.rbnz.govt.nz/research-and-publications/speeches/2020/speech2020-10-19','https://www.rbnz.govt.nz/research-and-publications/speeches/2020/speech2020-09-14']

for url in urls:
    speech = Article(url)
    speech.download()
    speech.parse()
    dates.append(speech.publish_date)
    titles.append(speech.title)

这是我的回溯：

---------------------------------------------------------------------------
ArticleException                          Traceback (most recent call last)
<ipython-input-5-217a6cafe26a> in <module>
     20     speech = Article(url)
     21     speech.download()
---> 22     speech.parse()
     23     dates.append(speech.publish_date)
     24     titles.append(speech.title)

/opt/anaconda3/lib/python3.8/site-packages/newspaper/article.py in parse(self)
    189 
    190     def parse(self):
--> 191         self.throw_if_not_downloaded_verbose()
    192 
    193         self.doc = self.config.get_parser().fromstring(self.html)

/opt/anaconda3/lib/python3.8/site-packages/newspaper/article.py in throw_if_not_downloaded_verbose(self)
    529             raise ArticleException('You must `download()` an article first!')
    530         elif self.download_state == ArticleDownloadState.Failed_RESPONSE:
--> 531             raise ArticleException('Article `download()` Failed with %s on URL %s' %
    532                   (self.download_exception_msg,self.url))
    533 

ArticleException: Article `download()` Failed with 503 Server Error: Service Temporarily Unavailable 
for url: https://www.rbnz.govt.nz/research-and-publications/speeches/2021/speech2021-06-29 
on URL https://www.rbnz.govt.nz/research-and-publications/speeches/2021/speech2021-06-29

解决方法

您可以通过以下方式对 Python 包请求中的 503 Server Error: Service Temporarily Unavailable 错误进行故障排除。

import requests

headers = {
    'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:78.0) Gecko/20100101 Firefox/78.0'
}

base_url = 'https://www.rbnz.govt.nz/research-and-publications/speeches/2021/speech2021-06-29'
req = requests.get(base_url,headers=headers)
print(req.status_code)
# output 
503 

为什么我们会收到 503 服务器错误？

让我们看看服务器返回的内容。

import requests

headers = {
    'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:78.0) Gecko/20100101 Firefox/78.0'
}

base_url = 'https://www.rbnz.govt.nz/research-and-publications/speeches/2021/speech2021-06-29'
req = requests.get(base_url,headers=headers)
print(req.text)
# output

truncated...

<title>Website unavailable - Reserve Bank of New Zealand - Te Pūtea Matua</title>

truncated...

<p data-translate="process_is_automatic">This process is automatic. Your browser will redirect to your requested content shortly.</p>

truncated...

<form class="challenge-form" id="challenge-form" action="/research-and-publications/speeches/2021/speech2021-06-29?__cf_chl_jschl_tk__=73ad3f68fb15cc9284b25b7802626dd4ebe102cd-1625840173-0-ATQAZ5g7wCwLU2Q7agCqc1p59qs6ghpsYPVhDNwDN5r7vefk0P1UbjR4AJOUl0kUCZmDi-EVWX8XekL6VkqOgKTd1zqd5QWWlT3f2Dp_aUWQgCAH3bnS4x0wyc8-xGOLm-tcMKCXcTXH-OpiGoUX8u__bk1TIZ0gI_TYMB-oy0nJi7dMYLgJnvJhwhTllDoYUbCzmo2h2idIJPqIjNaAwupvbdpvHnrogPDnFhCe8Cco9-eKlq4w0G563f_OJ3M7YQChBjCoHYlT8baMoOLzP-Kb33rNmlG0uXhzoiIBROsPw9pavOrO1vsbqf31ZArDRuy0y7rsfrhAD7iU113zmypN81tgqgL_F8YTzygRvI_z3Cs2YOMxjB53-jq1pWwqsW_ItTaY7I3vh5lg_12EUzEddcwmuIj1wI2NbnA7EU06QNHYYn_Ye4TKM0gu9k4031hGybszE3nRKCdTXgMSgJbYhTJ6bJYPSb_2IHMUHlYyHksxePJ4C_5-5X8qIdJApSTFBfCLLLAZLrkFnBk7ep4" method="POST" enctype="application/x-www-form-urlencoded">
 
truncated...

var a = document.getElementById('cf-content');

truncated...

<p>Your access to the Reserve Bank website has been restricted. If you think you should be able to access our website please email <a href="mailto:[e-mail]">[e-mail]</a>.

如果我们查看返回的文本，我们可以看到该网站要求您的浏览器完成 challenge-form.。如果您查看文本中的其他数据点（例如 cf-content），您可以看到该网站受到 CloudFlare.

的保护

绕过这种保护非常困难。这是我最近关于绕过这种保护的复杂性的答案之一。

Can't scrape product title from a webpage