如何处理Nokogiri中的404 not found错误 [英] How to handle 404 not found errors in Nokogiri
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问题描述
我正在使用Nokogiri抓取网页.很少有网址需要猜测,如果网址不存在,则返回404 not found错误.有没有办法捕获此异常?
I am using Nokogiri to scrape web pages. Few urls need to be guessed and returns 404 not found error when they don't exist. Is there a way to capture this exception?
http://yoursite/page/38475 #=> page number 38475 doesn't exist
我尝试了以下无效的方法.
I tried the following which didn't work.
url = "http://yoursite/page/38475"
doc = Nokogiri::HTML(open(url)) do
begin
rescue Exception => e
puts "Try again later"
end
end
推荐答案
它不起作用,因为您没有在寻找404状态的情况下抢救会引发错误的代码部分(它是open(url)
调用).以下代码应该可以工作:
It doesn't work, because you are not rescuing part of code (it's open(url)
call) that raises an error in case of finding 404 status. The following code should work:
url = 'http://yoursite/page/38475'
begin
file = open(url)
doc = Nokogiri::HTML(file) do
# handle doc
end
rescue OpenURI::HTTPError => e
if e.message == '404 Not Found'
# handle 404 error
else
raise e
end
end
顺便说一句,关于营救Exception
:
为什么救援异常"是一种不好的样式=> Ruby中的e`?
BTW, about rescuing Exception
:
Why is it a bad style to `rescue Exception => e` in Ruby?
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