在Ruby中使用超时发出HTTP HEAD请求 [英] Making HTTP HEAD request with timeout in Ruby

问题描述

在Rails应用程序中，我想对资源（用户提供的URL）发出HTTP HEAD请求，以确保它存在。我也想要超时，以确保在花费一段合理的时间等待之后该方法失败。实现这一目标最直接的方法是什么（如果可能，使用标准库）？

In a Rails app, I'd like to make a HTTP HEAD request for a resource (a user-provided URL), to make sure that it exists. I'd also like a timeout, to ensure that the method fails after spending a reasonable period of time waiting. What is the most straightforward way to accomplish this (using the standard library, if possible)?

推荐答案

试试这个片段：

require 'net/http'

Net::HTTP.start('www.some_site.com') do |http|
  http.open_timeout = 2
  http.read_timeout = 2
  req = Net::HTTP::Head.new('/')
  http.request(req).each { |k, v| puts "#{k}: #{v}" }
end

希望这是您要找的是什么。

Hope this is what you're looking for.

更新

因为 head 方法看起来像

def head(path, initheader = nil)
  request(Head.new(path, initheader))
end

你可以也使用此代码段：

You can also use this snippet:

require 'net/http'

Net::HTTP.start('www.rubyinside.com') do |http|
  http.open_timeout = 2
  http.read_timeout = 2
  http.head('/').each { |k, v| puts "#{k}: #{v}" }
end

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