ruby-on-rails - 使用 OpenUri，如何获取重定向页面的内容？

Question

我想从这个页面获取数据:

http://www.canadapost.ca/cpotools/apps/track/personal/findByTrackNumber?trackingNumber=0656887000494793

但该页面转发到:

http://www.canadapost.ca/cpotools/apps/track/personal/findByTrackNumber?execution=eXs1

所以，当我使用 open ，从 OpenUri 尝试获取数据，它抛出一个 RuntimeError错误提示 HTTP redirection loop:
我不太确定如何在重定向并抛出该错误后获取该数据。

Answer 1

您需要一个类似 Mechanize 的工具.从它的描述来看:

The Mechanize library is used for automating interaction with websites. Mechanize automatically stores and sends cookies, follows redirects, can follow links, and submit forms. Form fields can be populated and submitted. Mechanize also keeps track of the sites that you have visited as a history.

这正是您所需要的。所以，

sudo gem install mechanize

然后

require 'mechanize'
agent = WWW::Mechanize.new
page = agent.get "http://www.canadapost.ca/cpotools/apps/track/personal/findByTrackNumber trackingNumber=0656887000494793"

page.content # Get the resulting page as a string
page.body # Get the body content of the resulting page as a string
page.search(".somecss") # Search for specific elements by XPath/CSS using nokogiri

你已经准备好摇滚了。