使用Ruby on Rails和Ajax从外部URL获取meta标记

class MetaController < ApplicationController
  def fetch_meta
    url = params[:url]
    response = HTTParty.get(url)
    doc = Nokogiri::HTML(response.body)
    meta_tags = doc.css('meta')
    render json: { meta_tags: meta_tags }
  end
end

<%= form_tag fetch_meta_path, method: :get, remote: true do %>
  <%= text_field_tag :url, nil, placeholder: 'Enter URL' %>
  <%= submit_tag 'Fetch Meta', id: 'fetch-meta-btn' %>
<% end %>

$(document).on('click', '#fetch-meta-btn', function(e) {
  e.preventDefault();
  var url = $('input[name="url"]').val();
  $.ajax({
    url: '/meta/fetch_meta',
    method: 'GET',
    data: { url: url },
    dataType: 'json',
    success: function(response) {
      // 处理返回的meta标记数据
      console.log(response.meta_tags);
    },
    error: function(xhr, status, error) {
      console.error(error);
    }
  });
});