ruby-on-rails - 在 Rails 3.0.3 中使用 Net::HTTP 会导致 Timeout::Error

Question

我正在 Rails 3.0.3 中试验 Net::HTTP，但由于 Timeout::Error 无法使其工作。

我有两个 Controller : Controller A 由 Controller B 调用。

Controller A(xml_provider_controller.rb):

class XmlProviderController < ApplicationController
  def availabilityByDateRequest
    respond_to do |format|
      format.xml # availabilityByDateRequest.xml.builder
    end
  end
end

文件“availabilityByDateRequest.xml.builder”是一个有效的简单静态 XML。

Controller B (mains_controller.rb):

require 'nokogiri'
require 'net/http'
require 'uri'
require "logger"

class MainsController < ApplicationController

  def search

    url = URI.parse("http://127.0.0.1:3000/xmlprovider/availabilityByDateRequest/")
    http = Net::HTTP.new(url.host, url.port)
    http.open_timeout = 10 # in seconds
    http.read_timeout = 10 # in seconds
    req = Net::HTTP::Post.new(url.path, 
                              initheader = {'Content-Type' => 'application/xml', 
                                            'Accept' => 'application/xml'})
    req.body = "<?xml version='1.0' encoding='UTF-8'?><somedata></somedata>"
    res = http.request(req)

    logger.debug res.body

    xml_doc = Nokogiri::XML(res.body)
    @results = xml_doc.xpath('//startLocation')

    respond_to do |format|
      format.html # search.html.erb
    end

  end
end

好吧，此时不需要“req.body”，因为 Controller B 仅返回静态 XML。但是，动态生成的 XML 将来会发送到 Controller A 并进行相应处理，所以我保留了它英寸。

我还定义了一条路线:

match 'xmlprovider/availabilityByDateRequest' => 'xml_provider#availabilityByDateRequest', :via => :post, :format => 'xml'

一旦我调用“http://0.0.0.0:3000/mains/search”，我就会收到超时::错误。

日志显示:

Started GET "/mains/search" for 127.0.0.1 at 2011-01-30 10:48:17 +0100
opening connection to localhost...
opened
<- "POST /xmlprovider/availabilityByDateRequest/ HTTP/1.1\r\nAccept: */*\r\nUser-Agent: Ruby\r\nConnection: close\r\nHost: localhost:3000\r\nContent-Length: 136\r\nContent-Type: application/x-www-form-urlencoded\r\n\r\n"
<- "<?xml version='1.0' encoding='UTF-8'?><somedata></somedata>"
Conn close because of error Timeout::Error
Timeout::Error (Timeout::Error):
  app/controllers/mains_controller.rb:43:in `search'
Processing by MainsController#search as HTML
...
Started POST "/xmlprovider/availabilityByDateRequest/" for 127.0.0.1 at 2011-01-30 10:48:27 +0100
  Processing by XmlProviderController#availabilityByDateRequest as XML
  Parameters: {"<?xml version"=>"'1.0' encoding='UTF-8'?><somedata><name>Test Name 1</name><description>Some data for Unit testing</description></somedata>"}
Rendered xml_provider/availabilityByDateRequest.xml.builder (8.8ms)
Completed 200 OK in 14ms (Views: 13.9ms | ActiveRecord: 0.0ms)

根据日志，调用 Controller B 并返回 XML(日志中的最后一行)。

但是，是什么导致了Timeout::Error？这当然不是处理时间不足的“超时”。有些东西卡在某个地方，很可能是在“res = http.request(req)”行

Answer 1

您是否在“当前应用程序”中发布内容？如果是，您可能需要确保至少有两个后端进程处理请求，否则该方法将自行锁定。如果您有两个后端进程处理请求，那么您最好希望它们不会都发出相同的请求;)等等。