Question

我正在使用以下代码运行几个HTTP请求，但第二个请求（req2）始终返回到errback。

我错过了一些明显的东西吗？

request_options = {
  :body => " ",
  :keepalive => true,
  :head => {
    'content-type' => 'application/json',
    'accept' => 'application/json',
    'Accept-Encoding' => 'gzip,deflate,sdch'
  }
}

EM.run do
  request_options[:path] = '/default/path'

  conn = EM::HttpRequest.new 'https://www.example.com'

  req1 = conn.post request_options
  req1.errback { p 'Uh, oh'; EM.stop }
  req1.callback do
    doc = JSON.parse req1.response

    # do stuff with doc

    request_options[:body] = 'post-data'
    request_options[:path] = '/new/path'

    req2 = conn.post request_options
    req2.errback { p 'Uh, oh'; EM.stop }
    req2.callback do
       puts req2.response
       EM.stop
    end
  end
end

Answer 1

我使用 EM-Synchrony

解决了我的问题

gem install em-synchrony

安装了这个gem后，我可以使用以下代码来使代码按预期工作。

request_options = {
  :body => " ",
  :keepalive => true,
  :head => {
    'content-type' => 'application/json',
    'accept' => 'application/json',
    'Accept-Encoding' => 'gzip,deflate,sdch'
  }
}

EM.synchrony do
  request_options[:path] = '/default/path'

  conn = EM::HttpRequest.new 'https://www.example.com'

  req1 = conn.post request_options
  doc = JSON.parse req1.response

  # do stuff with doc

  request_options[:body] = 'post-data'
  request_options[:path] = '/new/path'

  req2 = conn.post request_options
  puts req2.response

  EM.stop
end

我想我只是对EM.run执行异步请求和di。

的方式感到困惑

Answer 2

您无法在响应回调中使用相同的连接对象。

确保为第二个请求创建新的EM::HttpRequest.new 'https://www.example.com'。

EventMachine :: HttpRequest和Keep-alive连接

2 个答案: