为什么aws sdk ruby连接到'；169.254.169.254'；关于初始化？

我安装了gem

webmock

，它在测试套件期间阻止外部连接。安装之后，运行测试套件时得到了意外的结果

我有点困惑为什么aws sdk需要在初始化时连接到

169.254.169.254

rspec spec/models/concerns/posconcern_spec.rb
[Coveralls] Set up the SimpleCov formatter.
[Coveralls] Using SimpleCov's 'rails' settings.

An error occurred while loading ./spec/models/concerns/posconcern_spec.rb.
Failure/Error: require File.expand_path('../../config/environment', __FILE__)

WebMock::NetConnectNotAllowedError:
  Real HTTP connections are disabled. Unregistered request: GET http://169.254.169.254/latest/meta-data/iam/security-credentials/ with headers {'Accept'=>'*/*', 'Accept-Encoding'=>'gzip;q=1.0,deflate;q=0.6,identity;q=0.3', 'User-Agent'=>'Ruby'}

  You can stub this request with the following snippet:

  stub_request(:get, "http://169.254.169.254/latest/meta-data/iam/security-credentials/").
    with(headers: {'Accept'=>'*/*', 'Accept-Encoding'=>'gzip;q=1.0,deflate;q=0.6,identity;q=0.3', 'User-Agent'=>'Ruby'}).
    to_return(status: 200, body: "", headers: {})

  ============================================================
# /home/andey/.rvm/gems/ruby-2.3.4/gems/webmock-3.1.0/lib/webmock/http_lib_adapters/net_http.rb:114:in `request'
# /home/andey/.rvm/gems/ruby-2.3.4/gems/aws-sdk-core-2.10.52/lib/aws-sdk-core/instance_profile_credentials.rb:109:in `http_get'
# /home/andey/.rvm/gems/ruby-2.3.4/gems/aws-sdk-core-2.10.52/lib/aws-sdk-core/instance_profile_credentials.rb:90:in `block (2 levels) in get_credentials'
# /home/andey/.rvm/gems/ruby-2.3.4/gems/aws-sdk-core-2.10.52/lib/aws-sdk-core/instance_profile_credentials.rb:105:in `open_connection'
# /home/andey/.rvm/gems/ruby-2.3.4/gems/aws-sdk-core-2.10.52/lib/aws-sdk-core/instance_profile_credentials.rb:88:in `block in get_credentials'
# /home/andey/.rvm/gems/ruby-2.3.4/gems/aws-sdk-core-2.10.52/lib/aws-sdk-core/instance_profile_credentials.rb:121:in `retry_errors'
# /home/andey/.rvm/gems/ruby-2.3.4/gems/aws-sdk-core-2.10.52/lib/aws-sdk-core/instance_profile_credentials.rb:87:in `get_credentials'
# /home/andey/.rvm/gems/ruby-2.3.4/gems/aws-sdk-core-2.10.52/lib/aws-sdk-core/instance_profile_credentials.rb:73:in `block in refresh'
# /home/andey/.rvm/gems/ruby-2.3.4/gems/aws-sdk-core-2.10.52/lib/aws-sdk-core/instance_profile_credentials.rb:121:in `retry_errors'
# /home/andey/.rvm/gems/ruby-2.3.4/gems/aws-sdk-core-2.10.52/lib/aws-sdk-core/instance_profile_credentials.rb:72:in `refresh'
# /home/andey/.rvm/gems/ruby-2.3.4/gems/aws-sdk-core-2.10.52/lib/aws-sdk-core/refreshing_credentials.rb:20:in `initialize'
# /home/andey/.rvm/gems/ruby-2.3.4/gems/aws-sdk-core-2.10.52/lib/aws-sdk-core/instance_profile_credentials.rb:51:in `initialize'
# /home/andey/.rvm/gems/ruby-2.3.4/gems/aws-sdk-core-2.10.52/lib/aws-sdk-core/credential_provider_chain.rb:90:in `new'
# /home/andey/.rvm/gems/ruby-2.3.4/gems/aws-sdk-core-2.10.52/lib/aws-sdk-core/credential_provider_chain.rb:90:in `instance_profile_credentials'
# /home/andey/.rvm/gems/ruby-2.3.4/gems/aws-sdk-core-2.10.52/lib/aws-sdk-core/credential_provider_chain.rb:12:in `block in resolve'
# /home/andey/.rvm/gems/ruby-2.3.4/gems/aws-sdk-core-2.10.52/lib/aws-sdk-core/credential_provider_chain.rb:11:in `each'
# /home/andey/.rvm/gems/ruby-2.3.4/gems/aws-sdk-core-2.10.52/lib/aws-sdk-core/credential_provider_chain.rb:11:in `resolve'
# /home/andey/.rvm/gems/ruby-2.3.4/gems/aws-sdk-core-2.10.52/lib/aws-sdk-core/plugins/request_signer.rb:37:in `block in <class:RequestSigner>'
# /home/andey/.rvm/gems/ruby-2.3.4/gems/aws-sdk-core-2.10.52/lib/seahorse/client/configuration.rb:70:in `call'
# /home/andey/.rvm/gems/ruby-2.3.4/gems/aws-sdk-core-2.10.52/lib/seahorse/client/configuration.rb:205:in `block in resolve_defaults'
# /home/andey/.rvm/gems/ruby-2.3.4/gems/aws-sdk-core-2.10.52/lib/seahorse/client/configuration.rb:57:in `each'
# /home/andey/.rvm/gems/ruby-2.3.4/gems/aws-sdk-core-2.10.52/lib/seahorse/client/configuration.rb:57:in `each'
# /home/andey/.rvm/gems/ruby-2.3.4/gems/aws-sdk-core-2.10.52/lib/seahorse/client/configuration.rb:204:in `resolve_defaults'
# /home/andey/.rvm/gems/ruby-2.3.4/gems/aws-sdk-core-2.10.52/lib/seahorse/client/configuration.rb:200:in `value_at'
# /home/andey/.rvm/gems/ruby-2.3.4/gems/aws-sdk-core-2.10.52/lib/seahorse/client/configuration.rb:189:in `block in resolve'
# /home/andey/.rvm/gems/ruby-2.3.4/gems/aws-sdk-core-2.10.52/lib/seahorse/client/configuration.rb:189:in `resolve'
# /home/andey/.rvm/gems/ruby-2.3.4/gems/aws-sdk-core-2.10.52/lib/seahorse/client/configuration.rb:177:in `apply_defaults'
# /home/andey/.rvm/gems/ruby-2.3.4/gems/aws-sdk-core-2.10.52/lib/seahorse/client/configuration.rb:150:in `build!'
# /home/andey/.rvm/gems/ruby-2.3.4/gems/aws-sdk-core-2.10.52/lib/seahorse/client/base.rb:68:in `build_config'
# /home/andey/.rvm/gems/ruby-2.3.4/gems/aws-sdk-core-2.10.52/lib/seahorse/client/base.rb:19:in `initialize'
# /home/andey/.rvm/gems/ruby-2.3.4/gems/aws-sdk-core-2.10.52/lib/seahorse/client/base.rb:105:in `new'
# ./config/initializers/aws.rb:1:in `<top (required)>'
# /home/andey/.rvm/gems/ruby-2.3.4/gems/activesupport-4.2.9/lib/active_support/dependencies.rb:268:in `load'
# /home/andey/.rvm/gems/ruby-2.3.4/gems/activesupport-4.2.9/lib/active_support/dependencies.rb:268:in `block in load'
# /home/andey/.rvm/gems/ruby-2.3.4/gems/activesupport-4.2.9/lib/active_support/dependencies.rb:240:in `load_dependency'
# /home/andey/.rvm/gems/ruby-2.3.4/gems/activesupport-4.2.9/lib/active_support/dependencies.rb:268:in `load'
# /home/andey/.rvm/gems/ruby-2.3.4/gems/railties-4.2.9/lib/rails/engine.rb:652:in `block in load_config_initializer'
# /home/andey/.rvm/gems/ruby-2.3.4/gems/activesupport-4.2.9/lib/active_support/notifications.rb:166:in `instrument'
# /home/andey/.rvm/gems/ruby-2.3.4/gems/railties-4.2.9/lib/rails/engine.rb:651:in `load_config_initializer'
# /home/andey/.rvm/gems/ruby-2.3.4/gems/railties-4.2.9/lib/rails/engine.rb:616:in `block (2 levels) in <class:Engine>'
# /home/andey/.rvm/gems/ruby-2.3.4/gems/railties-4.2.9/lib/rails/engine.rb:615:in `each'
# /home/andey/.rvm/gems/ruby-2.3.4/gems/railties-4.2.9/lib/rails/engine.rb:615:in `block in <class:Engine>'
# /home/andey/.rvm/gems/ruby-2.3.4/gems/railties-4.2.9/lib/rails/initializable.rb:30:in `instance_exec'
# /home/andey/.rvm/gems/ruby-2.3.4/gems/railties-4.2.9/lib/rails/initializable.rb:30:in `run'
# /home/andey/.rvm/gems/ruby-2.3.4/gems/railties-4.2.9/lib/rails/initializable.rb:55:in `block in run_initializers'
# /home/andey/.rvm/gems/ruby-2.3.4/gems/railties-4.2.9/lib/rails/initializable.rb:44:in `each'
# /home/andey/.rvm/gems/ruby-2.3.4/gems/railties-4.2.9/lib/rails/initializable.rb:44:in `tsort_each_child'
# /home/andey/.rvm/gems/ruby-2.3.4/gems/railties-4.2.9/lib/rails/initializable.rb:54:in `run_initializers'
# /home/andey/.rvm/gems/ruby-2.3.4/gems/railties-4.2.9/lib/rails/application.rb:352:in `initialize!'
# ./config/environment.rb:5:in `<top (required)>'
# ./spec/rails_helper.rb:3:in `require'
# ./spec/rails_helper.rb:3:in `<top (required)>'
# ./spec/models/concerns/posconcern_spec.rb:1:in `require'
# ./spec/models/concerns/posconcern_spec.rb:1:in `<top (required)>'

rspec规范/模型/关注点/关注点\u规范rb
[工作服]设置SimpleCov格式化程序。
[工作服]使用SimpleCov的“rails”设置。
加载时出错。/spec/models/concerns/posconcern_spec.rb。
失败/错误：需要文件。展开\u路径（“../../config/environment”，\u文件\u）
WebMock:：NetConnectNotAllowedError:
真正的HTTP连接被禁用。未注册的请求：获取http://169.254.169.254/latest/meta-data/iam/security-credentials/ 带有标题{'Accept'=>'*/*'，'Accept Encoding'=>'gzip；q=1.0，deflate；q=0.6，identity；q=0.3'，'User Agent'=>'Ruby'}
您可以使用以下代码段来存根此请求：
存根请求（：get，“http://169.254.169.254/latest/meta-data/iam/security-credentials/").
带有（标题：{'Accept'=>'*/*'，'Accept Encoding'=>'gzip；q=1.0，deflate；q=0.6，identity；q=0.3'，'User Agent'=>'Ruby'}）。
返回（状态：200，正文：，标题：{}）
============================================================
#/home/andey/.rvm/gems/ruby-2.3.4/gems/webmock-3.1.0/lib/webmock/http_lib_adapters/net_http.rb:114:在“请求”中
#/home/andey/.rvm/gems/ruby-2.3.4/gems/aws-sdk-core-2.10.52/lib/aws-sdk-core/instance\u profile\u credentials.rb:109:in'http\u-get'
#/home/andey/.rvm/gems/ruby-2.3.4/gems/aws-sdk-core-2.10.52/lib/aws-sdk-core/instance_profile_-credentials.rb:90:get_-credentials中的“块（2级）”中
#/home/andey/.rvm/gems/ruby-2.3.4/gems/aws-sdk-core-2.10.52/lib/aws-sdk-core/instance\u profile\u credentials.rb:105:在“开放式”连接中
#/home/andey/.rvm/gems/ruby-2.3.4/gems/aws-sdk-core-2.10.52/lib/aws-sdk-core/instance\u profile\u-credentials.rb:88:in`block in get\u-credentials'
#/home/andey/.rvm/gems/ruby-2.3.4/gems/aws-sdk-core-2.10.52/lib/aws-sdk-core/instance\u profile\u credentials.rb:121:在“重试错误”中
#/home/andey/.rvm/gems/ruby-2.3.4/gems/aws-sdk-core-2.10.52/lib/aws-sdk-core/instance\u profile\u credentials.rb:87:in'get\u credentials'
#/home/andey/.rvm/gems/ruby-2.3.4/gems/aws-sdk-core-2.10.52/lib/aws-sdk-core/instance\u profile\u credentials.rb:73:在“刷新中的块”中
#/home/andey/.rvm/gems/ruby-2.3.4/gems/aws-sdk-core-2.10.52/lib/aws-sdk-core/instance\u profile\u credentials.rb:121:在“重试错误”中
#/home/andey/.rvm/gems/ruby-2.3.4/gems/aws-sdk-core-2.10.52/lib/aws-sdk-core/instance\u profile\u credentials.rb:72:in'refresh'
#/home/andey/.rvm/gems/ruby-2.3.4/gems/aws-sdk-core-2.10.52/lib/aws-sdk-core/refreshing_-credentials.rb:20:in'initialize'
#/home/andey/.rvm/gems/ruby-2.3.4/gems/aws-sdk-core-2.10.52/lib/aws-sdk-core/instance\u profile\u credentials.rb:51:in'initialize'
#/home/andey/.rvm/gems/ruby-2.3.4/gems/aws-sdk-core-2.10.52/lib/aws-sdk-core/credential\u provider\u chain.rb:90:in'new'
#/home/andey/.rvm/gems/ruby-2.3.4/gems/aws-sdk-core-2.10.52/lib/aws-sdk-core/credential\u provider\u chain.rb:90:in'instance\u profile\u credentials'
#/home/andey/.rvm/gems/ruby-2.3.4/gems/aws-sdk-core-2.10.52/lib/aws-sdk-core/credential\u provider\u chain.rb:12:in'block in resolve'
#/home/andey/.rvm/gems/ruby-2.3.4/gems/aws-sdk-core-2.10.52/lib/aws-sdk-core/credential\u provider\u chain.rb:11:in'each'
#/home/andey/.rvm/gems/ruby-2.3.4/gems/aws-sdk-core-2.10.52/lib/aws-sdk-core/credential\u provider\u chain.rb:11:in'resolve'
#/home/andey/.rvm/gems/ruby-2.3.4/gems/aws-sdk-core-2.10.52/lib/aws-sdk-core/plugins/request_-signer.rb:37:in'block-in'
#/home/andey/.rvm/gems/ruby-2.3.4/gems/aws-sdk-core-2.10.52/lib/seahorse/client/configuration.rb:70:in'call'
#/home/andey/.rvm/gems/ruby-2.3.4/gems/aws-sdk-core-2.10.52/lib/seahorse/client/configuration.rb:205:在“解析中的块默认值”中
#/home/andey/.rvm/gems/ruby-2.3.4/gems/aws-sdk-core-2.10.52/lib/seahorse/client/configuration.rb:57:in'each'
#/home/andey/.rvm/gems/ruby-2.3.4/gems/aws-sdk-core-2.10.52/lib/seahorse/client/configuration.rb:57:in'each'
#/home/andey/.rvm/gems/ruby-2.3.4/gems/aws-sdk-core-2.10.52/lib/seahorse/client/configuration.rb:204:在“解析默认值”中
#/home/andey/.rvm/gems/ruby-2.3.4/gems/aws-sdk-core-2.10.52/lib/seahorse/client/configuration.rb:200:in'value_at'
#/home/andey/.rvm/gems/ruby-2.3.4/gems/aws-sdk-core-2.10.52/lib/seahorse/client/configuration.rb:189:在“解析中的块”中
#/home/andey/.rvm/gems/ruby-2.3.4/gems/aws-sdk-core-2.10.52/lib/seahorse/client/configuration.rb:189:在“解析”中
#/home/andey/.rvm/gems/ruby-2.3.4/gems/aws-sdk-core-2.10.52/lib/seahorse/client/configuration.rb:177:in“应用默认值”
#/home/andey/.rvm/gems/ruby-2.3.4/gems/aws-sdk-core-2.10.52/lib/seahorse/client/configuration.rb:150:in'build！'
#/home/andey/.rvm/gems/ruby-2.3.4/gems/aws-sdk-core-2.10.52/lib/seahorse/client/base.rb:68:in'build\u config'
#/home/andey/.rvm/gems/ruby-2.3.4/gems/aws-sdk-core-2.10.52/lib/seahorse/client/base.rb:19:in'initialize'
#/home/andey/.rvm/gems/ruby-2.3.4/gems/aws-sdk-core-2.10.52/lib/seahorse/client/base.rb:105:in'new'
#./config/initializers/aws.rb:1:in`'
#/home/andey/.rvm/gems/ruby-2.3.4/gems/activesupport-4.2.9/lib/active\u support/dependencies.rb:268:in'load'
#/home/andey/.rvm/gems/ruby-2.3.4/gems/activesupport-4.2.9/lib/active\u-support/dependencies.rb:268:in'block in load'
#/home/andey/.rvm/gems/ruby-2.3.4/gems/activesupport-4.2.9/lib/active\u support/dependencies.rb:240:in'load\u dependency'
#/home/andey/.rvm/gems/ruby-2.3.4/gems/activesupport-4.2.9/lib/active\u support/dependencies.rb:268:in'load'
#/home/andey/.rvm/gems/ruby-2.3.4/gems/railties-4.2.9/lib/rails/engine.rb:652:in'block in load_config_initializer'
#/home/andey/.rvm/gems/ruby-2.3.4/gems/activesupport-4.2.9/lib/active_-support/notifications.rb:166:in'instrument'
#/home/andey/.rvm/gems/ruby-2.3.4/gems/railties-4.2.9/lib/rails/engine.rb:651:in`load_
def self.auth(params = {})
  status = params[:status].presence || 200
  url = 'http://169.254.169.254/latest/meta-data/iam/security-credentials/'
  WebMock.stub_request(:get, url)
      .with({headers: request_headers}.compact)
      .to_return(status: status, body: 'SampleRole', headers: {})
end

def self.role_auth(role = 'SampleRole')
  url = "http://169.254.169.254/latest/meta-data/iam/security-credentials/#{role}"
  WebMock.stub_request(:get, url)
      .with({headers: request_headers}.compact)
      .to_return(status: 200, body: sample_response, headers: {})
end

private

def self.request_headers
  {
      'Accept': '*/*',
      'Accept-Encoding': 'gzip;q=1.0,deflate;q=0.6,identity;q=0.3',
      'User-Agent': 'aws-sdk-ruby3/3.21.2'
  }.with_indifferent_access
end

def self.sample_response
  {
      Code: 'Success',
      LastUpdated: '2020-05-08T05:55:23Z',
      Type: 'AWS-HMAC',
      AccessKeyId: Faker::Lorem.characters(10),
      SecretAccessKey: Faker::Lorem.characters(20),
      Token: Faker::Lorem.characters(60),
      Expiration: '2020-05-08T12:00:45Z'
  }.to_json
end

before do
 ApiStub::IamCred.auth
 ApiStub::IamCred.role_auth
end