访问控制允许来源已在Rails中设置，仍然抱怨“否”访问控制允许来源“标题存在于请求的资源中”

在Ruby on Rails API中遇到问题：我已经设置了Access-Control-Allow-Origin作为“*”在我的config/application.rb中，如下面的代码所示。但是，当我的前端向后端API发出GET或POST请求时，我会在请求的资源上出现错误“No'Access-Control-Allow-Origin'标题，因此不允许Origin'http://localhost:8888'访问。访问控制允许来源已在Rails中设置，仍然抱怨“否”访问控制允许来源“标题存在于请求的资源中”

require_relative 'boot' 

require "rails" 
# Pick the frameworks you want: 
require "active_model/railtie" 
require "active_job/railtie" 
require "active_record/railtie" 
require "action_controller/railtie" 
require "action_mailer/railtie" 
require "action_view/railtie" 
require "action_cable/engine" 
# require "sprockets/railtie" 
# require "rails/test_unit/railtie" 

# Require the gems listed in Gemfile, including any gems 
# you've limited to :test, :development, or :production. 
Bundler.require(*Rails.groups) 

module MyapplicationApi 
    class Application < Rails::Application 
    # Initialize configuration defaults for originally generated Rails version. 
    # config.load_defaults 5.1 

    # Settings in config/environments/* take precedence over those specified here. 
    # Application configuration should go into files in config/initializers 
    # -- all .rb files in that directory are automatically loaded. 

    # Only loads a smaller set of middleware suitable for API only apps. 
    # Middleware like session, flash, cookies can be added back manually. 
    # Skip views, helpers and assets when generating a new resource. 
    config.api_only = true 
    config.action_dispatch.default_headers = { 
     'Access-Control-Allow-Origin' => '*', 
     'Access-Control-Request-Method' => %w{GET POST PUT OPTIONS}.join(",") 
    } 
    end 
end

我也尝试添加以下行不果：

'Access-Control-Request-Method' => '*', 
'Access-Control-Allow-Methods' => 'POST, PUT, DELETE, GET, OPTIONS', 
'Access-Control-Allow-Headers' => 'Origin, X-Requested-With, Content-Type, Accept, Authorization'

感谢您的帮助！

来源

2017-05-09 Music Map

可能的重复：http://stackoverflow.com/questions/17858178/allow-anything-through-cors-policy –

有你的Gemfile

使用

gem 'rack-cors'

如果没有尝试添加此。它会帮助

来源

2017-05-09 12:16:47 shivashankar

非常感谢这个建议，它的工作！ –

访问控制允许来源已在Rails中设置，仍然抱怨“否”访问控制允许来源“标题存在于请求的资源中”

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