允许任何通过 CORS 政策

我怎样才能使心脏停止跳动？出于某种原因，我通配了允许的起源和标题，但我的 ajax 请求仍然抱怨，起源不允许我的 CORS 政策..。

我的应用程序控制器:

class ApplicationController < ActionController::Base
protect_from_forgery
before_filter :current_user, :cors_preflight_check
after_filter :cors_set_access_control_headers


# For all responses in this controller, return the CORS access control headers.


def cors_set_access_control_headers
headers['Access-Control-Allow-Origin'] = '*'
headers['Access-Control-Allow-Methods'] = 'POST, GET, OPTIONS'
headers['Access-Control-Allow-Headers'] = '*'
headers['Access-Control-Max-Age'] = "1728000"
end


# If this is a preflight OPTIONS request, then short-circuit the
# request, return only the necessary headers and return an empty
# text/plain.


def cors_preflight_check
if request.method == :options
headers['Access-Control-Allow-Origin'] = '*'
headers['Access-Control-Allow-Methods'] = 'POST, GET, OPTIONS'
headers['Access-Control-Allow-Headers'] = '*'
headers['Access-Control-Max-Age'] = '1728000'
render :text => '', :content_type => 'text/plain'
end
end
private
# get the user currently logged in
def current_user
@current_user ||= User.find(session[:user_id]) if session[:user_id]
end
helper_method :current_user


end

路线:

  match "*all" => "application#cors_preflight_check", :constraints => { :method => "OPTIONS" }
match "/alert" => "alerts#create"
match "/alerts" => "alerts#get"
match "/login" => "sessions#create"
match "/logout" => "sessions#destroy"
match "/register" => "users#create"

编辑

我也试过:

   config.middleware.use Rack::Cors do
allow do
origins '*'
resource '*',
:headers => :any,
:methods => [:get, :post, :delete, :put, :options]
end
end

在应用。 rb

——编辑2——

我认为问题在于 Chrome 扩展可能不支持 CORS。如何绕过 CORS 获取信息？我应该如何回应飞行前检查？

120895 次浏览
小开

Have a look at the rack-cors middleware. It will handle CORS headers in a configurable manner.

小开

I have had a similar problem before where it turned out to be the web brower (chrome in my case) that was the issue.

If you are using chrome, try launching it so:

For Windows:

1) Create a shortcut to Chrome on your desktop. Right-click on the shortcut and choose Properties, then switch to “Shortcut” tab.

2) In the “Target” field, append the following: –args –disable-web-security

For Mac, Open a terminal window and run this from command-line: open ~/Applications/Google\ Chrome.app/ –args –disable-web-security

Above info from:

http://documentumcookbook.wordpress.com/2012/03/13/disable-cross-domain-javascript-security-in-chrome-for-development/

小开

I had issues, especially with Chrome as well. What you did looks essentially like what I did in my application. The only difference is that I am responding with a correct hostnames in my Origin CORS headers and not a wildcard. It seems to me that Chrome is picky with this.

Switching between development and production is a pain, so I wrote this little function which helps me in development mode and also in production mode. All of the following things happen in my application_controller.rb unless otherwise noted, it might not be the best solution, but rack-cors didn't work for me either, I can't remember why.

def add_cors_headers
origin = request.headers["Origin"]
unless (not origin.nil?) and (origin == "http://localhost" or origin.starts_with? "http://localhost:")
origin = "https://your.production-site.org"
end
headers['Access-Control-Allow-Origin'] = origin
headers['Access-Control-Allow-Methods'] = 'POST, GET, OPTIONS, PUT, DELETE'
allow_headers = request.headers["Access-Control-Request-Headers"]
if allow_headers.nil?
#shouldn't happen, but better be safe
allow_headers = 'Origin, Authorization, Accept, Content-Type'
end
headers['Access-Control-Allow-Headers'] = allow_headers
headers['Access-Control-Allow-Credentials'] = 'true'
headers['Access-Control-Max-Age'] = '1728000'
end

And then I have this little thing in my application_controller.rb because my site requires a login:

before_filter :add_cors_headers
before_filter {authenticate_user! unless request.method == "OPTIONS"}

In my routes.rb I also have this thing:

match '*path', :controller => 'application', :action => 'empty', :constraints => {:method => "OPTIONS"}

and this method looks like this:

def empty
render :nothing => true
end
小开
最佳答案

I've your same requirements on a public API for which I used rails-api.

I've also set header in a before filter. It looks like this:

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

It seems you missed the Access-Control-Request-Method header.

小开

Try configuration at /config/application.rb:

config.middleware.insert_before 0, "Rack::Cors" do
allow do
origins '*'
resource '*', :headers => :any, :methods => [:get, :post, :options, :delete, :put, :patch], credentials: true
end
end
小开

Simply you can add rack-cors gem https://rubygems.org/gems/rack-cors/versions/0.4.0

1st Step: add gem to your Gemfile: 

gem 'rack-cors', :require => 'rack/cors'

and then save and run bundle install

2nd Step: update your config/application.rb file by adding this:

config.middleware.insert_before 0, Rack::Cors do
allow do
origins '*'
resource '*', :headers => :any, :methods => [:get, :post, :options]
end
end

for more details you can go to https://github.com/cyu/rack-cors Specailly if you don't use rails 5.

小开

Just encountered with this issue in my rails application in production. A lot of answers here gave me hints and helped me to finally come to an answer that worked fine for me.

I am running Nginx and it was simple enough to just modify the my_app.conf file (where my_app is your app name). You can find this file in /etc/nginx/conf.d

If you do not have location / {} already you can just add it under server {}, then add add_header 'Access-Control-Allow-Origin' '*'; under location / {}.

The final format should look something like this:

server {
server_name ...;
listen ...;
root ...;


location / {
add_header 'Access-Control-Allow-Origin' '*';
}
}
小开

Use VSC or any other editor that has Live server, it will give you a proxy that will allow you to use GET or FETCH


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