Question

Does Sinatra support the OPTIONS HTTP verb? Something like:

options '/' do
  response.headers["Access-Control-Allow-Origin"] = "*"
  response.headers["Access-Control-Allow-Methods"] = "POST"

  halt 200
end

Answer 1

After a bit of hacking I managed to get it working using:

before do
  if request.request_method == 'OPTIONS'
    response.headers["Access-Control-Allow-Origin"] = "*"
    response.headers["Access-Control-Allow-Methods"] = "POST"

    halt 200
  end
end

Edit:

After some more looking around on this issue, I realized that a PULL request is up on GitHub for the addition of the OPTIONS verb (https://github.com/sinatra/sinatra/pull/129). I took the solution and hacked it in using the following snippet:

configure do
  class << Sinatra::Base
    def options(path, opts={}, &block)
      route 'OPTIONS', path, opts, &block
    end
  end
  Sinatra::Delegator.delegate :options
end

Now I can simply use:

options '/' do
  ...
end

Edit:

The pull request should be merged. No more need for the hack.