How do I remove response headers?

Many application frameworks provide the ability to remove response headers, how is this done in Grape?

I see there is stuff like version 'v1', using: :header, vendor: 'twitter', cascade: false to turn off certain headers, but I want to harden my webserver and remove them completely.

My goal is to implement the same headers that the expressJS library "helmet" uses to harden nodejs servers, but at the same time the same library removes headers for you like X-Powered-By, which in my case is added by my Passenger server, which does not provide me with the ability to remove it...

< Content-Security-Policy: default-src 'self';base-uri 'self';block-all-mixed-content;font-src 'self' https: data:;frame-ancestors 'self';img-src 'self' data:;object-src 'none';script-src 'self';script-src-attr 'none';style-src 'self' https: 'unsafe-inline';upgrade-insecure-requests
< ETag: W/"3e-DqINi7yil7BpHYD6XuyvL1LYGGo"
< Expect-CT: max-age=0
< Referrer-Policy: no-referrer
< Strict-Transport-Security: max-age=15552000; includeSubDomains
< Vary: Accept-Encoding
< X-Content-Type-Options: nosniff
< X-DNS-Prefetch-Control: off
< X-Download-Options: noopen
< X-Frame-Options: SAMEORIGIN
< X-Permitted-Cross-Domain-Policies: none
< X-XSS-Protection: 0

I see that many libraries provide the ability to remove headers, but I cant find the response variable where response headers are kept in order to edit it
for instance:

ExpressJS

app.use(function (req, res, next) {
  res.header('Pragma', 'no-cache');
  res.removeHeader('Pragma');
  next();
});

Rails

response.headers['Connection'] = 'Closed'
remove_keys = %w(X-Runtime Cache-Control Server Etag Set-Cookie)
response.headers.delete_if{|key| remove_keys.include? key}

The issue names no Grape files, tests, or entry points; start by locating how Grape builds and exposes response headers. Compare that behavior with the requested header removal and determine whether the existing response API supports it; done means the supported approach or required change is clearly established and tested.