Rewrite trailing slash in Sinatra

sinatra-trailing-slash.md

To avoid receiving an error when you attempt to access one of your routes and accidentally leave a trailing slash on the URL, you can use Rack::Rewrite to redirect the browser to the same URL without the trailing slash.

First add the gem to your Gemfile

gem 'rack-rewrite', '~> 1.5.0'

Run bundle install

Add

require 'rack/rewrite'

to config/environment.rb

Now add

use Rack::Rewrite do
  r301 %r{^/(.*)/$}, '/$1'
end

to config/environment.rb

Restart your Sinatra app and test in your browser.

It's easy to make trailing slash optional:

get '/my/path/?' do
end

But this would lead to duplicate content in search engines, because /my/path and /my/path/ ARE different URLs, so the way to go is to provide a permanent, 301 redirect.

This can be reasonably taken care of, using before filter:

before(%r{/(.+)/$}) { |path| redirect(path, 301) }

@mwakipesile:

before(%r{/(.+)/$}) { |path| redirect(path, 301) }

This would only work if the original request is a GET request, correct? If the path is associated with a POST request or something, would it fail?