load environment variables from .env or specified file.

Rack Middleware to proxy requests to a remote server. This is usefull for proxying AJAX request to remote services, thanks to @cwninja.

Parse and serialize geospatial HTTP headers.

A healthcheck interface for Sinatra and Rails framework

Rack middleware for idempotency guarantees in mutating endpoints.

Rack middleware for handling large file uploads. Integrates nicely with the Nginx upload module: http://www.grid.net.ru/nginx/upload.en.html

Rack::LTI provides LTI launch and configuration endpoints to your Rack-based application. It handles configuration, authorization, and routing. For more information about LTI, see http://www.imsglobal.org/toolsinteroperability2.cfm.

A rack middleware to output access log in ltsv format

Rack parameter validation and type coercion.

Small rack middleware to block your site from unwanted vistors. A little bit more convenient than basic auth - browser will ask you once for the password and then set a cookie to remember you - unlike the http basic auth it wont prompt you all the time.

If you are creating Rack middleware that changes the HTML response, use Rack::Plastic to get a head start. Rack::Plastic takes care of the boilerplate Rack glue so that you can focus on simply changing the HTML.

Includes {'X-Clacks-Overhead': 'GNU Terry Pratchett'} header inside any rack application. http://redd.it/2yt9j6

A simple profiler for Rack applications, only depending on ActiveSupport::Notifications

Handle race conditions in Rails JS feature tests caused by outstanding overlapping actions in your app, with rack middleware to let you wait for pending feature test actions to finish

Rack::RequestID is a Rack middleware for generating request IDs. It generates a request GUID for every request (if one was not already provided) and inserts the request ID as a response header.

Rescue Handler for Rack

Adds an extra X-REVISION header with source code revision string (git, svn, etc)

Rack middleware for serving RPC endpoints.

Serve static files from S3 via Rack

Security related HTTP headers for Rack applications