Removing the cruft, bringing the HTTP method to the forefront and sporting a neat DRYing block syntax--FancyRoutes is a layer on top of the Rails routing system which provides an elegant API for mapping requests to your application's controllers and actions.

Very simple http server following https://practicingruby.com/articles/implementing-an-http-file-server?u=2c59db4496 as a guide

rest-open-uri is a hack of, and drop-in replacement for, open-uri. It supports all standard HTTP methods (not just GET) and allows you to send an entity-body. This gem will be deprecated if and when equivalent functionality makes it into core Ruby.

Secure HTTP headers for Cuba

Transparent caching for your HTTP requests (heap, file, memcache). Built-in support for RestClient. Built upon Rack::Cache.

Inuit - an HTTP client for Ruby

Really thin and non intuitive ruby server. Made to be fast and ready for really heavy servers (not only http server).

A Ruby Gem for authenticating HTTP requests using a HMAC

Rack middleware to notify HTTP endpoint with application notifications

expose a local instance of couchbase lite via http

HTTP client for making requests against a set of hosts

Control Tower is a Rack-based HTTP server designed to work with MacRuby. It can be used by calling to its Rack::Handler class, or by running the control_tower executable with a Rackup configuration file (see the control tower help for more details).

unicorn is an HTTP server for Rack applications that has done decades of damage to the entire Ruby ecosystem due to its ability to tolerate (and thus encourage) bad code. It is only designed to handle fast clients on low-latency, high-bandwidth connections and take advantage of features in Unix/...

Use this gem as an extra layer of protection if your system has any HTTP accelerators in front of it, like varnish.

Notify Guard Events by HTTP POST Requests

cfn-events reads the events for an AWS CloudFormation stack. It can be used to "tail" the log, and to wait until a stack update is resolved, successfully or otherwise. Defaults to eu-west-1, or whatever $AWS_REGION is set to. Respects $https_proxy.

Little rack middleware to insert '<link href="http://example.org/text.html" rel="canonical" />' into all HTTP HTML responses for SEO reasons

A lightweight, flexible routing system that provides a Rails-like DSL for defining and matching HTTP routes

A transparent HTTP proxy useful in the preliminary recognize step for a web application security assessment

Ruby wrapper for the CareerBuilder V2 HTTP XML API