Riot + HTTParty smoke testing framework. You'd use it for integration testing with real HTTP requests and responses

An HTTP client designed for use with JRuby in a threaded environment

helps cut through the clutter of HTTP testing

A configurable and extensible, HTTP proxy and capture library, implementing the BrowserMob Proxy REST api.

HttpMe

A library for translating HTTP request and response objects for various clients into a common representation.

As seen here http://httpstatusdogs.com/

Allows you to specify http status codes by name rather than magic numbers for more readable code. Go to https://github.com/MishaConway/httpcode for detailed examples.

Simple HTTP-client for https://reindexer.io/

Adds some extra utilities to make verifying your HTTParty responses more convienent and fun

Makes http fun! Also, makes consuming restful web services dead easy. This is the DNC Labs fork.

A Ruby library that for LY.com's HTTP-based hotel API.

RightScale's robust HTTP/S connection module

HTTP sever for directory index with extra features

New Relic instrumentation for http.rb

Wrapper for IO to upload to web server

Pure Ruby Driver and Utilitity with Http-server for the Ultra Cheap Radio Chip nRF24

RSpec extension for HTTP request

Animo allows building scalable Ruby web services. It emphasizes a distinct separation of the Core Domain, HTTP-related code, and message consumption logic.

Client library that simplifies making and logging HTTP requests and responses. This library is built as an abstraction on top of the Faraday ruby client.