Unicorn is an HTTP server for Rack applications designed to only serve fast clients on low-latency, high-bandwidth connections and take advantage of features in Unix/Unix-like kernels. Load balancing is done entirely by the operating system kernel. Requests never pile up behind a busy worker process. Does not care if your application is thread-safe or not, workers all run within their own isolated address space and only serve one client at a time for maximum robustness.



Unicorn - Rack HTTP server for fast clients and Unix

OkHttp is an HTTP & HTTP/2 client for Android and Java applications. It provides HTTP/2 support allows all requests to the same host to share a socket, Connection pooling, Response caching and lot more.

OkHttp -  An HTTP & HTTP/2 client for Android and Java applications

chi is a lightweight, idiomatic and composable router for building Go 1.7+ HTTP services. It's especially good at helping you write large REST API services that are kept maintainable as your project grows and changes. chi is built on the new context package introduced in Go 1.7 to handle signaling, cancelation and request-scoped values across a handler chain. 
The focus of the project has been to seek out an elegant and comfortable design for writing REST API servers, written during the development of the Pressly API service that powers our public API service, which in turn powers all of our client-side applications.

chi is a lightweight, idiomatic and composable router for building Go 1.7+ HTTP services. It's especially good at helping you write large REST API services that are kept maintainable as your project grows and changes. chi is built on the new context package introduced in Go 1.7 to handle signaling, cancelation and request-scoped values across a handler chain.

chi - Lightweight, idiomatic and composable router for building Go HTTP services

Fast HTTP implementation for Go.Currently fasthttp is successfully used by VertaMedia in a production serving up to 200K rps from more than 1.5M concurrent keep-alive connections per physical server. fasthttp server is up to 10 times faster than net/http.

fasthttp - Fast HTTP package for Go

Martini is a powerful package for quickly writing modular web applications/services in Golang. It is extremely simple to use, Awesome path matching and routing, 
Modular design - Easy to add functionality, easy to rip stuff out, Lots of good handlers/middlewares to use and lot more.

Martini - Classy web framework for Go

curl is used in command lines or scripts to transfer data. It is also used in cars, television sets, routers, printers, audio equipment, mobile phones, tablets, settop boxes, media players and is the internet transfer backbone for thousands of software applications affecting billions of humans daily. 
 
It supports DICT, FILE, FTP, FTPS, Gopher, HTTP, HTTPS, IMAP, IMAPS, LDAP, LDAPS, POP3, POP3S, RTMP, RTSP, SCP, SFTP, SMB, SMBS, SMTP, SMTPS, Telnet and TFTP. curl supports SSL certificates, HTTP POST, HTTP PUT, FTP uploading, HTTP form based upload, proxies, HTTP/2, cookies, user+password authentication (Basic, Plain, Digest, CRAM-MD5, NTLM, Negotiate and Kerberos), file transfer resume, proxy tunneling and more.

curl is used in command lines or scripts to transfer data. It is also used in cars, television sets, routers, printers, audio equipment, mobile phones, tablets, settop boxes, media players and is the internet transfer backbone for thousands of software applications affecting billions of humans daily. 

curl - A command line tool and library for transferring data with URL syntax, supporting HTTP, HTTPS, FTP, FTPS, GOPHER, TFTP, SCP, SFTP, SMB, TELNET, DICT, LDAP, LDAPS, FILE, IMAP, SMTP, POP3, RTSP and RTMP

Oboe.js is an open source Javascript library for loading JSON using streaming, combining the convenience of DOM with the speed and fluidity of SAX. It can parse any JSON as a stream, is small enough to be a micro-library, doesn't have dependencies, and doesn't care which other libraries you need it to speak to.

oboe.js - A streaming approach to JSON. 

WireMock is a simulator for HTTP-based APIs. Some might consider it a service virtualization tool or a mock server. It enables you to stay productive when an API you depend on doesn't exist or isn't complete. It supports testing of edge cases and failure modes that the real API won't reliably produce. And because it's fast it can reduce your build time from hours down to minutes.
 
It supports HTTP response stubbing, matchable on URL, header and body content patterns, Request verification, Fault injection, Per-request conditional proxying, Configurable via a fluent Java API, JSON files and JSON over HTTP and lot more.

WireMock is a simulator for HTTP-based APIs. Some might consider it a service virtualization tool or a mock server. It enables you to stay productive when an API you depend on doesn't exist or isn't complete. It supports testing of edge cases and failure modes that the real API won't reliably produce. And because it's fast it can reduce your build time from hours down to minutes. 



Wiremock - A tool for mocking HTTP services

 Restbed is a comprehensive and consistent programming model for building applications that require seamless and secure communication over HTTP, with the ability to model a range of business processes, designed to target mobile, tablet, desktop and embedded production environments. More in-depth examples can be found here. 

RestBed - Asynchronous RESTful functionality to C++11 applications

Drogon is a C++14/17-based HTTP application framework. Drogon can be used to easily build various types of web application server programs using C++.It uses Use a non-blocking I/O network lib based on epoll high-concurrency, high-performance network IO, Completely asynchronous programming mode, HTTPS, WebSocket, Json format, gzip, brotli compression and lot more.

Drogon - C++14/17 based HTTP Web Application Framework

aria2 is a lightweight multi-protocol & multi-source command-line download utility. It supports HTTP/HTTPS, FTP, SFTP, BitTorrent and Metalink. aria2 can be manipulated via built-in JSON-RPC and XML-RPC interfaces. It has full featured BitTorrent Client features like DHT, PEX, Encryption, Magnet URI, Web-Seeding, Selective Downloads, Local Peer Discovery and UDP tracker. 

aria2 - The ultra fast download utility

Apache web server is most popular and widely used web servers. Its features could be extended using modules. mod_proxy is a proxy module, mod_ssl provides ssl support, mod_rewrite provides URL rewriting etc. Virtual hosting is supported. Multiple websites could be accessed from single web server.

Apache Web Server - Most popular web server on the Internet

Polly.JS is a standalone, framework-agnostic JavaScript library that enables recording, replaying, and stubbing of HTTP interactions. By tapping into multiple request APIs across both Node & the browser, Polly.JS is able to mock requests and responses with little to no configuration while giving you the ability to take full control of each request with a simple, powerful, and intuitive API.
 
It helps to record your test suite's HTTP interactions and replay them during future test runs for fast, deterministic, accurate tests. You can use Polly's client-side server to modify or intercept requests and responses to simulate different application states (e.g. loading, error, etc.).

Polly.JS is a standalone, framework-agnostic JavaScript library that enables recording, replaying, and stubbing of HTTP interactions. By tapping into multiple request APIs across both Node & the browser, Polly.JS is able to mock requests and responses with little to no configuration while giving you the ability to take full control of each request with a simple, powerful, and intuitive API.

Polly.JS - Record, Replay, and Stub HTTP Interactions

Armeria is your go-to microservice framework for any situation. You can build any type of microservice leveraging your favorite technologies, including gRPC, Thrift, Kotlin, Retrofit, Reactive Streams, Spring Boot and Dropwizard. Armeria is capable of running services using different protocols, all on a single port. No need for any proxies or sidecars.
 
Armeria's documentation service allows you to browse the complete list of services and their documentation from a web browser. It provides various service discovery mechanisms, from Kubernetes-style DNS records to ZooKeeper data nodes.
 
Armeria is from the creator of <a href="https://netty.io/">Netty</a>&nbsp;and his colleagues at <a href="https://engineering.linecorp.com/en/">LINE</a>

Armeria is your go-to microservice framework for any situation. You can build any type of microservice leveraging your favorite technologies, including gRPC, Thrift, Kotlin, Retrofit, Reactive Streams, Spring Boot and Dropwizard. Armeria is capable of running services using different protocols, all on a single port. No need for any proxies or sidecars.

Armeria - Build any type of microservice leveraging your favorite technologies, including gRPC, Thrift, Kotlin, Retrofit, Reactive Streams, Spring Boot and Dropwizard

Human-friendly and powerful HTTP request library for Node.js. It is almost API compatible with the browser fetch API. It supports Promise API, Stream API, HTTPS/2 support, Progress events and Hooks.

GOT - Human-friendly and powerful HTTP request library for Node.js


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