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

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


Requests allows you to send organic, grass-fed HTTP/1.1 requests, without the need for manual labor. There's no need to manually add query strings to your URLs, or to form-encode your POST data. Keep-alive and HTTP connection pooling are 100% automatic, thanks to urllib3. Requests is one of the most downloaded Python packages of all time, pulling in over 11,000,000 downloads every month. 
 
<ul>
<li>International Domains and URLs</li>
<li>Keep-Alive &amp; Connection Pooling</li>
<li>Sessions with Cookie Persistence</li>
<li>Browser-style SSL Verification</li>
<li>Basic/Digest Authentication</li>
<li>Elegant Key/Value Cookies</li>
<li>Automatic Decompression</li>
<li>Automatic Content Decoding</li>
<li>Unicode Response Bodies</li>
<li>Multipart File Uploads</li>
<li>HTTP(S) Proxy Support</li>
<li>Connection Timeouts</li>
<li>Streaming Downloads</li>
<li><code>.netrc</code> Support</li>
<li>Chunked Requests</li>
</ul>

Requests allows you to send organic, grass-fed HTTP/1.1 requests, without the need for manual labor. There's no need to manually add query strings to your URLs, or to form-encode your POST data. Keep-alive and HTTP connection pooling are 100% automatic, thanks to urllib3. Requests is one of the most downloaded Python packages of all time, pulling in over 11,000,000 downloads every month. 

Requests - Python HTTP Requests for Humans

HTTPie (pronounced aitch-tee-tee-pie) is a command line HTTP client. Its goal is to make CLI interaction with web services as human-friendly as possible. It provides a simple http command that allows for sending arbitrary HTTP requests using a simple and natural syntax, and displays colorized output. HTTPie can be used for testing, debugging, and generally interacting with HTTP servers.

HTTPie - a CLI, cURL-like tool for humans

The Akka HTTP modules implement a full server- and client-side HTTP stack on top of akka-actor and akka-stream. It's not a web-framework but rather a more general toolkit for providing and consuming HTTP-based services. While interaction with a browser is of course also in scope it is not the primary focus of Akka HTTP. 
 
Akka HTTP follows a rather open design and many times offers several different API levels for "doing the same thing". You get to pick the API level of abstraction that is most suitable for your application. This means that, if you have trouble achieving something using a high-level API, there's a good chance that you can get it done with a low-level API, which offers more flexibility but might require you to write more application code.

The Akka HTTP modules implement a full server- and client-side HTTP stack on top of akka-actor and akka-stream. It's not a web-framework but rather a more general toolkit for providing and consuming HTTP-based services. While interaction with a browser is of course also in scope it is not the primary focus of Akka HTTP. 

Akka HTTP - The Streaming-first HTTP server/module of Akka

SuperAgent is light-weight progressive ajax API crafted for flexibility, readability, and a low learning curve after being frustrated with many of the existing request APIs. 

superagent - Ajax for Node.js and browsers (JS HTTP client)

Guzzle is a PHP HTTP client that makes it easy to send HTTP requests and trivial to integrate with web services. It can do both  synchronous and asynchronous requests using the same interface, It supports simple interface for building query strings, POST requests, streaming large uploads, streaming large downloads, using HTTP cookies, uploading JSON data, etc, Uses PSR-7 interfaces for requests, responses, and streams.

Guzzle - an extensible PHP HTTP client

A fast and correct HTTP implementation for Rust. It supports both HTTP/1 and HTTP/2. It is a relatively low-level library, meant to be a building block for libraries and applications. It supports high concurrency with non-blocking sockets.

hyper - An HTTP library for Rust

The serf library is a C-based HTTP client library built upon the Apache Portable Runtime (APR) library. It multiplexes connections, running the read/write communication asynchronously. Memory copies and transformations are kept to a minimum to provide high performance operation. serf 1.0.x is the default client library of Apache Subversion

Apache Serf - High-performance asynchronous HTTP client library

Retrofict is a type-safe HTTP client for Android and Java. It uses annotations to describe the HTTP request. It supports multipart request body, file upload, Object conversion to request body (e.g., JSON, protocol buffers).


retrofit - Type-safe REST client for Android and Java

http4k is an HTTP toolkit written in Kotlin that enables the serving and consuming of HTTP services in a functional and consistent way. It consists of a core library http4k-core providing a base HTTP implementation + a number of abstractions for various functionalities (such as servers, clients, templating etc) that are provided as optional add-on libraries.
 
http4k apps can be simply mounted into a running Server, Serverless platform, or compiled to GraalVM and run as a super-lightweight binary. In a single line of code you can switch your server between Java (built-in), Apache, Jetty, Netty, Undertow, Ktor, or Ratpack. In a single line of code you can also switch your client implementation between Java (built-in), Apache, Jetty, and OkHttp.

http4k is an HTTP toolkit written in Kotlin that enables the serving and consuming of HTTP services in a functional and consistent way. It consists of a core library http4k-core providing a base HTTP implementation + a number of abstractions for various functionalities (such as servers, clients, templating etc) that are provided as optional add-on libraries.

http4k - HTTP toolkit written in Kotlin that enables the serving and consuming of HTTP services in a functional and consistent way

An ergonomic HTTP Client for Rust. Built on top of hyper, with a batteries-included mindset. It supports HTTPS via system-native TLS (or optionally, rustls), Customizable redirect policy, HTTP Proxies, Plain bodies, JSON, urlencoded, multipart, WASM, Cookie Store.

reqwest - An easy and powerful Rust HTTP Client

Postman is a powerful HTTP client to help test web services easily and efficiently. Postman let's you craft simple as well as complex HTTP requests quickly. It also saves requests for future use so that you never have to repeat your keystrokes ever again.

Postman - A chrome addon, helps to test web services

urllib3 is a powerful, sanity-friendly HTTP client for Python. Much of the Python ecosystem already uses urllib3 and you should too. urllib3 brings many critical features that are missing from the Python standard libraries:
<ul>
<li>Thread safety.</li>
<li>Connection pooling.</li>
<li>Client-side SSL/TLS verification.</li>
<li>File uploads with multipart encoding.</li>
<li>Helpers for retrying requests and dealing with HTTP redirects.</li>
<li>Support for gzip and deflate encoding.</li>
<li>Proxy support for HTTP and SOCKS.</li>
<li>100% test coverage.</li>
</ul>

urllib3 is a powerful, sanity-friendly HTTP client for Python. Much of the Python ecosystem already uses urllib3 and you should too. urllib3 brings many critical features that are missing from the Python standard libraries:

urllib3 - Python HTTP library with thread-safe connection pooling, file post support, sanity friendly, and more

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