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.
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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

Heimdall is an HTTP client that helps your application make a large number of requests, at scale. With Heimdall, you can use a hystrix-like circuit breaker to control failing requests, Add synchronous in-memory retries to each request, with the option of setting your own retrier strategy, Create clients with different timeouts for every request.

Heimdall - An enhanced HTTP client for Go

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

The project aims to build upon the latest C++ standard (currently C++11) to provide easy to use libraries for network programming. We use the latest compiler versions and features with an eye on pushing the boundaries on leveraging what's available in C++. Currently the library contains an HTTP client and server implementation, a stand-alone URI library, a network message framework, and some concurrency tools.

cpp-netlib - The C++ Network Library Project

Http4s is a minimal, idiomatic Scala interface for HTTP services. Http4s is Scala's answer to Ruby's Rack, Python's WSGI, Haskell's WAI, and Java's Servlets.

http4s -  A typeful, purely functional, streaming library for HTTP clients and servers in Scala

phin is trusted by some really important projects. The hundreds of contributors at Less, for example, depend on phin as part of their development process.Also, phin is super lightweight. Like 99.6% smaller than request lightweight.

Phin - The ultra-lightweight Node.js HTTP client

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