Open Source HTTP Clients - Page 3
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Proxyee
HTTP proxy server,support HTTPS & websocket
Proxyee is a JAVA-written HTTP proxy server library that supports HTTP, HTTPS, and WebSocket protocols, and supports MITM (Man-in-the-middle), which can capture and tamper with HTTP, and HTTPS packets. The CA certificate (src/resources/ca.crt) from the project needs to be imported to a trusted root certificate authority. The CA certificate (src/resources/ca.crt) from the project needs to be imported to a trusted root certificate authority. You can use the CertDownIntercept interceptor to enable the web certificate download feature. -
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RestSharp
Simple REST and HTTP API Client for .NET
RestSharp is probably the most popular HTTP client library for .NET. Featuring automatic serialization and deserialization, request and response type detection, variety of authentications and other useful features, it is being used by hundreds of thousands of projects. RestSharp passed over 32 million downloads on NuGet, with average daily download count of 10,000. It's being used by many popular OSS projects, including Roslyn and Swagger. The main purpose of RestSharp is to make synchronous and asynchronous calls to remote resources over HTTP. As the name suggests, the main audience of RestSharp are developers who use REST APIs. However, RestSharp can call any API over HTTP (but not HTTP/2), as long as you have the resource URI and request parameters that you want to send comply with W3C HTTP standards. RestSharp can take care of serializing the request body to JSON or XML and deserialize the response. It can also form a valid request URI based on different parameter kinds. -
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TinyGSM
A small Arduino library for GSM modules, that just works
A small Arduino library for GSM modules that just works. This library is easy to integrate with lots of sketches that use Ethernet or WiFi. PubSubClient (MQTT), Blynk, HTTP Client, and File Download examples are provided. Arduino GSM library uses 15868 bytes (49%) of Flash and 1113 bytes (54%) of RAM in a similar scenario. TinyGSM also pulls data gently from the modem (whenever possible), so it can operate on very little RAM. Now, you have more space for your experiments. TCP (HTTP, MQTT, Blynk, ...) All modules support TCP connections. Most modules support multiple simultaneous connections. TCP and SSL connections can usually be mixed up to the total number of possible connections. Many GSM modems, WiFi, and radio modules can be controlled by sending AT commands over Serial. TinyGSM knows which commands to send, and how to handle AT responses, and wraps that into the standard Arduino Client interface. -
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Titanium Web Proxy
A cross-platform asynchronous HTTP(S) proxy server in C#
A lightweight HTTP(S) proxy server written in C#. For programming help use StackOverflow with the tag Titanium-Web-Proxy. API Documentation and Wiki/Contribution guidelines. Multithreaded and asynchronous proxy employing server connection pooling, certificate cache, and buffer pooling. View, modify, redirect and block requests or responses. Supports mutual SSL authentication, proxy authentication & automatic upstream proxy detection. Supports kerberos, NTLM authentication over HTTP protocols on Windows domain-controlled networks. SOCKS4/5 Proxy support. Refer the HTTP Proxy Server library in your project and look up the test project to learn usage. -
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plow
A high-performance HTTP benchmarking tool
Plow is an HTTP(S) benchmarking tool, written in Golang. It uses excellent fast HTTP instead of Go's default net/http due to its lightning-fast performance. Plow runs at specified connections (option -c) concurrently and real-time records summary statistics, histogram of execution time and calculates percentiles to display on Web UI and terminal. It can run for a set duration( option -d), for a fixed number of requests(option -n), or until Ctrl-C is interrupted. The implementation of real-time computing Histograms and Quantiles using stream-based algorithms inspired by Prometheus with low memory and CPU bounds. so it's almost no additional performance overhead for benchmarking. -
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r2
HTTP client, spiritual successor to request
Early in Node.js I wrote an HTTP client library called request. It evolved along with Node.js and eventually became very widely depended upon. A lot has changed since 2010 and I've decided to re-think what a simple HTTP client library should look like. This new library, r2, is a completely new approach from request. Rather than being built on top of the Node.js Core HTTP library and shimmed for the browser, r2 is built on top of the browser's Fetch API and shimmed for Node.js. APIs are meant to be used with async/await, which means they are based on promises. Being written to the Fetch API is a huge benefit for browser users. When running through browserify request is ~2M uncompressed and ~500K compressed. r2 is only 66K uncompressed and 16K compressed. -
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Echo HTML Viewer
Fast offline HTML viewer for opening local HTML files on Windows
Echo HTML Viewer is a lightweight desktop app for viewing local HTML files without a browser or internet connection. Designed for simplicity and privacy, it lets you open saved web pages, documentation, and archived content in a clean, distraction-free interface. Key features: • Open HTML files instantly • Drag & drop support • Fast startup and low resource usage • Fully offline — no telemetry, no tracking • No background services Use cases: • View saved websites offline • Read HTML documentation • Preview local HTML files quickly FREE version includes core functionality. 🚀 PRO version available: Upgrade directly inside the app using the built-in “Unlock PRO” button. © 2026 Echo Technology -
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Coraza
OWASP Coraza WAF is a golang modsecurity compatible firewall library
Coraza is an open-source, enterprise-grade, high-performance Web Application Firewall (WAF) ready to protect your beloved applications. It is written in Go, supports ModSecurity SecLang rulesets and is 100% compatible with the OWASP Core Rule Set. Coraza is a drop-in alternative to replace the soon-to-be abandoned Trustwave ModSecurity Engine and supports industry-standard SecLang rule sets. Coraza runs the OWASP Core Rule Set (CRS) to protect your web applications from a wide range of attacks, including the OWASP Top Ten, with a minimum of false alerts. CRS protects from many common attack categories including: SQL Injection (SQLi), Cross Site Scripting (XSS), PHP & Java Code Injection, HTTPoxy, Shellshock, Scripting/Scanner/Bot Detection & Metadata & Error Leakages. Coraza is a library at its core, with many integrations to deploy on-premise Web Application Firewall instances. -
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Drill
Drill is an HTTP load testing application written in Rust
Drill is an HTTP load-testing application written in Rust. The main goal for this project is to build a really lightweight tool as an alternative to other that require JVM and other stuff. You can write benchmark files, in YAML format, describing all the stuff you want to test. It was inspired by Ansible syntax because it is really easy to use and extend. As you can see, you can play with interpolations in different ways. This will let you specify a benchmark with different requests and dependencies between them. Right now, the easiest way to get drill is to go to the latest release page and download the binary file for your platform. OpenSSL is needed in order to compile Drill, whether it is through cargo install or when compiling from source with cargo build. -
JS7 JobScheduler is an open source workload automation solution.JS7 JobScheduler is an open source workload automation solution. It is used to run executable files, shell scripts etc. and database procedures.
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Ktorfit
HTTP client generator / KSP plugin for Kotlin Multiplatform
Ktorfit is a HTTP client/Kotlin Symbol Processor for Kotlin Multiplatform (Android, iOS, Js, Jvm, Linux) using KSP and Ktor clients inspired by Retrofit. -
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Laravel Webhook Server
Send webhooks from Laravel apps
A webhook is a mechanism where an application can notify another application that something has happened. Technically, the application sends an HTTP request to that other application. In this blog post, I'd like to introduce you to two packages that we recently released. The first is laravel-webhook-server, which allows you to send webhook requests. The second one is laravel-webhook-client, which makes it easy to receive those webhook request. Webhooks are very useful when a system wants to be notified as soon as something happens in another system. Let's make that a bit less abstract and take a look at a real-world example. laravel-webhook-server allows you to configure and send webhooks in a Laravel app easily. So you'll install this into the app that wants to notify other apps that something has happened. The package has support for signing calls, retrying calls, and backoff strategies. -
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OwnTracks for Android
OwnTracks Android App
OwnTracks allows you to keep track of your own location. You can build your private location diary or share it with your family and friends. OwnTracks is open-source and uses open protocols for communication so you can be sure your data stays secure and private. This is the OwnTracks Android app. See our booklet for details on how to get started with OwnTracks, as well some details about behaviour specific to the Android app. -
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Parallec
Fast Parallel Async HTTP/SSH/TCP/UDP/Ping Client Java Library
Fast parallel async HTTP/SSH/TCP/UDP/Ping client java library on Akka. Aggregate 100,000 APIs & send results anywhere in 20 lines of code. View production use cases. Ping or HTTP calls 8000 servers with responses aggregated in 12 seconds. Parallec means Parallel Client (pronounced as "para-like"). Open Source from eBay Cloud. A convenient response context passes any object you need when handling a response. Process data anyway and send it anywhere. Intuitive builder pattern APIs make parallel requests exceedingly easy. Input target hosts from list, string, text, json path, and cms query from local or URLs. Auto progress polling to handle async APIs such as "download packages" or "create compute", enabling task-level concurrency control and orchestration. Infinite scalability with flexible task-level concurrency control without creating 1,000 threads thread pools. Ping / HTTP 8,000 servers with response aggregation in 12 seconds. -
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Promxy
An aggregating proxy to enable HA prometheus
Promxy is a prometheus proxy that makes many shards of prometheus appear as a single API endpoint to the user. This significantly simplifies operations and use of prometheus at scale (when you have more than one prometheus host). Promxy delivers this unified access endpoint without requiring any sidecars, custom-builds, or other changes to your prometheus infrastructure. Prometheus itself provides no real HA/clustering support. As such the best-practice is to run multiple (e.g N) hosts with the same config. Similarly prometheus has no real built-in query federation, which means that you end up with N sources in grafana which is (1) confusing to grafana users and (2) has no support for aggregation across the sources. Promxy enables an HA prometheus setup by "merging" the data from the duplicate hosts (so if there is a gap in one, promxy will fill with the other). In addition Promxy provides a single datasource for all promql queries. -
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Retrofit For Dart
Retrofit.dart is an dio client generator using source_gen
retrofit.dart is a type conversion dio client generator using source_gen and inspired by Chopper and Retrofit. If you want to parse models on a separate thread, you can take advantage of the compute function, just like Dio does when converting String data responses into json objects. Avoid using Map values, otherwise, multiple background isolates will be spawned to perform the computation, which is extremely intensive for Dart. -
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Trafexia
Mobile Traffic Interceptor
Trafexia is a lightweight web application designed to visualize real-time and historical transportation data, such as traffic flows, transit schedules, or route usage, with clean dashboards and map overlays that help users and analysts interpret mobility patterns quickly. It integrates data streams from APIs, CSV feeds, or sensor inputs and processes them into intuitive visualizations including flow diagrams, heatmaps, time series charts, and route performance boards. The UI balances rich visuals with clarity, enabling quick switches between granular road-level insights and broader corridor analytics without overwhelming the viewer. It also supports filtering by time ranges, vehicle types, or geographic zones so analysts can drill into peak congestion periods or specific transit routes. -
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WebLink Component
Manages links between resources
The WebLink component manages links between resources. It is particularly useful to advise clients to preload and prefetch documents through HTTP and HTTP/2 pushes. This component implements the HTML5's Links, Preload and Resource Hints W3C's specifications. It can also be used with extensions defined in the HTML5 link type extensions wiki. -
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WireMock.Net
WireMock.Net is a product for stubbing and mocking web HTTP responses
Free and Open Source tool for building mock APIs. Create stable development environments, isolate yourself from flakey 3rd parties and simulate APIs that don't exist yet. WireMock frees you from dependency on unstable APIs and allows you to develop with confidence. It's easy to launch a mock API server and simulate a host of real-world scenarios and APIs - including REST, SOAP, OAuth2 and more. WireMock is a free API mocking tool that can be run as a standalone server, or in a hosted version via the WireMock Cloud-managed service. API mocking involves creating a simple simulation of an API, accepting the same types of request and returning identically structured responses as the real thing, enabling fast and reliable development and testing. -
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kohttp
Kotlin DSL http client
Kotlin DSL HTTP client. -
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req
Simple Go HTTP client with Black Magic
Simple and easy to use, providing rich client-level and request-level settings, all of which are intuitive and chainable methods. Provides powerful and convenient debug utilities, including debug logs, performance traces, and even dump the complete request and response content. API testing can be done with minimal code, no need to explicitly create any Request or Client, or even to handle errors. Detect and decode to utf-8 automatically if possible to avoid garbled characters (See Auto Decode), marshal request body and unmarshal response body automatically according to the Content-Type. Req support HTTP/1.1, HTTP/2, and HTTP/3, and can automatically detect the server side and select the optimal HTTP version for requests, you can also force the protocol if you want. Support automatic request retry and is fully customizable. -
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reqwest
An easy and powerful Rust HTTP Client
The reqwest crate provides a convenient, higher-level HTTP client. It handles many of the things that most people just expect an HTTP client to do for them. The reqwest::Client is asynchronous. For applications wishing to only make a few HTTP requests, the reqwest::blocking API may be more convenient. There are several ways you can set the body of a request. The basic one is by using the body() method of a RequestBuilder. This lets you set the exact raw bytes of what the body should be. -
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POCO C++ Libraries
Cross-platform C++ libraries with a network/internet focus.
NOTE: Current source code as well as bugs/patches are on GitHub: https://github.com/pocoproject/poco/ C++ class libraries for network-centric, portable applications, integrated perfectly with the C++ Standard Library. Includes network protocols (Sockets, HTTP, FTP, SMTP, POP3, etc.), SQL database access and XML parsing. Licensed under Boost license. -
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JETTY HAS MOVED TO ECLIPSE!!!! The latest releases of Jetty are hosted from http://eclipse.org/jetty. Jetty is an open-source project providing a HTTP server, HTTP client and javax.servlet container.
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Guzzle
An extensible PHP HTTP client
Guzzle is a PHP HTTP client that makes it easy to send HTTP requests and trivial to integrate with web services. Simple interface for building query strings, POST requests, streaming large uploads, streaming large downloads, using HTTP cookies, uploading JSON data, etc... Can send both synchronous and asynchronous requests using the same interface. Uses PSR-7 interfaces for requests, responses, and streams. This allows you to utilize other PSR-7 compatible libraries with Guzzle. Abstracts away the underlying HTTP transport, allowing you to write environment and transport agnostic code; i.e., no hard dependency on cURL, PHP streams, sockets, or non-blocking event loops. Middleware system allows you to augment and compose client behavior. -
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HTTPoison
Yet Another HTTP client for Elixir powered by hackney
HTTP client for Elixir, based on HTTPotion. HTTPoison uses hackney to execute HTTP requests instead of ibrowse. Using hackney we work only with binaries instead of string lists. First, add HTTPoison to your mix.exs dependencies. Add :httpoison to your applications list if your Elixir version is 1.3 or lower. You can also easily pattern match on the HTTPoison.Response struct. There are a number of supported options(not to be confused with the HTTP options method), documented here, that can be added to your request. The example below shows the use of the :ssl and :recv_timeout options for a post request to an api that requires a bearer token. The :ssl option allows you to set options accepted by the Erlang SSL module, and :recv_timeout sets a timeout on receiving a response, the default is 5000ms.
