Open Source C# HTTP Clients

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.

Indexes open directories listings in 130+ supported formats, including FTP(S), Google Drive, Bhadoo, GoIndex, Go2Index (alternatives), Dropbox, Mediafire, GoFile, GitHub. Written in C# with .NET (Core), which means it is cross-platform! Downloading is not (yet) implemented, but is already possible when you use the resulting file into another tool (for most of the formats). When you are NOT using the self-contained releases, you need to install the latest/current Runtime version of .NET 7.

The OpenAPI.NET SDK contains a useful object model for OpenAPI documents in .NET along with common serializers to extract raw OpenAPI JSON and YAML documents from the model. The OpenAPI.NET project holds the base object model for representing OpenAPI documents as .NET objects. Some developers have found the need to write processors that convert other data formats into this OpenAPI.NET object model. We'd like to curate that list of processors in this section of the readme. Converts standard .NET annotations ( /// comments ) emitted from your build (MSBuild.exe) into OpenAPI.NET document object. Converts the XML representation of the Entity Data Model (EDM) describing an OData Service into OpenAPI.NET document object.

Flurl is a modern, fluent, asynchronous, testable, portable, buzzword-laden URL builder and HTTP client library. Flurl is available on NuGet and is free for commercial use. It runs on a wide variety of platforms, including .NET Framework, .NET Core, Xamarin, and UWP. For just the URL builder, install Flurl. For everything else, install Flurl. You've come to the right place. Check out the docs. For programming question related to Flurl, please ask on Stack Overflow. Builder methods and their overloads are highly discoverable, intuitive, and always chainable. A few destructive methods are also included, such as RemoveQueryParam, RemovePathSegment, and ResetToRoot. Although similar to the parsing capabilities of System.Uri, Flurl aims to be more compliant with RFC 3986, and more true to the actual string provided.

Ultra fast and low latency asynchronous socket server & client C# .NET Core library with support TCP, SSL, UDP, Unix Domain Socket, HTTP, HTTPS, WebSocket protocols and 10K connections problem solution. Has an integration with high-level message protocol based on Fast Binary Encoding. Cross-platform (Linux, MacOS, Windows) Asynchronous communication. Supported transport protocols: TCP, SSL, UDP, UDP multicast, Unix Domain Socket. Supported Web protocols: HTTP, HTTPS, WebSocket, WebSocket secure. Supported Swagger OpenAPI iterative documentation. Supported message protocol based on Fast Binary Encoding.

This project contains an implementation of the LiveJournal/DreamWidth API (which will eventually become a Nuget package) and several small utilities (tag transfer, link translation from LJ to DW, etc.). The API implementation works on .NET Framework (>= 4.5), .NET Standard (>= 2.0) and .NET (>= 6.0) platforms.

A Promise-based REST and HTTP client for Unity. Works out of the box. Make HTTP requests from Unity. Supports HTTPS/SSL. Built on top of UnityWebRequest system. Transform request and response data (JSON serialization with JsonUtility or other tools) Automatic transforms for JSON Arrays. Supports default HTTP Methods (GET, POST, PUT, DELETE, HEAD, PATCH) Generic REQUEST method to create any http request. Based on Promises for better asynchronous programming. Learn about Promises here! Utility to work during a scene transition. Handle HTTP exceptions and retry requests easily.

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.

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.