THE FUNCTIONAL HTTP TOOLKIT FOR .NET ↗ OPEN SOURCE

Every outcome.
In view.

The network is unpredictable. Your code doesn’t have to be. Make every HTTP outcome explicit with typed results, pattern matching, and exhaustiveness checks.

Start building ↗Explore the API →

01 / THE REQUEST LAB

HTTP → RESULT<T, E>

200 OK → Your deserialized response, wrapped in a typed success.

var message = result switch
{
    OkPost(var post) => post.Title,
    ErrorPost(ResponseErrorPost(var error, var status, _)) => $"HTTP {status}",
    ErrorPost(ExceptionErrorPost(var exception)) => exception.Message
};

Interactive illustration · No requests leave your browser · Type aliases explained in the docs

02 / DESIGNED FOR THE REAL WORLD

Confidence is a type.

01 — OUTCOME

Errors become data.

Success, response errors, exceptions. Represent what happened in the return type.

Result<T, E> ↗ 02 — EXHAUSTION

Catch the missing case.

Find missing switch branches at build time. Bounded analysis reports when a hierarchy exceeds its limits.

Meet the analyzer ↗ 03 — HTTPCLIENT

Keep your HttpClient.

Extend the client you already use. Keep your handlers, connection pools, and dependency injection.

IHttpClientFactory ↗ 04 — OPENAPI

From spec to safe calls.

Turn OpenAPI specifications into typed C# clients, models, and result aliases.

Generate a client ↗ 05 — MCP

Make your API a tool.

Expose API operations through generated Model Context Protocol servers.

Explore MCP ↗ 06 — REFERENCE

Straight from the source.

Browse API signatures and XML documentation exported directly from the C# source.

Read the reference ↗

03 / FROM FIRST CALL TO PRODUCTION

One small install. A clearer way to code.

Familiar C#. Explicit outcomes. Start with one request, then build from there.

Installation guide ↗

dotnet add package RestClient.Net

using RestClient.Net;
using Urls;

var result = await httpClient.GetAsync(
    "https://api.example.com/posts/1".ToAbsoluteUrl(),
    deserializeSuccess: DeserializePost,
    deserializeError: DeserializeError
);

// All outcomes stay in the return value.
// Add your aliases and handle each branch.