FsHttp 11.0.0

.NET 6.0 .NET Standard 2.0
dotnet add package FsHttp --version 11.0.0
NuGet\Install-Package FsHttp -Version 11.0.0
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package.
<PackageReference Include="FsHttp" Version="11.0.0" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add FsHttp --version 11.0.0
#r "nuget: FsHttp, 11.0.0"
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package.
// Install FsHttp as a Cake Addin
#addin nuget:?package=FsHttp&version=11.0.0

// Install FsHttp as a Cake Tool
#tool nuget:?package=FsHttp&version=11.0.0


FsHttp is a .Net HTTP client library for C# and F#. It aims for describing and executing HTTP requests in convenient ways that can be used in production and interactive environments.

The design principle behind FsHttp is:

Specify common HTTP requests in a most convenient and readable way, while still being able to access the underlying .Net Http representations for covering unusual cases.

FsHttp is authored by @ronaldschlenker. Feel free to leave a message.

NuGet Badge build status


Please see FsHttp Documentation site for a detailed documentation.

A Simple Example

An example in F#:

#r "nuget: FsHttp"

open FsHttp

http {
    POST "https://reqres.in/api/users"
    CacheControl "no-cache"
            name = "morpheus"
            job = "leader"
|> Request.send

An example in C#:

#r "nuget: FsHttp"

using FsHttp.CSharp;

await "https://reqres.in/api/users".Post()
            name = "morpheus",
            job = "leader"

Migrating to new versions

For different upgrade paths, please read the Migrations section in the docu.


.Net SDK:

You need to have the latest .Net SDK installed, which is specified in ./global.json.

Build Tasks

There is a F# build script (./build.fsx) that can be used to perform several build tasks from command line.

For common tasks, there are powershell files located in the repo root:

  • ./test.ps1: Runs all tests (sources in ./src/Tests).
    • You can pass args to this task. E.g. for executing only some tests: ./test.ps1 --filter Name~'Response Decompression'
  • ./docu.ps1: Rebuilds the FsHttp documentation site (sources in ./src/docs; output goes to ./docs).
  • ./docu-watch.ps1: Run it if you are working on the documentation sources, and want to see the result in a browser.
  • ./publish.ps1: Publishes all packages (FsHttp and it's integration packages for Newtonsoft and FSharp.Data) to NuGet.
    • Always have a look at ./src/Directory.Build.props and keep the file up-to-date.


  • Parts of the code is taken from the HTTP utilities of FSharp.Data.
  • Credits to all critics, supporters, contributors, promoters, users, and friends.
Product Compatible and additional computed target framework versions.
.NET net5.0 was computed.  net5.0-windows was computed.  net6.0 is compatible.  net6.0-android was computed.  net6.0-ios was computed.  net6.0-maccatalyst was computed.  net6.0-macos was computed.  net6.0-tvos was computed.  net6.0-windows was computed.  net7.0 is compatible.  net7.0-android was computed.  net7.0-ios was computed.  net7.0-maccatalyst was computed.  net7.0-macos was computed.  net7.0-tvos was computed.  net7.0-windows was computed. 
.NET Core netcoreapp2.0 was computed.  netcoreapp2.1 was computed.  netcoreapp2.2 was computed.  netcoreapp3.0 was computed.  netcoreapp3.1 was computed. 
.NET Standard netstandard2.0 is compatible.  netstandard2.1 is compatible. 
.NET Framework net461 was computed.  net462 was computed.  net463 was computed.  net47 was computed.  net471 was computed.  net472 was computed.  net48 was computed.  net481 was computed. 
MonoAndroid monoandroid was computed. 
MonoMac monomac was computed. 
MonoTouch monotouch was computed. 
Tizen tizen40 was computed.  tizen60 was computed. 
Xamarin.iOS xamarinios was computed. 
Xamarin.Mac xamarinmac was computed. 
Xamarin.TVOS xamarintvos was computed. 
Xamarin.WatchOS xamarinwatchos was computed. 
Compatible target framework(s)
Additional computed target framework(s)
Learn more about Target Frameworks and .NET Standard.

NuGet packages (9)

Showing the top 5 NuGet packages that depend on FsHttp:

Package Downloads

Package Description


FSharp.Data (JSON) integration package for FsHttp


JSON.Net (Newtonsoft.Json) integration package for FsHttp


Dotnet library for easy access to Swate API.


A Library under the Perla umbrella. This package gives you a small set of APIs to interact with the JSPM Generator and Skypack API. Also, this library powers the package management + importmap features of Perla Dev Server.

GitHub repositories

This package is not used by any popular GitHub repositories.

Version Downloads Last updated
11.0.0 2,863 8/5/2023
11.0.0-preview01 584 3/25/2023
10.0.0 142,706 11/25/2022
10.0.0-preview3 225 11/23/2022
10.0.0-preview2 413 11/12/2022
10.0.0-preview1 249 11/12/2022
9.1.2 26,098 6/5/2022
9.1.1 2,829 4/24/2022
9.1.0 1,003 4/19/2022
9.0.6 1,034 4/19/2022
9.0.5 1,063 4/14/2022
9.0.4 860 4/8/2022
9.0.3 772 4/8/2022
9.0.2 2,542 4/6/2022
9.0.1 688 4/5/2022
9.0.0 13,155 4/5/2022
8.0.1 7,321 3/6/2022
8.0.0 544 3/2/2022
7.0.0 31,886 12/13/2021
6.0.1 1,705 11/23/2021
6.0.0 410 11/22/2021
0.9.0 1,251 7/14/2019

     - #92: `expect` and `assert` pass through the original response instead of unit.

     - #93 (thanks @drhumlen): Changed content type 'text/json' to 'application/json'.
     - Http modules are always AutoOpen in both Dsl and DslCE.
     - No extra modules for builder methods.

     - #89: No more blocking requests using net5 with FSI.

     v9.0.0 / v9.0.1
     - Redefined builders (see README.md).
     - Many breaking changes (see "Migrations" sections in the docu).

     - Added JSON toArray functions
     - Fixed #99: Response.saveFile should create the directory if not present.

     - Supporting netstandard2.1 again.

     - Referenced lowest possible FSharp.Core and other referenced packages version.

     - Support for netstandard2.0.
     - New 'FsHttp.NewtonsoftJson' integration package.
     - More JSON functions and defaults config.

     - #100 - Removed FSI print messages.

     - Fixed naming inconsistency for 'Response.deserialize...' functions.
     - More C# JSON functions.

     - Fix: Using GlobalConfig.Json.defaultJsonSerializerOptions as default for jsonSerialize.

     - Fixed #103: FSI response printing and initialization doesn't work out of the box anymore.

     - .Net 7 support (thank you @Samuel-Dufour)
     - Breaking change: Corrected typo "guessMineTypeFromPath" -> "guessMimeTypeFromPath"
     - Breaking change: Module 'Helper', 'HelperInternal' and 'HelperAutos' refactored
     - #115: Remove print messages when downloading streams
     - Printing: Separate print functions for response and request via Request.print and Response.print
     - Printing: Default request (IToRequest) printing in FSI
     - Removed net5.0 targets in all projects
     - PrintHint.printDebugMessages: Moved to FsHttp.Helper.Fsi.logDebugMessages as a global switch
     - #113 - Config.timeoutInSeconds bug

     - #117: Escape string for query params values (by @maciej-izak - thank you)
     (!!) This can be seen as breaking change.
     - #112: Allow to add (multiple) headers (by @Samuel-Dufour - thank you)

     - #121 (Breaking change): Turning off debug logs in FSI (breaking change in signature / namespace)
     - #124: Support Repeating Query Parameters (thanks @DaveJohnson8080)
     - #106 (Breaking change): Allow filename metadata with other "parts" (thanks @dawedawe)
     - Breaking change: ContentTypeForPart custom operations should come after part definition
     - #104 (Breaking change): Automatic GZip response decompression per Default
     - Other breaking changes:
       - Removed `ContentTypeWithEncoding` and used optional `charset` parameter in `ContentType` overloads.
       - Renamed `byteArray` to `binary` in Dsl, DslCE and CSharp.
       - Caution (!!): Renamed `stringPart` to `textPart` and changed argument order for `name` and `value` in Dsl and DslCE.
       - Restructured types in Domain
       - `Helper` is a module instead of a namespace, and some things were moved.
       - All transformers in config are a list of transformers instead of a single item.
       - Removed `setHttpClient`. Please use `setHttpClientFactory` instead.
       - `setHttpClientFactory` takes a `Config` as input argument.