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Suave is a simple web development F# library providing a lightweight web server and a set of combinators to manipulate route flow and task composition.

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Introduction

Suave Logo

Suave is a simple web development F# library providing a lightweight web server and a set of combinators to manipulate route flow and task composition. Suave is inspired in the simplicity of Happstack and born out of the necessity of embedding web server capabilities in my own applications. Still in its early stages Suave supports HTTPS, multiple TCP/IP bindings, Basic Access Authentication, Keep-Alive. Suave also takes advantage of F# asynchronous workflows to perform non-blocking IO. In fact, Suave is written in a completely non-blocking fashion throughout.

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What follows is a tutorial on how to create applications. Scroll past the tutorial to see detailed function documentation.

Tutorial: Hello World!

The simplest Suave application is a simple HTTP server that greets all visitors with the string "Hello World!"

open Suave // always open suave
open Suave.Http.Successful // for OK-result
open Suave.Web // for config
startWebServer defaultConfig (OK "Hello World!")

Now that you've discovered how to do "Hello World!", go read the rest of the documentation - editable on the gh-pages branch.

Suave.Testing

We have a NuGet ready for your testing needs; Suave is an excellent server for running in-process integation tests, as it's very fast to spawn. On an ordinary laptop, running hundreds of randomised tests and micro-benchmarks as well as all Suave unit tests, take about 5 seconds on mono.

Start by installing:

paket add nuget suave.testing

You can now use it:

open Suave
open Suave.Types
open Suave.Testing

open Fuchu

testCase "parsing a large multipart form" <| fun _ ->

  let res =
    runWithConfig (OK "hi")
    |> req HttpMethod.POST "/" (Some byteArrayContent)

  Assert.Equal("should get the correct result", "hi", res)

All of our tests use this assembly; you can do too.

How to Build

If you just want to hack away or try the samples, just open suave.sln and run them!

For 'getting started quick', run 'build.sh'.


If you want to reproduce a build or run a build in a CI-environment, just follow the below guide.

We're using a cross-platform build suite called albacore/rake. Since the version of the build is dynamically generated by taking environment state, you need to generate the corresponding AssemblyVersionInfo.fs files:

bundle
bundle exec rake

On linux and os x you'll have ruby out of the box. On Windows, you have to install it.

You can also just delete the project referenced to all AssemblyVersionInfo.fs files when you open the solution.

Coding Guidelines

Suave.X where X is a module is where we expect users to look. We don't expect users of the library to have to look at Y in Suave.X.Y, so for server-specific code, please stick to the Y module/namespace. That way we make the API discoverable.

We have a TeamCity CI server set up to provide continuous integration for Suave. You can pull nugets from this server, by adding https://tc-oss.intelliplan.net/guestAuth/app/nuget/v1/FeedService.svc/ to your list of nuget sources; this allows you to get pre-release nugets of suave directly into your development environment.

Style Guide

Two space indentation.

match x with // '|' characters at base of 'match'
| A     -> ()
| Bcdef -> "aligned arrows" // space after '|' character

Parameters

Let type annotations be specified with spaces after the argument symbol and before the type.

module MyType =
  let from_string (scheme : string) =
    // ...

Method formatting with no spaces after/before normal parenthesis

let my_method_name first_arg (second : WithType) = async { // and monad builder
  return! f first_arg second
  } // at base of 'let' + 2 spaces

You need to document your methods with '///' to create XML-doc. A XML documentation file is generated together with the compilation and is distributed with the NuGet so that others can read your code's intentions easily.

Don't put unnecessary parenthesis unless it makes the code more clear.

When writing functions that take some sort of 'configuration' or that you can imagine would like to be called with a parameter which is almost always the same value for another function body's call-site, put that parameter before more-often-varying parameters in the function signature.

Testing

Run Tests as a console app. Return status code = 0 means success.

Upgrade openssl

Windows: paket update openssl.redist

OS X: brew install openssl && brew update openssl && cp /usr/local/Cellar/openssl/1.0.1j_1/lib/ .

Linux: ...

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Suave is a simple web development F# library providing a lightweight web server and a set of combinators to manipulate route flow and task composition.

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