Http Client in F#

Here’s the translation of the Go HTTP client example to F#, formatted in Markdown suitable for Hugo:

Our example demonstrates how to create a simple HTTP client using F#. The F# standard library provides excellent support for HTTP clients through the System.Net.Http namespace.

open System
open System.Net.Http
open System.IO

[<EntryPoint>]
let main argv =
    // Create an instance of HttpClient
    use client = new HttpClient()

    // Issue an HTTP GET request to a server
    let response = 
        client.GetAsync("https://gobyexample.com")
        |> Async.AwaitTask
        |> Async.RunSynchronously

    // Ensure the request was successful
    response.EnsureSuccessStatusCode() |> ignore

    // Print the HTTP response status
    printfn "Response status: %A" response.StatusCode

    // Read the response content as a string
    let content = 
        response.Content.ReadAsStringAsync()
        |> Async.AwaitTask
        |> Async.RunSynchronously

    // Print the first 5 lines of the response body
    let lines = content.Split('\n')
    lines 
    |> Array.take (min 5 lines.Length) 
    |> Array.iter (printfn "%s")

    0 // return an integer exit code

In this F# example:

We use System.Net.Http.HttpClient to send HTTP requests. This is similar to the http.Client in the original example.
We create an instance of HttpClient using a use binding, which ensures the client is properly disposed of when it’s no longer needed.
We send a GET request using client.GetAsync(). This is an asynchronous operation, so we use F#’s async workflows to handle it.
We print the response status using printfn, which is similar to fmt.Println in the original example.
To read the response body, we use ReadAsStringAsync() and then split the content into lines.
We print the first 5 lines of the response body using F#’s array functions.

To run this program, save it as HttpClient.fs and use the F# compiler:

$ dotnet fsi HttpClient.fs
Response status: OK
<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>Go by Example</title>

This F# version provides equivalent functionality to the original example, demonstrating how to make HTTP requests and process responses in F#.

Logging in F#

Command Line Arguments in F#

Learn X By Example

Title here

Http Client in F#