Http Client in Idris

Here’s the translation of the HTTP Client example from Go to Idris, formatted in Markdown suitable for Hugo:

Our example demonstrates how to make HTTP requests in Idris. We’ll use the Network.HTTP module to issue a simple HTTP GET request.

import Network.HTTP
import Network.URI
import Effect.Exception
import Data.String

main : IO ()
main = do
  -- Issue an HTTP GET request to a server
  let url = "https://example.com"
  Right uri <- parseURI url
    | Left err => putStrLn $ "Invalid URL: " ++ show err

  result <- try $ get uri
  case result of
    Left err => putStrLn $ "Error: " ++ show err
    Right response => do
      -- Print the HTTP response status
      putStrLn $ "Response status: " ++ show (status response)

      -- Print the first 5 lines of the response body
      let body = getBody response
      let lines = take 5 $ lines body
      putStrLn "First 5 lines of response body:"
      traverse_ putStrLn lines

In this example:

We import the necessary modules for HTTP requests, URI parsing, and exception handling.
We define our main function as an IO () action.
We specify a URL and parse it into a URI using parseURI. If parsing fails, we print an error message.
We use try to handle potential exceptions when making the HTTP GET request with the get function.
If the request is successful, we print the response status using status response.
We then extract the response body with getBody response, split it into lines, and print the first 5 lines.

To run this program, you would typically compile it and then execute the resulting binary:

$ idris2 -o http_client http_client.idr
$ ./build/exec/http_client
Response status: 200 OK
First 5 lines of response body:
<!DOCTYPE html>
<html>
<head>
    <title>Example Domain</title>
    <meta charset="utf-8" />

Note that Idris’s standard library might not include a full-featured HTTP client. In practice, you might need to use external libraries or implement more robust HTTP handling for production use.

Logging in Idris

Command Line Arguments in Idris

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Http Client in Idris