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Programming language: Elixir
License: MIT License
Tags: HTTP    

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README

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Ivar

Ivar is an adapter based HTTP client that provides the ability to build composable HTTP requests.

The key goals of Ivar are to allow requests to be constructed in a composable manner (pipeline friendly) and to simplify building, sending and receiving requests for a number of well known http clients.

Supported Adapters

HTTP Client Adapter
HTTPoison ivar_httpoison

Usage

Add ivar to your list of dependencies in mix.exs, plus the http adapter you are going to use:

def deps do
  [
    {:ivar, "~> 0.9.0"},
    {:ivar_httpoison, "~> 0.1.0"}
  ]
end

Setup up the config for your chosen adapater

config :ivar,
  adapter: Ivar.HTTPoison

Basic usage

Ivar.get("https://example.com")
|> Ivar.send
|> Ivar.unpack
# {"<!doctype html>\n<html>...", %HTTPoison.Response{}}

JSON encoding/decoding

Ivar uses the Poison library for encoding and decoding JSON, so make sure you have it listed along side Ivar in your mix.exs.

def deps do
  [
    {:ivar, "~> 0.9.0"},
    {:poison, "~> 3.0"},
    ...
  ]
end

You can then specify that you want to send JSON when putting the request body. If the response contains the application/json content type header, the Ivar.unpack function will then decode the response for you.

Ivar.post("https://some-echo-server")
|> Ivar.put_body(%{some: "data"}, :json)
|> Ivar.send
|> Ivar.unpack
# {%{some: "data"}, %HTTPoison.Response{}}

Real world example

This is simplified extract from a real world application where Ivar is being used to send email via the mailgun service.

url = "https://api.mailgun.net/v3/domain.com/messages"
mail_data = %{to: "[email protected]", ...}
files = [{"inline", File.read!("elixir.png"), "elixir.png"}, ...]

Ivar.new(:post, url)
|> Ivar.put_auth({"api", "mailgun_api_key"}, :basic)
|> Ivar.put_body(mail_data, :url_encoded)
|> Ivar.put_files(files)
|> Ivar.send