Book Image

Elixir Cookbook

By : Paulo Pereira
Book Image

Elixir Cookbook

By: Paulo Pereira

Overview of this book

Table of Contents (16 chapters)
Elixir Cookbook
About the Author
About the Reviewers

Pattern matching an HTTPoison response

HTTPoison is an HTTP client for Elixir. We have already used it in the Managing dependencies recipe of Chapter 1, Command Line.

In this recipe, we will create a simple application that will take a URL and fetch the corresponding page, returning either the body or the headers of that request.

Getting ready

We will be using the get_pages application. You will find it in the source code of this book. The steps are as follows:

  1. Enter the application directory:

    > cd get_pages
  2. Fetch the dependencies and compile them:

    > mix deps.get && mix deps.compile
  3. Start the application:

    > iex –S mix

How to do it…

To get an HTTP response and perform pattern matching on it, we will follow these steps:

  1. Issue a request to fetch the elixir-lang main page and take the headers from the response:

    iex(1)> GetPages.get(:headers, "")

    The result is shown in the following screenshot:

  2. Now, we will request the main Google page and take the body from...