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Clojure Programming Cookbook

You're reading from   Clojure Programming Cookbook Handle every problem you come across in the world of Clojure programming with this expert collection of recipes

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Product type Paperback
Published in Oct 2016
Publisher Packt
ISBN-13 9781785885037
Length 618 pages
Edition 1st Edition
Languages
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Authors (2):
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Nicolas Modrzyk Nicolas Modrzyk
Author Profile Icon Nicolas Modrzyk
Nicolas Modrzyk
Makoto Hashimoto Makoto Hashimoto
Author Profile Icon Makoto Hashimoto
Makoto Hashimoto
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Toc

Table of Contents (11) Chapters Close

Preface 1. Live Programming with Clojure FREE CHAPTER 2. Interacting with Collections 3. Clojure Next 4. File Access and the Network 5. Working with Other Languages 6. Concurrency and Parallelism 7. Advanced Tips 8. Web Applications 9. Testing 10. Deployment and DevOps

Making use of Clojure HTTP client

For retrieving simple HTTP requests, http-kit is a library of choice when the simple slurp function from clojure.core does not provide enough flexibility. While http-kit is both a server and a client, this recipe will only look at the client side of things.

Getting ready

Including the http-kit library into our project is now relatively straightforward. Let's add the following line to the project.clj file:

[http-kit "2.1.18"] 

How to do it...

A simple request to retrieve the weather data, as we have seen before in the parsing JSON section, is quite simply done by calling the get function of http-kit. The function returns a promise by default, meaning the call will run in the background and block when trying to get the result by calling deref or @.

Let's get set quickly with the namespace and the target URL to retrieve weather data from the openweathermap API endpoint:

(ns chapter04.somehttp1 
  (:require [org.httpkit.client :as http])) 
 
...
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