March 2014
Intermediate to advanced
474 pages
10h 11m
English
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Chapter 5. Network I/O and Web Services
5.0. Introduction
More and more these days, it seems like every system we build has to talk to something, somewhere.[16] We’d hardly be doing anything if we didn’t actually talk with some other computers over some kind of network.
This chapter covers all of the normal remote communication modes you would expect—HTTP, TCP, UDP, and the like—as well as some relative newcomers[17] like message-oriented architectures.
5.1. Making HTTP Requests
Problem
You want to make a simple HTTP GET or POST request.
Solution
Use slurp to make simple HTTP GET requests:
(slurp"http://example.com");; -> "<!doctype html>\n<html>\n<head>\n <title>Example Domain</title> ...
Use the clj-http library to make GET, POST, and other requests with
specific parameters or headers, to handle redirects and other special
circumstances, or to get specific details about the response.
To follow along, add [clj-http "0.7.7"] to your project’s
dependencies, or use lein-try to start a REPL:
$ lein try clj-httpUse clj-http.client/get to make GET requests:
(require'[clj-http.client:ashttp])(:status(http/get"http://clojure.org"));; -> 200(->(http/get"http://clojure.org"):headers(get"server"));; -> "nginx"(->(http/get"http://www.amazon.com/"):cookieskeys);; -> ("session-id" "session-id-time" "x-wl-uid" "skin")
Parameters can be included in both GET and POST requests. Use
clj-http.client/post to make POST requests:
(http/get"http://google.com/"{:query-params ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.