A Clojure HTTP library wrapping the Apache HttpComponents client.
This library has taken over from mmcgrana's clj-http. Please send a pull request or open an issue if you have any problems
The main HTTP client functionality is provided by the
clj-http.client namespace:
(require '[clj-http.client :as client])The client supports simple get, head, put, post, and delete
requests. Responses are returned as Ring-style response maps:
(client/get "http://google.com")
=> {:status 200
:headers {"date" "Sun, 01 Aug 2010 07:03:49 GMT"
"cache-control" "private, max-age=0"
"content-type" "text/html; charset=ISO-8859-1"
...}
:body "<!doctype html>..."}More example requests:
(client/get "http://site.com/resources/id")
(client/get "http://site.com/resources/3" {:accept :json})
(client/post "http://site.com/resources" {:body byte-array})
(client/post "http://site.com/resources" {:body "string"})
(client/get "http://site.com/protected" {:basic-auth ["user" "pass"]})
(client/get "http://site.com/protected" {:basic-auth "user:pass"})
(client/get "http://site.com/search" {:query-params {"q" "foo, bar"}})
(client/get "http://site.com/favicon.ico" {:as :byte-array})
(client/post "http://site.com/api"
{:basic-auth ["user" "pass"]
:body "{\"json\": \"input\"}"
:headers {"X-Api-Version" "2"}
:content-type :json
:socket-timeout 1000
:conn-timeout 1000
:accept :json})
;; Need to contact a server with an untrusted SSL cert?
(client/get "https://alioth.debian.org" {:insecure? true})
;; If you don't want to follow-redirects automatically:
(client/get "http://site.come/redirects-somewhere" {:follow-redirects false})
;; Send form params as a urlencoded body
(client/post "http//site.com" {:form-params {:foo "bar"}})A more general request function is also available, which is useful
as a primitive for building higher-level interfaces:
(defn api-action [method path & [opts]]
(client/request
(merge {:method method :url (str "http://site.com/" path)} opts)))The client will throw exceptions on, well, exceptional status
codes. clj-http will throw a
Slingshot Stone that can be
caught by a regular (catch Exception e ...) or in Slingshot's try+
block:
(client/get "http://site.com/broken")
=> Stone Object thrown by throw+: {:status 404, :headers {"server" "nginx/1.0.4",
"x-runtime" "12ms",
"content-encoding" "gzip",
"content-type" "text/html; charset=utf-8",
"date" "Mon, 17 Oct 2011 23:15 :36 GMT",
"cache-control" "no-cache",
"status" "404 Not Found",
"transfer-encoding" "chunked",
"connection" "close"},
:body "...body here..."}
clj-http.client/wrap-exceptions/fn--227 (client.clj:37)
;; You can also ignore exceptions and handle them yourself:
(client/get "http://site.com/broken" {:throw-exceptions false})(spacing added by me to be human readable)
The client will also follow redirects on the appropriate 30* status
codes.
The client transparently accepts and decompresses the gzip and
deflate content encodings.
A proxy can be specified by setting the Java properties:
<scheme>.proxyHost and <scheme>.proxyPort where <scheme> is the client
scheme used (normally 'http' or 'https').
clj-http can use persistent connections to speed up connections if multiple connections are being used:
(with-connection-pool {:timeout 5 :threads 4 :insecure? false}
(get "http://aoeu.com/1")
(post "http://aoeu.com/2")
(get "http://aoeu.com/3")
...
(get "http://aoeu.com/999"))This is MUCH faster than sequentially performing all requests, because a persistent connection can be used instead creating a new connection for each request.
This feature is fairly new, please let me know if you have any feedback!
If you need to fake clj-http responses (for things like testing and such), check out the clj-http-fake library.
clj-http is available as a Maven artifact from
Clojars:
[clj-http "0.2.4"]Previous versions available as
[clj-http "0.2.3"]
[clj-http "0.2.2"]
[clj-http "0.2.1"]The design of clj-http is inspired by the
Ring protocol for Clojure HTTP
server applications.
The client in clj-http.core makes HTTP requests according to a given
Ring request map and returns Ring response maps corresponding to the
resulting HTTP response. The function clj-http.client/request uses
Ring-style middleware to layer functionality over the core HTTP
request/response implementation. Methods like clj-http.client/get
are sugar over this clj-http.client/request function.
To run the tests:
$ lein deps
$ lein test
Run all tests (including integration):
$ lein test :all
Run tests against 1.2.1, 1.3 and 1.4
$ lein multi deps
$ lein multi test
$ lein multi test :all
Released under the MIT License: http://www.opensource.org/licenses/mit-license.php
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