Enable http logging for http_client (JRuby)

Gemfile

# A sample Gemfile
source "https://rubygems.org"

gem "jruby-httpclient", require: 'http_client'

stdout

[DEBUG] SingleClientConnManager - Get connection for route HttpRoute[{}->http://httpbin.org:80]
[DEBUG] DefaultClientConnectionOperator - Connecting to httpbin.org/54.175.219.8:80
[DEBUG] RequestAddCookies - CookieSpec selected: best-match
[DEBUG] RequestAuthCache - Auth cache not set in the context
[DEBUG] DefaultHttpClient - Attempt 1 to execute request
[DEBUG] DefaultClientConnection - Sending request: GET /get? HTTP/1.1
[DEBUG] wire - >> "GET /get? HTTP/1.1[\r][\n]"
[DEBUG] wire - >> "Host: httpbin.org:80[\r][\n]"
[DEBUG] wire - >> "Connection: Keep-Alive[\r][\n]"
[DEBUG] wire - >> "User-Agent: Apache-HttpClient/4.1.1 (java 1.5)[\r][\n]"
[DEBUG] wire - >> "[\r][\n]"
[DEBUG] headers - >> GET /get? HTTP/1.1
[DEBUG] headers - >> Host: httpbin.org:80
[DEBUG] headers - >> Connection: Keep-Alive
[DEBUG] headers - >> User-Agent: Apache-HttpClient/4.1.1 (java 1.5)
[DEBUG] wire - << "HTTP/1.1 200 OK[\r][\n]"
[DEBUG] wire - << "Server: nginx[\r][\n]"
[DEBUG] wire - << "Date: Tue, 14 Apr 2015 17:46:03 GMT[\r][\n]"
[DEBUG] wire - << "Content-Type: application/json[\r][\n]"
[DEBUG] wire - << "Content-Length: 187[\r][\n]"
[DEBUG] wire - << "Connection: keep-alive[\r][\n]"
[DEBUG] wire - << "Access-Control-Allow-Origin: *[\r][\n]"
[DEBUG] wire - << "Access-Control-Allow-Credentials: true[\r][\n]"
[DEBUG] wire - << "[\r][\n]"
[DEBUG] DefaultClientConnection - Receiving response: HTTP/1.1 200 OK
[DEBUG] headers - << HTTP/1.1 200 OK
[DEBUG] headers - << Server: nginx
[DEBUG] headers - << Date: Tue, 14 Apr 2015 17:46:03 GMT
[DEBUG] headers - << Content-Type: application/json
[DEBUG] headers - << Content-Length: 187
[DEBUG] headers - << Connection: keep-alive
[DEBUG] headers - << Access-Control-Allow-Origin: *
[DEBUG] headers - << Access-Control-Allow-Credentials: true
[DEBUG] DefaultHttpClient - Connection can be kept alive indefinitely
[DEBUG] wire - << "{[\n]"
[DEBUG] wire - << "  "args": {}, [\n]"
[DEBUG] wire - << "  "headers": {[\n]"
[DEBUG] wire - << "    "Host": "httpbin.org", [\n]"
[DEBUG] wire - << "    "User-Agent": "Apache-HttpClient/4.1.1 (java 1.5)"[\n]"
[DEBUG] wire - << "  }, [\n]"
[DEBUG] wire - << "  "origin": "31.221.100.54", [\n]"
[DEBUG] wire - << "  "url": "http://httpbin.org/get"[\n]"
[DEBUG] wire - << "}[\n]"
[DEBUG] SingleClientConnManager - Releasing connection org.apache.http.impl.conn.SingleClientConnManager$ConnAdapter@78890f30

test.rb

require 'bundler'
Bundler.require(:default)

java_import java.lang.System

System.set_property("org.apache.commons.logging.Log", "org.apache.commons.logging.impl.SimpleLog");
System.set_property("org.apache.commons.logging.simplelog.log.org.apache.http", "DEBUG");

client = HTTP::Client.new(:default_host => "http://httpbin.org/get")
client.get("/get")