EM-HTTP-Client

EventMachine based HTTP Request interface. Supports streaming response processing, uses Ragel HTTP parser.

• Simple interface for single & parallel requests via deferred callbacks
• Automatic gzip & deflate decoding
• Basic-Auth support
• Custom timeouts

Screencast / Demo of using EM-HTTP-Request:

• everburning.com/news/eventmachine-screencast-em-http-request/

Getting started

  # install & configure gemcutter repos
  gem update --system
  gem install gemcutter
  gem tumble

  gem install em-http-request

  irb:0> require 'em-http'

Simple client example

  EventMachine.run {
    http = EventMachine::HttpRequest.new('http://127.0.0.1/').get :query => {'keyname' => 'value'}, :timeout => 10

    http.callback {
      p http.response_header.status
      p http.response_header
      p http.response

      EventMachine.stop
    }
  }

Multi request example

  EventMachine.run {
    multi = EventMachine::MultiRequest.new

    # add multiple requests to the multi-handler
    multi.add(EventMachine::HttpRequest.new('http://www.google.com/').get)
    multi.add(EventMachine::HttpRequest.new('http://www.yahoo.com/').get)

    multi.callback  {
      p multi.responses[:succeeded]
      p multi.responses[:failed]

      EventMachine.stop
    }
  }

Basic-Auth example

  EventMachine.run {
    http = EventMachine::HttpRequest.new('http://www.website.com/').get :head => {'authorization' => ['user', 'pass']}

    http.errback { failed }
    http.callback {
      p http.response_header
      EventMachine.stop
    }
  }

OAuth example

  EventMachine.run {
    http = EventMachine::HttpRequest.new('http://www.website.com/').get :head => {'authorization' => 'OAuth oauth_nonce=...'}
    http.errback { failed }
    http.callback {
      p http.response_header
      EventMachine.stop
    }
  }

POST example

  EventMachine.run {
    http1 = EventMachine::HttpRequest.new('http://www.website.com/').post :body => {"key1" => 1, "key2" => [2,3]}
    http2 = EventMachine::HttpRequest.new('http://www.website.com/').post :body => "some data"

    # ...
  }

Streaming body processing

  EventMachine.run {
    http = EventMachine::HttpRequest.new('http://www.website.com/').get
    http.stream { |chunk| print chunk }

    # ...
  }

Proxy example

  EventMachine.run {
    http1 = EventMachine::HttpRequest.new('http://www.website.com/').get :proxy => {
      :host => 'www.myproxy.com',
      :port => 8080,
      :authorization => ['username', 'password'] # authorization is optional
    }