spec/support/example_server.rb

require 'webrick'

class ExampleService < WEBrick::HTTPServlet::AbstractServlet
  PORT = 65432 # rubocop:disable NumericLiterals

  def do_GET(request, response) # rubocop:disable MethodName
    case request.path
    when '/'
      handle_root(request, response)
    when '/params'
      handle_params(request, response)
    when '/multiple-params'
      handle_multiple_params(request, response)
    when '/proxy'
      response.status = 200
      response.body     = 'Proxy!'
    when '/not-found'
      response.body   = 'not found'
      response.status = 404
    when '/redirect-301'
      response.status = 301
      response['Location'] = "http://127.0.0.1:#{PORT}/"
    when '/redirect-302'
      response.status = 302
      response['Location'] = "http://127.0.0.1:#{PORT}/"
    when '/eof'
      request.instance_variable_get('@socket').close
    else
      response.status = 404
    end
  end

  def handle_root(request, response)
    response.status = 200
    case request['Accept']
    when 'application/json'
      response['Content-Type'] = 'application/json'
      response.body = '{"json": true}'
    else
      response['Content-Type'] = 'text/html'
      response.body   = '<!doctype html>'
    end
  end

  def handle_params(request, response)
    return unless request.query_string == 'foo=bar'

    response.status = 200
    response.body   = 'Params!'
  end

  def handle_multiple_params(request, response)
    params = CGI.parse(request.query_string)

    return unless params == {'foo' => ['bar'], 'baz' => ['quux']}

    response.status = 200
    response.body   = 'More Params!'
  end

  def do_POST(request, response) # rubocop:disable MethodName
    case request.path
    when '/form'
      if request.query['example'] == 'testing-form'
        response.status = 200
        response.body   = 'passed :)'
      else
        response.status = 400
        response.body   = 'invalid! >:E'
      end
    when '/body'
      if request.body == 'testing-body'
        response.status = 200
        response.body   = 'passed :)'
      else
        response.status = 400
        response.body   = 'invalid! >:E'
      end
    else
      response.status = 404
    end
  end

  def do_HEAD(request, response) # rubocop:disable MethodName
    case request.path
    when '/'
      response.status = 200
      response['Content-Type'] = 'text/html'
    else
      response.status = 404
    end
  end
end

ExampleServer = WEBrick::HTTPServer.new(:Port => ExampleService::PORT, :AccessLog => [])
ExampleServer.mount '/', ExampleService

t = Thread.new { ExampleServer.start }
trap('INT') do
  ExampleServer.shutdown
  exit
end

Thread.pass while t.status && t.status != 'sleep'