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Ruby 標準ライブラリの WEBrick で Web サーバを作る

Ruby

Posted at 2017-04-27

発端

Web ブラウザからどういう内容が送信されているかを見るために書いてみた。

WEBrick を使った Web サーバのサンプルコード

このコードを実行すると、 Web サーバが起動する。

require 'webrick'
require 'cgi'

s = WEBrick::HTTPServer.new(
  :Port => 8000,
  :HTTPVersion => WEBrick::HTTPVersion.new('1.1'),
  :AccessLog => [[open(IO::NULL, 'w'), '']] # アクセスログを出力しない
)

s.mount_proc('/') do |req, res|
  puts "========== #{Time.new} =========="
  # リクエスト内容を出力
  puts req.request_line
  puts ''
  puts req.raw_header
  puts "\n#{req.body}" if req.body
  # レスポンス内容を出力
  body = "<html><body>\n"
  body += "#{CGI.escapeHTML(req.request_line)}"
  body += "<br>#{CGI.escapeHTML(req.body)}\n" if req.body
  body += "</body></html>\n"
  res.status = 200
  res['Content-Type'] = 'text/html'
  res.body = body
end

Signal.trap('INT'){s.shutdown}
s.start

curl コマンドでサンプルの Web サーバに HTTP GET アクセスしてみる

curl コマンドの実行結果。

$ curl -sSv 'http://localhost:8000/a/b/?c=d'
*   Trying ::1...
* TCP_NODELAY set
* Connected to localhost (::1) port 8000 (#0)
> GET /a/b/?c=d HTTP/1.1
> Host: localhost:8000
> User-Agent: curl/7.51.0
> Accept: */*
>
< HTTP/1.1 200 OK
< Content-Type: text/html
< Server: WEBrick/1.3.1 (Ruby/2.4.1/2017-03-22)
< Date: Thu, 27 Apr 2017 13:43:25 GMT
< Content-Length: 52
< Connection: Keep-Alive
<
<html><body>
GET /a/b/?c=d HTTP/1.1
</body></html>
* Curl_http_done: called premature == 0
* Connection #0 to host localhost left intact

Web サーバ側の出力結果。

========== 2017-04-27 22:43:25 +0900 ==========
GET /a/b/?c=d HTTP/1.1

Host: localhost:8000
User-Agent: curl/7.51.0
Accept: */*

curl コマンドでサンプルの Web サーバに HTTP POST アクセスしてみる

curl コマンドの実行結果。

$ curl -sSv -X POST 'http://localhost:8000/a/b/?c=d' --data 'e=f'
*   Trying ::1...
* TCP_NODELAY set
* Connected to localhost (::1) port 8000 (#0)
> POST /a/b/?c=d HTTP/1.1
> Host: localhost:8000
> User-Agent: curl/7.51.0
> Accept: */*
> Content-Length: 3
> Content-Type: application/x-www-form-urlencoded
>
* upload completely sent off: 3 out of 3 bytes
< HTTP/1.1 200 OK
< Content-Type: text/html
< Server: WEBrick/1.3.1 (Ruby/2.4.1/2017-03-22)
< Date: Thu, 27 Apr 2017 13:43:37 GMT
< Content-Length: 61
< Connection: Keep-Alive
<
<html><body>
POST /a/b/?c=d HTTP/1.1
<br>e=f
</body></html>
* Curl_http_done: called premature == 0
* Connection #0 to host localhost left intact

Web サーバ側の出力結果。

========== 2017-04-27 22:43:37 +0900 ==========
POST /a/b/?c=d HTTP/1.1

Host: localhost:8000
User-Agent: curl/7.51.0
Accept: */*
Content-Length: 3
Content-Type: application/x-www-form-urlencoded

e=f

参考資料

library webrick https://docs.ruby-lang.org/ja/latest/library/webrick.html

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