Node.JS 重發網絡請求

/**
 * 重發網絡請求
 * 
 * @example
 * new Request(raw).send((result) => {
 *   console.log(result);
 * })
 */
class Request {

  /**
   * constructor
   *
   * @param {string} raw 抓包得到的原始字符串
   */
  constructor(raw) {
    const http = require('http');
    var options = this.parseOptions(raw)
    this.req = http.request(options, (res) => {
      console.log('STATUS:' + res.statusCode);
      console.log('HEADERS:' + JSON.stringify(res.headers));
      res.setEncoding('utf-8')
      res.on('data', (chunk) => {
        if (this.success) {
          this.success(chunk)
        }
      })
    })

    this.req.on('error', (e) => {
      if (this.error) {
        this.error(e)
      }
      console.log('request error!!!');
      console.error(e);
    })

    if (options.method == 'POST') {
      this.req.write(options.content)
    }
  }

  /**
   * 發起網絡請求
   *
   * @param {function} success 發送成功的回調方法
   * @param {function} error 發送失敗的回調方法
   */
  send(success, error) {
    this.success = success
    this.error = error
    this.req.end()
  }

  parseOptions(raw) {
    const url = require('url');
    var lines = raw.split('\n')
    var firstLine = lines[0]
    var arr = firstLine.split(' ')
    var options = url.parse(arr[1])
    options.method = arr[0]
    options.headers = {}
    for (var i = 0; i < lines.length; i++) {
      if (lines[i].trim().length == 0) {
        options.content = lines.slice(i).join('\n').trim()
        break
      } else if (i != 0) {
        var line = lines[i].trim()
        var m = line.match(/^([^:]+):(.*)$/)
        options.headers[m[1].trim()] = m[2].trim()
      }
    }

    if (!options.host) {
      options.host = options.headers['Host']
    }

    delete options.headers['Host']
    delete options.headers['Content-Length']
    return options
  }
}