nodejs改写http

	proxy_request = http.request opt, (p_res) ->
		headers = p_res.headers
		statusCode = p_res.statusCode
		content_encoding = headers["content-encoding"]
		res.writeHead(statusCode, headers)

		bfh = new BufferHelper()

		p_res.on 'data', (chunk) ->
			bfh.concat(chunk)

		p_res.on 'end', () ->
			buffer = bfh.toBuffer()
			
			if buffer.length != 0 && content_encoding == "gzip"
				str = ''
				zlib.gunzip buffer, (err, gunzip) ->
	 				str = gunzip.toString()
	 				str = str.replace('<title>', '<title>test test')
	 				zlib.gzip new Buffer(str), (err, gzip) ->
	 					res.write(gzip) 
	 					res.end()
			else
	 			res.write(buffer) if buffer.length != 0
	 			res.end()