Node.js＆Express：提供部分文本文件

I have a webserver with node.js and express. When I serve a text file that is big, it takes a lot of time to load into the browser. Imagine a 34 MB text file being served to the client, he would have to download the 34 MB only to check for something in the log file.I have a webserver with node.js and express. Wh