如何通过cURL仅获取页面的前40KB

Question

So I do not want to pull whole page, just the first 40KB of the page. Just like this Facebook Debugger tool does.

My goal is to grab social media meta-data, i.e. og:image etc.

Can be in any programming language, PHP or Python.

I do have code in phpQuery that uses file_get_contents/cURL and I know how to parse the received HTML, my question is "How to fetch only first nKB of a page without fetching whole page"

Answer 1

This is not specific to Facebook or any other social media sites but you can get first 40 KB with python like this:

import urllib2
start = urllib2.urlopen(your_link).read(40000)