url_matcher: Check file size via HEAD request
url_matcher: Check file size via HEAD request

* Make sure we do not download a 100MB PDF just because it's located at
  some URL.

* This commit fixes a bug that caused issues in deployment. The constant
  5e6 reflects the author's assumption about nice, readable web
  documents at the time of commiting this piece of code.

Signed-off-by: mr.Shu <8e7be411ad89ade93d144531f3925d0bb4011004@shu.io>

mrshu/brutal-plugins