Is it possible to find out the size of a file, its type, without downloading the whole thing?

Question

PHP

Is it possible, using curl, to find out the size of a file from a link (and other information) without downloading the entire file to the server? Is it technically possible. Thanks

Answer 1

if the server gives this information, then yes, and if it does not, then no.
Depends on who distributes the files shorter.
Well, infa in the headlines, respectively.

Answer 2

https://ru.wikipedia.org/wiki/HTTP#HEAD

Answer 3

Of course, the first few bytes of the file are unique for each type, and the type can be calculated from them. Thanks to this property, for example, the library works libmagic.
https://gist.github.com/leommoore/f9e57ba2aa4bf197ebc5

Answer 4

as an option

curl -m 1 -sS -D - -X HEAD https://hsto.org/r/w120/webt/5a/80/fd/5a80fd8c368f0954751429.png 2>/dev/null | grep -Po '(?<=Content-Length: )(\d+)|((?<=Content-Type: )[a-z\-]+/[a-z\-]+)'

image/png
12597

HEAD will not work if the target server sends a redirect. For such a task, it is better to implement a small script or application.

Answer 5

wget --spider URL
Wget for Windows ( gnuwin32.sourceforge.net/packages/wget.htm )
Wget and cURL are included in the AWGG download program files ( https://videohelp.com/software/AWGG ) by five different engines/"engines" (Windows) .