如何从URL读取文件的创建日期信息

Question

Is it possible for me to get the creation date of a file given a url without downloading the file?

lets say its http:///sever1.example.com/foo.bar . How do I get the date that foo bar was created on a bash terminal

Answer 1

There is no need to use curl , BASH can handle TCP connections:

$ exec 5<>/dev/tcp/google.com/80
$ echo -e "GET / HTTP/1.0\n" >&5
$ head -5 <&5
HTTP/1.0 200 OK
Date: Tue, 04 Dec 2018 13:29:30 GMT
Expires: -1
Cache-Control: private, max-age=0
Content-Type: text/html; charset=ISO-8859-1
$ exec 5>&-

Answer 2

Inline with @MichaWiedenmann I see the only solution is to use a 3rd party binary like curl to help bash in the command

curl -Is http://server1.example.com/foo.bar

This would print information which can be manipulated with grep and sed to fit my purposes