Measure gzip size via command line without actually compress it

Measure request size by gzip compression

To measure gzip sizing for a request, you don’t need to actually gzip it, just use pipe | to pipe the stream from curl to gzip to wc :

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# before gzip
$ curl https://www.paddingleft.com | wc -c
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 57847 0 57847 0 0 99114 0 --:--:-- --:--:-- --:--:-- 99053
57847

# after gzip
$ curl https://www.paddingleft.com | gzip | wc -c
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 57848 0 57848 0 0 111k 0 --:--:-- --:--:-- --:--:-- 110k
10443

As you can see, before gzip it’s 57847 bytes, after gzip it’s 10443 bytes.

Measure file size after gzip

You could do same things to measure a file gzip sizing by gzip with -c option, so it won’t actually gzip it.

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$ gzip -c foo.jpg | wc -c
53688