curl-w32/docs/cmdline-opts/etag-compare.md

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Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al. curl etag-compare <file> Pass an ETag from a file as a custom header HTTP 7.68.0 http single
etag-save
time-cond
--etag-compare etag.txt $URL

--etag-compare

This option makes a conditional HTTP request for the specific ETag read from the given file by sending a custom If-None-Match header using the stored ETag.

For correct results, make sure that the specified file contains only a single line with the desired ETag. An empty file is parsed as an empty ETag.

Use the option --etag-save to first save the ETag from a response, and then use this option to compare against the saved ETag in a subsequent request.