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- c: Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
- SPDX-License-Identifier: curl
- Long: etag-compare
- Arg: <file>
- Help: Pass an ETag from a file as a custom header
- Protocols: HTTP
- Added: 7.68.0
- Category: http
- Example: --etag-compare etag.txt $URL
- See-also: etag-save time-cond
- ---
- 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.
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