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| c | SPDX-License-Identifier | Long | Arg | Help | Protocols | Added | Category | Multi | See-also | Example | |||
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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 |
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--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.