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cmdline-opts/fail.md: expand and clarify

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Closes #13890
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Daniel Stenberg 2024-06-05 10:52:29 +02:00
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docs/cmdline-opts/fail.md
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@ -18,11 +18,17 @@ Example:
# `--fail` # `--fail`
Fail fast with no output at all on server errors. This is useful to enable Fail with error code 22 and with no response body output at all for HTTP
scripts and users to better deal with failed attempts. In normal cases when an transfers returning HTTP response codes at 400 or greater.
HTTP server fails to deliver a document, it returns an HTML document stating
so (which often also describes why and more). This command line option In normal cases when an HTTP server fails to deliver a document, it returns a
prevents curl from outputting that and return error 22. body of text stating so (which often also describes why and more) and a 4xx
HTTP response code. This command line option prevents curl from outputting
that data and instead returns error 22 early. By default, curl does not
consider HTTP response codes to indicate failure.
To get both the error code and also save the content, use --fail-with-body
instead.
This method is not fail-safe and there are occasions where non-successful This method is not fail-safe and there are occasions where non-successful
response codes slip through, especially when authentication is involved response codes slip through, especially when authentication is involved