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deps/curl/docs/cmdline-opts/anyauth.md

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+---
+c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
+SPDX-License-Identifier: curl
+Long: anyauth
+Help: Pick any authentication method
+Protocols: HTTP
+Category: http proxy auth
+Added: 7.10.6
+Multi: mutex
+See-also:
+  - proxy-anyauth
+  - basic
+  - digest
+Example:
+  - --anyauth --user me:pwd $URL
+---
+
+# `--anyauth`
+
+Tells curl to figure out authentication method by itself, and use the most
+secure one the remote site claims to support. This is done by first doing a
+request and checking the response-headers, thus possibly inducing an extra
+network round-trip. This is used instead of setting a specific authentication
+method, which you can do with --basic, --digest, --ntlm, and --negotiate.
+
+Using --anyauth is not recommended if you do uploads from stdin, since it may
+require data to be sent twice and then the client must be able to rewind. If
+the need should arise when uploading from stdin, the upload operation fails.
+
+Used together with --user.