un-nest curl

curl-8.15.0/docs/cmdline-opts/proxy-pinnedpubkey.md

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+---
+c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
+SPDX-License-Identifier: curl
+Long: proxy-pinnedpubkey
+Arg: <hashes>
+Help: FILE/HASHES public key to verify proxy with
+Protocols: TLS
+Category: proxy tls
+Added: 7.59.0
+Multi: single
+See-also:
+  - pinnedpubkey
+  - proxy
+Example:
+  - --proxy-pinnedpubkey keyfile $URL
+  - --proxy-pinnedpubkey 'sha256//ce118b51897f4452dc' $URL
+---
+
+# `--proxy-pinnedpubkey`
+
+Use the specified public key file (or hashes) to verify the proxy. This can be
+a path to a file which contains a single public key in PEM or DER format, or
+any number of base64 encoded sha256 hashes preceded by 'sha256//' and
+separated by ';'.
+
+When negotiating a TLS or SSL connection, the server sends a certificate
+indicating its identity. A public key is extracted from this certificate and
+if it does not exactly match the public key provided to this option, curl
+aborts the connection before sending or receiving any data.
+
+Before curl 8.10.0 this option did not work due to a bug.