| c: Copyright (C) 1998 - 2022, 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 | 
 | Example: --proxy-pinnedpubkey keyfile $URL | 
 | Example: --proxy-pinnedpubkey 'sha256//ce118b51897f4452dc' $URL | 
 | Added: 7.59.0 | 
 | See-also: pinnedpubkey proxy | 
 | Multi: single | 
 | --- | 
 | Tells curl to 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 will | 
 | abort the connection before sending or receiving any data. |