|  | c: Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al. | 
|  | SPDX-License-Identifier: curl | 
|  | Long: no-alpn | 
|  | Tags: HTTP/2 | 
|  | Protocols: HTTPS | 
|  | Added: 7.36.0 | 
|  | See-also: no-npn http2 | 
|  | Requires: TLS | 
|  | Help: Disable the ALPN TLS extension | 
|  | Category: tls http | 
|  | Example: --no-alpn $URL | 
|  | Multi: boolean | 
|  | --- | 
|  | Disable the ALPN TLS extension. ALPN is enabled by default if libcurl was built | 
|  | with an SSL library that supports ALPN. ALPN is used by a libcurl that supports | 
|  | HTTP/2 to negotiate HTTP/2 support with the server during https sessions. |