CURLINFO_PROTOCOL.3: mention the existing defined names

.\" *                            | (__| |_| |  _ <| |___

.\" *                             \___|\___/|_| \_\_____|

.\" *

.\" * Copyright (C) 1998 - 2016, Daniel Stenberg, <daniel@haxx.se>, et al.

.\" * Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al.

.\" *

.\" * This software is licensed as described in the file COPYING, which

.\" * you should have received as part of this distribution. The terms

CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_PROTOCOL, long *p);

.SH DESCRIPTION

Pass a pointer to a long to receive the version used in the last http connection.

The returned value will be one of the CURLPROTO_* values.

Pass a pointer to a long to receive the version used in the last http

connection.  The returned value will be exactly one of the CURLPROTO_* values:

.nf

CURLPROTO_DICT, CURLPROTO_FILE, CURLPROTO_FTP, CURLPROTO_FTPS,

CURLPROTO_GOPHER, CURLPROTO_HTTP, CURLPROTO_HTTPS, CURLPROTO_IMAP,

CURLPROTO_IMAPS, CURLPROTO_LDAP, CURLPROTO_LDAPS, CURLPROTO_POP3,

CURLPROTO_POP3S, CURLPROTO_RTMP, CURLPROTO_RTMPE, CURLPROTO_RTMPS,

CURLPROTO_RTMPT, CURLPROTO_RTMPTE, CURLPROTO_RTMPTS, CURLPROTO_RTSP,

CURLPROTO_SCP, CURLPROTO_SFTP, CURLPROTO_SMB, CURLPROTO_SMBS, CURLPROTO_SMTP,

CURLPROTO_SMTPS, CURLPROTO_TELNET, CURLPROTO_TFTP

.SH PROTOCOLS

All

.SH EXAMPLE