router:
curl 7.52.1 (mips-openwrt-linux-gnu) libcurl/7.52.1 mbedTLS/2.4.0
Protocols: file ftp ftps http https
Features: IPv6 Largefile SSL

centos:
curl 7.29.0 (x86_64-redhat-linux-gnu) libcurl/7.29.0 NSS/3.21 Basic ECC zlib/1.2.7 libidn/1.28 libssh2/1.4.3
Protocols: dict file ftp ftps gopher http https imap imaps ldap ldaps pop3 pop3s rtsp scp sftp smtp smtps telnet tftp
Features: AsynchDNS GSS-Negotiate IDN IPv6 Largefile NTLM NTLM_WB SSL libz unix-sockets