/usr/share/doc/libcurl3-nss/FEATURES is in libcurl3-nss 7.22.0-3ubuntu4.
This file is owned by root:root, with mode 0o644.
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FEATURES
curl tool
- config file support
- multiple URLs in a single command line
- range "globbing" support: [0-13], {one,two,three}
- multiple file upload on a single command line
- custom maximum transfer rate
- redirectable stderr
libcurl supports
- full URL syntax with no length limit
- custom maximum download time
- custom least download speed acceptable
- custom output result after completion
- guesses protocol from host name unless specified
- uses .netrc
- progress bar/time specs while downloading
- "standard" proxy environment variables support
- compiles on win32 (reported builds on 40+ operating systems)
- selectable network interface for outgoing traffic
- IPv6 support on unix and Windows
- persistant connections
- socks5 support
- supports user name + password in proxy environment variables
- operations through proxy "tunnel" (using CONNECT)
- supports large files (>2GB and >4GB) both upload/download
- replacable memory functions (malloc, free, realloc, etc)
- asynchronous name resolving (*6)
- both a push and a pull style interface
HTTP
- HTTP/1.1 compliant (optionally uses 1.0)
- GET
- PUT
- HEAD
- POST
- Pipelining
- multipart formpost (RFC1867-style)
- authentication: Basic, Digest, NTLM(*9), GSS-Negotiate/Negotiate(*3) and
SPNEGO (*4) to server and proxy
- resume (both GET and PUT)
- follow redirects
- maximum amount of redirects to follow
- custom HTTP request
- cookie get/send fully parsed
- reads/writes the netscape cookie file format
- custom headers (replace/remove internally generated headers)
- custom user-agent string
- custom referer string
- range
- proxy authentication
- time conditions
- via http-proxy
- retrieve file modification date
- Content-Encoding support for deflate and gzip
- "Transfer-Encoding: chunked" support for "uploads"
HTTPS (*1)
- (all the HTTP features)
- using client certificates
- verify server certificate
- via http-proxy
- select desired encryption
- force usage of a specific SSL version (SSLv2(*7), SSLv3 or TLSv1)
FTP
- download
- authentication
- kerberos4 (*5), kerberos5 (*3)
- active/passive using PORT, EPRT, PASV or EPSV
- single file size information (compare to HTTP HEAD)
- 'type=' URL support
- dir listing
- dir listing names-only
- upload
- upload append
- upload via http-proxy as HTTP PUT
- download resume
- upload resume
- custom ftp commands (before and/or after the transfer)
- simple "range" support
- via http-proxy
- all operations can be tunneled through a http-proxy
- customizable to retrieve file modification date
- no dir depth limit
FTPS (*1)
- implicit ftps:// support that use SSL on both connections
- explicit "AUTH TSL" and "AUTH SSL" usage to "upgrade" plain ftp://
connection to use SSL for both or one of the connections
SCP (*8)
- both password and public key auth
SFTP (*8)
- both password and public key auth
- with custom commands sent before/after the transfer
TFTP
- download / upload
TELNET
- connection negotiation
- custom telnet options
- stdin/stdout I/O
LDAP (*2)
- full LDAP URL support
DICT
- extended DICT URL support
FILE
- URL support
- "uploads"
- resume
FOOTNOTES
=========
*1 = requires OpenSSL, GnuTLS, NSS, yassl, axTLS or PolarSSL
*2 = requires OpenLDAP
*3 = requires a GSSAPI-compliant library, such as Heimdal or similar.
*4 = requires FBopenssl
*5 = requires a krb4 library, such as the MIT one or similar.
*6 = requires c-ares
*7 = requires OpenSSL or NSS, as GnuTLS only supports SSLv3 and TLSv1
*8 = requires libssh2
*9 = requires OpenSSL, GnuTLS, NSS or yassl
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