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# Features -- what curl can do ## 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 - metalink support (13) - parallel transfers ## libcurl - 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 with time statistics while downloading - "standard" proxy environment variables support - compiles on win32 (reported builds on 70+ operating systems) - selectable network interface for outgoing traffic - IPv6 support on unix and Windows - happy eyeballs dual-stack connects - persistent connections - SOCKS 4 + 5 support, with or without local name resolving - supports user name and password in proxy environment variables - operations through HTTP proxy "tunnel" (using CONNECT) - replaceable memory functions (malloc, free, realloc, etc) - asynchronous name resolving (6) - both a push and a pull style interface - international domain names (11) ## HTTP - HTTP/0.9 responses are optionally accepted - HTTP/1.0 - HTTP/1.1 - HTTP/2, including multiplexing and server push (5) - GET - PUT - HEAD - POST - multipart formpost (RFC1867-style) - authentication: Basic, Digest, NTLM (9) and Negotiate (SPNEGO) (3) 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 referrer string - range - proxy authentication - time conditions - via HTTP proxy, HTTPS proxy or SOCKS proxy - retrieve file modification date - Content-Encoding support for deflate and gzip - "Transfer-Encoding: chunked" support in uploads - automatic data compression (12) ## HTTPS (1) - (all the HTTP features) - HTTP/3 experimental support - using client certificates - verify server certificate - via HTTP proxy, HTTPS proxy or SOCKS proxy - select desired encryption - select usage of a specific SSL version ## FTP - download - authentication - Kerberos 5 (14) - 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, HTTPS proxy or SOCKS proxy - all operations can be tunneled through proxy - customizable to retrieve file modification date - no dir depth limit ## FTPS (1) - implicit `ftps://` support that use SSL on both connections - explicit "AUTH TLS" 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 (7) - 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 - upload - resume ## SMB - SMBv1 over TCP and SSL - download - upload - authentication with NTLMv1 ## SMTP - authentication: Plain, Login, CRAM-MD5, Digest-MD5, NTLM (9), Kerberos 5 (4) and External. - send e-mails - mail from support - mail size support - mail auth support for trusted server-to-server relaying - multiple recipients - via http-proxy ## SMTPS (1) - implicit `smtps://` support - explicit "STARTTLS" usage to "upgrade" plain `smtp://` connections to use SSL - via http-proxy ## POP3 - authentication: Clear Text, APOP and SASL - SASL based authentication: Plain, Login, CRAM-MD5, Digest-MD5, NTLM (9), Kerberos 5 (4) and External. - list e-mails - retrieve e-mails - enhanced command support for: CAPA, DELE, TOP, STAT, UIDL and NOOP via custom requests - via http-proxy ## POP3S (1) - implicit `pop3s://` support - explicit "STLS" usage to "upgrade" plain `pop3://` connections to use SSL - via http-proxy ## IMAP - authentication: Clear Text and SASL - SASL based authentication: Plain, Login, CRAM-MD5, Digest-MD5, NTLM (9), Kerberos 5 (4) and External. - list the folders of a mailbox - select a mailbox with support for verifying the UIDVALIDITY - fetch e-mails with support for specifying the UID and SECTION - upload e-mails via the append command - enhanced command support for: EXAMINE, CREATE, DELETE, RENAME, STATUS, STORE, COPY and UID via custom requests - via http-proxy ## IMAPS (1) - implicit `imaps://` support - explicit "STARTTLS" usage to "upgrade" plain `imap://` connections to use SSL - via http-proxy ## MQTT - Subscribe to and publish topics using url scheme `mqtt://broker/topic` ## Footnotes 1. requires a TLS library 2. requires OpenLDAP or WinLDAP 3. requires a GSS-API implementation (such as Heimdal or MIT Kerberos) or SSPI (native Windows) 4. requires a GSS-API implementation, however, only Windows SSPI is currently supported 5. requires nghttp2 6. requires c-ares 7. requires libssh2, libssh or wolfSSH 8. requires libssh2 or libssh 9. requires OpenSSL, GnuTLS, mbedTLS, NSS, yassl, Secure Transport or SSPI (native Windows) 10. - 11. requires libidn2 or Windows 12. requires libz, brotli and/or zstd 13. requires libmetalink, and either an Apple or Microsoft operating system, or OpenSSL, or GnuTLS, or NSS 14. requires a GSS-API implementation (such as Heimdal or MIT Kerberos)