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Edit File : FEATURES.md \| Size : 5.85 KB
<!-- Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al. SPDX-License-Identifier: curl --> # 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 - redirect stderr - parallel transfers ## libcurl - URL RFC 3986 syntax - custom maximum download time - custom lowest download speed acceptable - custom output result after completion - guesses protocol from hostname unless specified - supports .netrc - progress bar with time statistics while downloading - standard proxy environment variables support - have run on 101 operating systems and 28 CPU architectures - selectable network interface for outgoing traffic - IPv6 support on Unix and Windows - happy eyeballs dual-stack IPv4 + IPv6 connects - persistent connections - SOCKS 4 + 5 support, with or without local name resolving - pre-proxy support, for proxy chaining - supports username and password in proxy environment variables - operations through HTTP proxy "tunnel" (using CONNECT) - replaceable memory functions (malloc, free, realloc, etc) - asynchronous name resolving - both a push and a pull style interface - international domain names (IDN) - transfer rate limiting - stable API and ABI - TCP keep alive - TCP Fast Open - DNS cache (that can be shared between transfers) - non-blocking single-threaded parallel transfers - Unix domain sockets to server or proxy - DNS-over-HTTPS - uses non-blocking name resolves - selectable name resolver backend ## URL API - parses RFC 3986 URLs - generates URLs from individual components - manages "redirects" ## Header API - easy access to HTTP response headers, from all contexts - named headers - iterate over headers ## TLS - selectable TLS backend(s) - TLS False Start - TLS version control - TLS session resumption - key pinning - mutual authentication - Use dedicated CA cert bundle - Use OS-provided CA store - separate TLS options for HTTPS proxy ## HTTP - HTTP/0.9 responses are optionally accepted - HTTP/1.0 - HTTP/1.1 - HTTP/2, including multiplexing and server push - GET - PUT - HEAD - POST - multipart formpost (RFC 1867-style) - authentication: Basic, Digest, NTLM (9) and Negotiate (SPNEGO) to server and proxy - resume transfers - 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 - HTTP/2 or HTTP/1.1 to HTTPS proxy - retrieve file modification date - Content-Encoding support for deflate, gzip, brotli and zstd - "Transfer-Encoding: chunked" support in uploads - HSTS - alt-svc - ETags - HTTP/1.1 trailers, both sending and getting ## HTTPS - HTTP/3 - using client certificates - verify server certificate - via HTTP proxy, HTTPS proxy or SOCKS proxy - select desired encryption - select usage of a specific TLS version - ECH ## FTP - download - authentication - Kerberos 5 - active/passive using PORT, EPRT, PASV or EPSV - single file size information (compare to HTTP HEAD) - 'type=' URL support - directory listing - directory 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 directory depth limit ## FTPS - 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 ## SSH (both SCP and SFTP) - selectable SSH backend - known hosts support - public key fingerprinting - both password and public key auth ## SFTP - both password and public key auth - with custom commands sent before/after the transfer - directory listing ## TFTP - download - upload ## TELNET - connection negotiation - custom telnet options - stdin/stdout I/O ## LDAP - 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, Kerberos 5 and External - send emails - mail from support - mail size support - mail auth support for trusted server-to-server relaying - multiple recipients - via http-proxy ## SMTPS - 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, Kerberos 5 and External - list emails - retrieve emails - enhanced command support for: CAPA, DELE, TOP, STAT, UIDL and NOOP via custom requests - via http-proxy ## POP3S - 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, Kerberos 5 and External - list the folders of a mailbox - select a mailbox with support for verifying the `UIDVALIDITY` - fetch emails with support for specifying the UID and SECTION - upload emails via the append command - enhanced command support for: EXAMINE, CREATE, DELETE, RENAME, STATUS, STORE, COPY and UID via custom requests - via http-proxy ## IMAPS - 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` Back

Edit File : FEATURES.md | Size : 5.85 KB

<!--
Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.

SPDX-License-Identifier: curl
-->

# 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
- redirect stderr
- parallel transfers

## libcurl

- URL RFC 3986 syntax
- custom maximum download time
- custom lowest download speed acceptable
- custom output result after completion
- guesses protocol from hostname unless specified
- supports .netrc
- progress bar with time statistics while downloading
- standard proxy environment variables support
- have run on 101 operating systems and 28 CPU architectures
- selectable network interface for outgoing traffic
- IPv6 support on Unix and Windows
- happy eyeballs dual-stack IPv4 + IPv6 connects
- persistent connections
- SOCKS 4 + 5 support, with or without local name resolving
- *pre-proxy* support, for *proxy chaining*
- supports username and password in proxy environment variables
- operations through HTTP proxy "tunnel" (using CONNECT)
- replaceable memory functions (malloc, free, realloc, etc)
- asynchronous name resolving
- both a push and a pull style interface
- international domain names (IDN)
- transfer rate limiting
- stable API and ABI
- TCP keep alive
- TCP Fast Open
- DNS cache (that can be shared between transfers)
- non-blocking single-threaded parallel transfers
- Unix domain sockets to server or proxy
- DNS-over-HTTPS
- uses non-blocking name resolves
- selectable name resolver backend

## URL API

- parses RFC 3986 URLs
- generates URLs from individual components
- manages "redirects"

## Header API

- easy access to HTTP response headers, from all contexts
- named headers
- iterate over headers

## TLS

- selectable TLS backend(s)
- TLS False Start
- TLS version control
- TLS session resumption
- key pinning
- mutual authentication
- Use dedicated CA cert bundle
- Use OS-provided CA store
- separate TLS options for HTTPS proxy

## HTTP

- HTTP/0.9 responses are optionally accepted
- HTTP/1.0
- HTTP/1.1
- HTTP/2, including multiplexing and server push
- GET
- PUT
- HEAD
- POST
- multipart formpost (RFC 1867-style)
- authentication: Basic, Digest, NTLM (9) and Negotiate (SPNEGO)
  to server and proxy
- resume transfers
- 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
- HTTP/2 or HTTP/1.1 to HTTPS proxy
- retrieve file modification date
- Content-Encoding support for deflate, gzip, brotli and zstd
- "Transfer-Encoding: chunked" support in uploads
- HSTS
- alt-svc
- ETags
- HTTP/1.1 trailers, both sending and getting

## HTTPS

- HTTP/3
- using client certificates
- verify server certificate
- via HTTP proxy, HTTPS proxy or SOCKS proxy
- select desired encryption
- select usage of a specific TLS version
- ECH

## FTP

- download
- authentication
- Kerberos 5
- active/passive using PORT, EPRT, PASV or EPSV
- single file size information (compare to HTTP HEAD)
- 'type=' URL support
- directory listing
- directory 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 directory depth limit

## FTPS

- 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

## SSH (both SCP and SFTP)

- selectable SSH backend
- known hosts support
- public key fingerprinting
- both password and public key auth

## SFTP

- both password and public key auth
- with custom commands sent before/after the transfer
- directory listing

## TFTP

- download
- upload

## TELNET

- connection negotiation
- custom telnet options
- stdin/stdout I/O

## LDAP

- 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, Kerberos 5 and
  External
- send emails
- mail from support
- mail size support
- mail auth support for trusted server-to-server relaying
- multiple recipients
- via http-proxy

## SMTPS

- 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,
  Kerberos 5 and External
- list emails
- retrieve emails
- enhanced command support for: CAPA, DELE, TOP, STAT, UIDL and NOOP via
  custom requests
- via http-proxy

## POP3S

- 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,
  Kerberos 5 and External
- list the folders of a mailbox
- select a mailbox with support for verifying the `UIDVALIDITY`
- fetch emails with support for specifying the UID and SECTION
- upload emails via the append command
- enhanced command support for: EXAMINE, CREATE, DELETE, RENAME, STATUS,
  STORE, COPY and UID via custom requests
- via http-proxy

## IMAPS

- 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`

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