curl/docs/cmdline-opts/_PROTOCOLS.md

PROTOCOLS

curl supports numerous protocols, or put in URL terms: schemes. Your particular build may not support them all.

DICT

Lets you lookup words using online dictionaries.

FILE

Read or write local files. curl does not support accessing file:// URL remotely, but when running on Microsoft Windows using the native UNC approach works.

FTP(S)

curl supports the File Transfer Protocol with a lot of tweaks and levers. With or without using TLS.

GOPHER(S)

Retrieve files.

HTTP(S)

curl supports HTTP with numerous options and variations. It can speak HTTP version 0.9, 1.0, 1.1, 2 and 3 depending on build options and the correct command line options.

IMAP(S)

Using the mail reading protocol, curl can download emails for you. With or without using TLS.

LDAP(S)

curl can do directory lookups for you, with or without TLS.

MQTT

curl supports MQTT version 3. Downloading over MQTT equals subscribe to a topic while uploading/posting equals publish on a topic. MQTT over TLS is not supported (yet).

POP3(S)

Downloading from a pop3 server means getting a mail. With or without using TLS.

RTMP(S)

The Realtime Messaging Protocol is primarily used to serve streaming media and curl can download it.

RTSP

curl supports RTSP 1.0 downloads.

SCP

curl supports SSH version 2 scp transfers.

SFTP

curl supports SFTP (draft 5) done over SSH version 2.

SMB(S)

curl supports SMB version 1 for upload and download.

SMTP(S)

Uploading contents to an SMTP server means sending an email. With or without TLS.

TELNET

Fetching a telnet URL starts an interactive session where it sends what it reads on stdin and outputs what the server sends it.

TFTP

curl can do TFTP downloads and uploads.

WS(S)

WebSocket done over HTTP/1. WSS implies that it works over HTTPS.