curl

HTTP requests from the command line — options, headers, and SSL.

Options

-o <file>Write output to file

-u user:passHTTP authentication

-vVerbose output

-sSilent mode

-iInclude response headers

-IHeaders only (HEAD request)

-LFollow redirects

Request & data

-X POSTSet HTTP method

-d 'body'POST body (URL-encoded)

-d @filePOST body from file

-F key=valMultipart form upload

-GAppend -d data as GET params

Headers

-H "Key: val"Add request header

-H "Content-Type: application/json"JSON content type

-A "agent"Set user agent

-b name=valSend cookie

--compressedRequest gzip compression

SSL

-k, --insecureSkip certificate verification

--cacert <file>CA certificate file

-E <cert>Client certificate

Examples

# GET with JSON header
curl -H "Accept: application/json" https://api.example.com/users

# POST JSON body
curl -X POST -H "Content-Type: application/json" \
  -d '{"name":"Ada"}' https://api.example.com/users

# Download file
curl -o output.zip https://example.com/file.zip

# Bearer token auth
curl -H "Authorization: Bearer $TOKEN" https://api.example.com

More Tools cheatsheets

Git

Everyday version control — branches, commits, undo, and rebase.

Bash

Shell scripting, redirection, and command-line survival.

Regex

Pattern matching — anchors, classes, quantifiers, groups.