Commonly used · Troubleshooting the network

curl: Request URL or download content

Syntax

curl [-IsSfL] [-o file] URL

Options

-I

Only look at response headers

-o

save to file

-s / -S / -f / -L

Teaching Compatible Switch

Examples

curl -o config.json https://example.com/config.json

Usage and sandbox support

Only https://example.com/health and /config.json are simulated; no real requests are made.

Hands-on exercises

• Check the HTTP health interfaceEveryday
• Download remote configuration to localEveryday
• Query health interface response headerAdvanced
• Delivery Challenge ① Download ConfigurationAdvanced
• Download the configuration and explicitly select request optionsMaster

Full documentation ↗

Related commands

• ipQuery address and routing
• ssView sockets and listening ports
• pingCheck host connectivity
• digQuery DNS records
• nslookupQuery host address
• wgetDownload file
• sshLog in to the remote machine
• scpCopy files via SSH
• hostQuery DNS
• tracerouteProbing network routes
• tracepathDetection path and MTU
• mtrContinuously observe routing and packet loss
• ncTest connection or listening port
• socatConnect data streams to sockets
• tcpdumpCapture network packets
• nmapDetect authorized host port
• ethtoolQuery network interface information
• nmcliManage NetworkManager connections
• sftpTransfer files interactively through SSH
• ssh-keygenGenerate SSH key
• ssh-copy-idInstall the SSH public key
• opensslCheck TLS with certificate