curl -v

Use

curl -v https://example.org

What It Does

curl -v prints connection details, request headers, and response details.

Practice

Use it when a plain request fails and you need to see where.

Watch Out

Verbose output mixes diagnostic lines with response data. Read carefully.

What To Look For

• DNS resolution lines.
• Connection attempt and connected address.
• TLS handshake messages for HTTPS.
• Request lines beginning with >.
• Response lines beginning with <.
• HTTP status code.

Recovery

• No DNS answer: use host NAME.
• Connection refused: the service is not listening on the target address and port.
• 502 from the public service URL: check systemctl --user status site.service and the journal.
• Output is too much: redirect stderr to a file with curl -v URL >/tmp/body 2>/tmp/curl.log.

Docs Pointers

• Run man curl and search for -v.
• Read everything curl: verbose.
• Read curl, curl -I, HTTP inspection, reverse proxy, and service logs.