`--verbose`: document both `{` and `}` lines

[Thibaulltt]

Specify which documentation you found a problem with

The man page of my current curl package on Fedora 42. Output of curl --version:

curl 8.11.1 (x86_64-redhat-linux-gnu) libcurl/8.11.1 OpenSSL/3.2.6 zlib/1.3.1.zlib-ng brotli/1.2.0 libidn2/2.3.8 libpsl/0.21.5 libssh/0.11.3/openssl/zlib nghttp2/1.64.0 OpenLDAP/2.6.10
Release-Date: 2024-12-11
Protocols: dict file ftp ftps gopher gophers http https imap imaps ipfs ipns ldap ldaps mqtt pop3 pop3s rtsp scp sftp smb smbs smtp smtps telnet tftp ws wss
Features: alt-svc AsynchDNS brotli GSS-API HSTS HTTP2 HTTPS-proxy IDN IPv6 Kerberos Largefile libz NTLM PSL SPNEGO SSL threadsafe TLS-SRP UnixSockets

The problem

I tried to download some file using curl recently and did not succeed. I then turned on the --verbose option to see what was happening and got a few lines with characters I did not recognize, here's an excerpt:

> GET /congress/2025/h264-hd/39c3-2079-eng-deu-pol-Breaking_architecture_barriers_Running_x86_games_and_apps_on_ARM_hd.mp4 HTTP/2
> Host: cdn.media.ccc.de
> User-Agent: curl/8.11.1
> Accept: */*
>
* Request completely sent off
{ [5 bytes data]
* TLSv1.3 (IN), TLS handshake, Newsession Ticket (4):
{ [265 bytes data]
* TLSv1.3 (IN), TLS handshake, Newsession Ticket (4):
{ [281 bytes data]

I knew about the > and < lines, but was unsure about the other ones. Displaying the man page for curl v8.11.0 show the following:

       -v, --verbose
              Makes curl verbose during the operation. Useful for debugging and seeing what's going on under the  hood.
              A  line starting with > means header data sent by curl, < means header data received by curl that is hid‐
              den in normal cases, and a line starting with * means additional info provided by curl.

From this, I now know what the * lines stand for. But I'm still in the dark about what the { and } lines mean!

[Thibaulltt]

Thanks! Now I know what they do :)

For the record, my original problem that prompted this issue was that I forgot to use the -L flag when I tried downloading some files...