fix(CURLRequest): multiple header sections after redirects

[ducng99]

Description
Fixes an issue where multiple header sections are returned if there are redirects. The original code would only parse the first header section, and treated the rest as body. For example:

With output:

HTTP/2 308
content-type: text/html; charset=utf-8
content-length: 211
location: http://example.com
date: Mon, 20 Jan 2025 11:46:34 GMT
server: nginx/1.21.6
vary: Origin

HTTP/2 200
content-type: text/html; charset=utf-8
content-length: 211
date: Mon, 20 Jan 2025 11:46:34 GMT
server: nginx/1.21.6
vary: Origin

Hello world

$response->getBody() returns:

HTTP/2 200
content-type: text/html; charset=utf-8
content-length: 211
date: Mon, 20 Jan 2025 11:46:34 GMT
server: nginx/1.21.6
vary: Origin

Hello world

With these changes, the redirect header section is stripped out, only the latest header section is parsed (the 200 one in this example), and body is Hello world.

Not sure if this issue has been discussed before but I couldn't find an issue related to this.

My machine details:
Ubuntu 24.04
PHP 8.2.27
libcurl 7.88.1

Checklist:

• Securely signed commits
• Component(s) with PHPDoc blocks, only if necessary or adds value
• Unit testing, with >80% coverage
• User guide updated
• Conforms to style guide

[michalsn]

Please add a changelog entry here: https://github.com/codeigniter4/CodeIgniter4/blob/develop/user_guide_src/source/changelogs/v4.6.1.rst under the "Bugs Fixed" section. Please follow the style from the previous changelogs.

[ducng99]

Change to draft as I need to add checks for Location: header as well.
In cases where a 3xx code is returned but no Location header so curl won't redirect but we strip out the only header section.

[michalsn]

Looks good, thank you.

[samsonasik]

please check phpstan and rector notice

[ducng99]

@samsonasik Can you double check those notices please? I think I'm missing something here, they are about other files that have nothing to do with my changes. Thanks

Also composer analyze returns OK on my local machine

[neznaika0]

See Checks (48) on github.
https://github.com/codeigniter4/CodeIgniter4/actions/runs/12897354640/job/35962281706#step:12:34
https://github.com/codeigniter4/CodeIgniter4/actions/runs/12897354638/job/35962281396?pr=9426

Run composer phpstan:baseline and vendor/bin/rector process

[ducng99]

@neznaika0 @paulbalandan
An update to phpstan is causing errors in development branch, as the errors are not part of this PR, can you check them please?

As for the rector notice, the file is also not part of this PR, the reported line system/HTTP/Exceptions/RedirectException.php:75 had a pass before, see Rector check with changes for 190f720
May be rector was also updated?

In any case, these two files are not part of this PR so I can't push fixes for them here

[paulbalandan]

Hi @ducng99 I see that the failing tests are not related to your changed files, so you can ignore that.