Invalid character encoding after content-type header stacking

[valentin-popov]

Description

If Embed::mustRedirect returns true (this line), the request is repeated and the headers of every response are pushed into an array.

In the Embed\Document constructor, when the content-type header is extracted, the headers array is imploded using a comma as a separator (see this line). However, the comma is not used further as a delimiter during the regex matching, so a comma-suffixed value is passed to Parser::parse as an encoding, causing an error.

Because the comma is used by GuzzleHttp\Psr7\MessageTrait as a separator, it should also be considered when extracting the encoding parameter.

How to replicate

Call get on a google search URL

use Embed\Embed;

$embed = new Embed();

$url = 'https://www.google.com/search?q=linux&sca_esv=91f756f8d95b3a2b&biw=1682&bih=973&sxsrf=ADLYWILZ6bcSGHu7s3LGxCbmaeFwrJP5sw:1730981050201&ei=uqwsZ9buC-mCxc8PjJKL0Qk&ved=0ahUKEwjWs_D0lsqJAxVpQfEDHQzJIpoQ4dUDCA8&uact=5&oq=linux&gs_lp=Egxnd3Mtd2l6LXNlcnAiBWxpbnV4MgoQIxiABBgnGIoFMgQQIxgnMgoQIxiABBgnGIoFMgsQABiABBiRAhiKBTILEAAYgAQYkQIYigUyBRAAGIAEMgUQLhiABDIFEAAYgAQyBRAAGIAEMgUQABiABEi9EFCsC1isD3ADeAGQAQCYAZwBoAHJBKoBAzAuNLgBA8gBAPgBAZgCB6AC5wTCAgcQIxiwAxgnwgIKEAAYsAMY1gQYR8ICDRAAGIAEGLADGEMYigXCAgsQLhiABBjRAxjHAcICEBAuGIAEGNEDGEMYxwEYigXCAgoQABiABBhDGIoFwgITEC4YgAQY0QMYQxjHARjJAxiKBcICChAuGIAEGEMYigXCAgsQABiABBiSAxiKBcICCxAuGIAEGMcBGK8BmAMAiAYBkAYKkgcDMy40oAf1Pg&sclient=gws-wiz-serp'
$info = $embed->get($url);

[valentin-popov]

PR: #546