The problem was discovered when using HTTP Factory for an external request to the server that performs redirection. The request method executes a request to the specified url of the string type. If the response code indicates a redirect, then the redirect url is obtained from the Location header. After that, another request is executed with a new url.

The redirect url is an instance of the Uri class. During the operation of this class, the UrlHelper class is called, in which the url is parsed. When making the first request, the url type is a string. However, in the case of redirection, the url is an array with one element, since $response->headers['Location'] is passed immediately as an argument. Therefore, when trying to make a second request for a new URl, the error parse_url() occurs: Argument #1 ($url) must be of type string, array given in the UriHelper class line 38.

This screenshot shows that the content of the Location header is an array, not a string. Which is the reason for the error.

The problem was found only when using the CURLOPT_FOLLOWLOCATION = false parameter. In this case, Joomla executes the redirect url request on its own.

Summary of Changes

Change a $redirect_uri = new Uri($response->headers['Location']); to $redirect_uri = new Uri($response->headers['Location'][0]);

Testing Instructions

It may not be the most correct, but the fastest way to check the result of this change is to run the query directly from the template index.php file.

1. Open it index.php Your frontend template
2. Add the following code to it

use Joomla\CMS\Http\HttpFactory;

$options = new Registry();
$options->set(
	'transport.curl',
	[
		CURLOPT_FOLLOWLOCATION   => false, 
	]
);

$http = (new HttpFactory)->getHttp($options, ['curl', 'stream']);

$url = 'enter here any URL with redirect ';

$response = $http->get($url);
echo '<pre>';
print_r($response->body);
echo '</pre>';

3. Run the request (refresh the page) and you will see an error parse_url(): Argument #1 ($url) must be of type string, array given
4. Apply this PR (download the build and update Joomla 5.0.2)

or in the file libraries/src/Http/Transport/CurlTransport.php find the line $redirect_uri = new Uri($response->headers['Location']) and replace it to $redirect_uri = new Uri($response->headers['Location'][0]);
5. Run the request again (refresh the page again)
6. Error has gone

Actual result BEFORE applying this Pull Request

An error parse_url(): Argument #1 ($url) must be of type string, array given in ROOT\libraries\vendor\joomla\uri\src\UriHelper.php:38

Expected result AFTER applying this Pull Request

Error has gone

Link to documentations

Please select:

• Documentation link for docs.joomla.org:

• No documentation changes for docs.joomla.org needed

• Pull Request link for manual.joomla.org:

• No documentation changes for manual.joomla.org needed