php - How to forward a Symfony Request to another server using the Http Client (with optional changes)?

Solution:

Symfony's Http Client does not accept anHttpFoundation\Request as a parameter to make new requests.

You'll need to convert theRequest object into the necessary parameters (including converting the path, method, passing appropriate headers, etc) "manually".

Then, you'd have to create the anHttpFoundation\Response based on the client's response (which, again, cannot simply be sent back in your controller).

Depending on your specific requirements, it's not particularly onerous. A naive, probably buggy implementation would be something like:

use Symfony\Component\HttpFoundation;
use Symfony\Contracts\HttpClient\HttpClientInterface;

class FooProxy
{
    public function __construct(private HttpClientInterface $client)
    {
    }

    public function __invoke(HttpFoundation\Request $request): HttpFoundation\Response
    {
        $options            = [];
        $newServer          = 'https://www.example.com';
        $options['headers'] = $request->headers->all();
        $options['body']    = $request->getContent();

        $clientResponse = $this->client->request(
            $request->getMethod(),
            $newServer . $request->getRequestUri(),
            $options
        );

        return new HttpFoundation\Response(
            $clientResponse->getContent(false),
            $clientResponse->getStatusCode(),
            $clientResponse->getHeaders(false)
        );

    }
}
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Again, this is very naive implementation. You'd need to make sure that you deal with any exceptions and edge cases.

Take into account that PHP is not a great choice of language to build a real HTTP proxy.