Amazon S3 on PHP GAE not working with curl extension

Question

Could anyone help me figure out how to get S3 working on my php app engine (runtime: php55)?

I saw somewhere that you can use it without CURL and found t

Answer 1

Even though GAE supports "cURL" - it is only a wrapper, so some functionality has not been implemented yet - particularly the whole multi_curl_* thing.

Have not found a way to deactivate it - but from SDK v3 cURL is not anymore required - so you might give that a try.