Never cache thru disk implicitly

[mvorisek]

Description

In a few places in this lib and guzzle/psr7 repo php://temp stream is used to store temporary data.

Caching thru disk by default is not expected by a HTTP library.

This is a feature request to change all php://temp to php://memory.

If user needs to process huge files, he should pass php://temp manually with awareness it can be slow and imply huge disk IO.

(related with #3115 as stream processing is the best option vs. buffering the whole response)

[TimWolla]

Caching thru disk by default is not expected by a HTTP library.

[citation needed]

[mvorisek]

It is my opinion, at least I do not want any disk IO for temporary data when HTTP download is involved.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed after 2 weeks if no further activity occurs. Thank you for your contributions.