Support Symfony StreamedResponse again

[andig]

Ever since 8e2554e StreamedResponses are no longer working since in https://github.com/php-pm/php-pm-httpkernel/blob/master/Bridges/HttpKernel.php#L173 $content will be false. Instead or additionally, a call to syResponse->sendContent() is needed.

However, since StreamedResponses can become huge, their output should rather be parsed in a streamed way instead of just concatenating to a buffer.

@marcj any idea how this could be done, i.e. ob_get_contents() in a streamed way? Like capturing our own STDOUT to a readable stream? Also, the contents should be piped on to the ReactReponse immediately.

• add StreamedResponse back in
• push/pull in async manner

[andig]

@marcj any idea how this could be done, i.e. ob_get_contents() in a streamed way? Like capturing our own STDOUT to a readable stream? Also, the contents should be piped on to the ReactReponse immediately.

Regarding that I think the only available option is to use ReactReponse ->write() instead of ReactReponse ->end() in https://github.com/php-pm/php-pm-httpkernel/blob/master/Bridges/HttpKernel.php#L243. This will still need the full response to be stored in memory of the php-cgi process but might make it possible to push bits of it down to the client already.