Stream only specific responses

[cedric-anne]

Checklist before requesting a review

• I have read the CONTRIBUTING document.
• I have performed a self-review of my code.

Description

The proposed changes should permit to limit the usage of streamed responses to the endpoints that actually really require it.

These changes will also permit:

• to detect unexpected flush()/ob_flush()/ob_clean()/ob_end_clean() operations (I added a warning for this);
• to add the Symfony profiler in all GLPI pages, unless an exit()/die() instruction is used.

Whitespace changes should be ignored for the review. Many changes are just related to encapsulation of some scripts in a streamed response object.

[cconard96]

This would break the handling of debug error messages by the new API.
See DebugResponseMiddleware.php.

This handling would have to be adjusted.

[cedric-anne]

This would break the handling of debug error messages by the new API. See DebugResponseMiddleware.php.

This handling would have to be adjusted.

I reverted the changes made on the HLAPI. It will not be impacted by the current changes because it has its own controller.

[flegastelois]

Blank page (without errors): /front/ruledictionnarysoftware.php?replay_rule=replay_rule

[cedric-anne]

I put this PR back to draft.

In GLPI 11.0, the progress bar display is broken. I am not able to understand what is the issue behind this. Anyway, using flush() not always work as expected. For instance, if there is a proxy between the client and the PHP server, then the proxy may wait for the full response to be received before sending it to the client. The webserver itself may act like this.

With #18296, we will add a new progress bar system that we will have to use in replacement of the current system. Once it will be done, the current PR will be ready to be merged.

I tested the /front/cron.php behaviour (by putting sleep(5); Toolbox::logDebug('OK'); after the flush() instruction), and it is OK on my machine, the browser consider the response as fully received after 50ms, and the execution continues on the PHP server.