Stop writing data to the output buffer in case the connection is no l…

[DeepDiver1975]

Description

Bugfix: Stop writing data to the output buffer when the connection is not alive

Publicly shared video playback is sending a range http request to get the video
content. In cases where the user is seeking to different positions of the video
will result in a pretty high server load because all the video content is sent
to the browser. Without detecting the connection state on server side all data
is put to the output buffer.
With this change the server processes will stop sending data as soon as the
connection is detected as non-active.

#37219

How Has This Been Tested?

• ✋

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Database schema changes (next release will require increase of minor version instead of patch)
• Breaking change (fix or feature that would cause existing functionality to change)
• Technical debt
• Tests only (no source changes)

Checklist:

• Code changes
• Unit tests added
• Acceptance tests added
• Documentation ticket raised:
• Changelog item, see TEMPLATE

[update-docs]

Thanks for opening this pull request! The maintainers of this repository would appreciate it if you would create a changelog item based on your changes.

[codecov]

Codecov Report

Merging #37219 into master will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master   #37219      +/-   ##
============================================
- Coverage     64.87%   64.87%   -0.01%     
- Complexity    19146    19147       +1     
============================================
  Files          1269     1269              
  Lines         74947    74950       +3     
  Branches       1331     1331              
============================================
  Hits          48625    48625              
- Misses        25930    25933       +3     
  Partials        392      392              

Flag	Coverage Δ	Complexity Δ
#javascript	54.14% <ø> (ø)	0.00 <ø> (ø)
#phpunit	66.07% <0.00%> (-0.01%)	19147.00 <2.00> (+1.00)	⬇️

Impacted Files	Coverage Δ	Complexity Δ
lib/private/Files/View.php	84.42% <0.00%> (-0.42%)	391.00 <2.00> (+2.00)	⬇️
lib/private/legacy/files.php	0.00% <ø> (ø)	66.00 <0.00> (-1.00)
...AppFramework/Utility/ControllerMethodReflector.php	100.00% <0.00%> (ø)	10.00% <0.00%> (ø%)

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