Bug: Blank Page on Production Server

[Andrewsuares]

Using Codeigniter 4.0.3

We were seeing a blank page after uploading CodeIgniter to our linux server. After days of troubleshooting, I figured this was the problem below in Events.php. Disabled it from line 25 and the page loaded. Can you please fix this. Codeigniter 3 was known to just work out of the box. Having an IF statement here that works only on production means that devs wouldn't see this during testing.
Events::on('pre_system', function () {
if (ENVIRONMENT !== 'testing')
{
while (\ob_get_level() > 0)
{
\ob_end_flush();
}

	\ob_start(function ($buffer) {
		return $buffer;
	});
}

[paulbalandan]

By any chance, is your php.ini setting zlib.output_compression not turned off? I have a case where zlib compression is on and output buffering is on resulted to a blank page.

[Andrewsuares]

From my php.ini.

zlib.output_compression = On

Out buffering needs to check this setting and enable or disable itself automatically or throw up an error.

[khairilazizee]

My zlib.output_compression = Off, but i still get the error. why?

i am using mamp in windows.

[paulbalandan]

check if you have write permissions on the writable folder

[khairilazizee]

i have the write permission on all folder. Is this happen because i am using mamp?

[paulbalandan]

please raise your support question in the forum. Others may have faced your issue and have solutions.