Description:
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If u save and run the test script sample below with the cli built in server:

php -S localhos:8000 -t .

Then when browsing to the file, the page never responds back (timeouts)

I've taken a look at the php cli server sourced and it seems that there a lot of 
missing http status codes, see https://github.com/php/php-
src/blob/master/sapi/cli/php_cli_server.c#L207

So it seems that there's an endless loop here

https://github.com/php/php-src/blob/master/sapi/cli/php_cli_server.c#L345

Test script:
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<?php
http_response_code(422);
echo 'Not being shown!';


Expected result:
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The script should show the page with the text:

Not being shown!

And the http status code "422"

Actual result:
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Fatal error: Maximum execution time of 30 seconds exceeded in Unknown on line 0

Seems to be endless loop