Docker web server always returns status 200-CodePudding

I have problem with my web server hosted in php:8.0-apache docker container, always returning status code 200, even if it's set to different value. Same code outside of container works correctly

my php.ini file is:

log_errors=On
error_log=/dev/stderr

and php code is:

... some code ...

http_response_code(400);
exit;

but I receive response:

HTTP/1.1 200 OK

Any ideas what's wrong with my setup?

edit: docker file:

FROM php:8.0-apache

RUN echo "<?php echo '{some json content}'; http_response_code(400); exit; ?>" >> /var/www/html/index.php

COPY php.ini /usr/local/etc/php/

CodePudding user response：

I figured what was the problem:

there was already sent header with status 200 when I called echo "...", so http_response_code(400) was ignored.

To solve this issue (and reason why it was working with default configuration on my pc) is to set output_buffering in php.ini to some value, so output is not sent immediately.

log_errors=On
error_log=/dev/stderr
output_buffering=4096

see: https://stackoverflow.com/a/8028987/1557025