Cannot set response code - headers already sent - richdocumentscode/proxy.php on line 296

[derRichter]

here the same error. i wondered me to, what is the reason to close this bug without answer or fix?

get error:
PHP Warning: http_response_code(): Cannot set response code - headers already sent (output started at /var/www/nextcloud/apps/richdocumentscode/proxy.php:289) in /var/www/nextcloud/apps/richdocumentscode/proxy.php on line 296

updated the App Collabora Online - Built-in CODE Server
to Version 24.4.802, APACHE-lizensiert

full reboot the hole server

error and bug, still exist!

[Fri Oct 11 21:11:34.793313 2024] [php:warn] [pid 1372:tid 1372] [client 127.0.0.1:43290] PHP Warning: http_response_code(): Cannot set response code - headers already sent (output started at /var/www/nextcloud/apps/richdocumentscode/proxy.php:289) in /var/www/nextcloud/apps/richdocumentscode/proxy.php on line 296 [Fri Oct 11 21:11:34.836664 2024] [php:warn] [pid 952:tid 952] [client 127.0.0.1:43302] PHP Warning: http_response_code(): Cannot set response code - headers already sent (output started at /var/www/nextcloud/apps/richdocumentscode/proxy.php:289) in /var/www/nextcloud/apps/richdocumentscode/proxy.php on line 296 [Fri Oct 11 21:11:51.693984 2024] [php:warn] [pid 1322:tid 1322] [client 192.168.241.114:51304] PHP Warning: http_response_code(): Cannot set response code - headers already sent (output started at /var/www/nextcloud/apps/richdocumentscode/proxy.php:289) in /var/www/nextcloud/apps/richdocumentscode/proxy.php on line 296 [Fri Oct 11 21:11:51.746316 2024] [php:warn] [pid 1648:tid 1648] [client 192.168.241.114:51330] PHP Warning: http_response_code(): Cannot set response code - headers already sent (output started at /var/www/nextcloud/apps/richdocumentscode/proxy.php:289) in /var/www/nextcloud/apps/richdocumentscode/proxy.php on line 296 [Fri Oct 11 21:12:35.017129 2024] [php:warn] [pid 952:tid 952] [client 127.0.0.1:60412] PHP Warning: http_response_code(): Cannot set response code - headers already sent (output started at /var/www/nextcloud/apps/richdocumentscode/proxy.php:289) in /var/www/nextcloud/apps/richdocumentscode/proxy.php on line 296 [Fri Oct 11 21:12:35.058245 2024] [php:warn] [pid 955:tid 955] [client 127.0.0.1:60438] PHP Warning: http_response_code(): Cannot set response code - headers already sent (output started at /var/www/nextcloud/apps/richdocumentscode/proxy.php:289) in /var/www/nextcloud/apps/richdocumentscode/proxy.php on line 296 [Fri Oct 11 21:12:52.297829 2024] [php:warn] [pid 1648:tid 1648] [client 192.168.241.114:52196] PHP Warning: http_response_code(): Cannot set response code - headers already sent (output started at /var/www/nextcloud/apps/richdocumentscode/proxy.php:289) in /var/www/nextcloud/apps/richdocumentscode/proxy.php on line 296 [Fri Oct 11 21:12:52.343857 2024] [php:warn] [pid 1075:tid 1075] [client 192.168.241.114:52214] PHP Warning: http_response_code(): Cannot set response code - headers already sent (output started at /var/www/nextcloud/apps/richdocumentscode/proxy.php:289) in /var/www/nextcloud/apps/richdocumentscode/proxy.php on line 296 [Fri Oct 11 21:13:35.243662 2024] [php:warn] [pid 955:tid 955] [client 127.0.0.1:49072] PHP Warning: http_response_code(): Cannot set response code - headers already sent (output started at /var/www/nextcloud/apps/richdocumentscode/proxy.php:289) in /var/www/nextcloud/apps/richdocumentscode/proxy.php on line 296 [Fri Oct 11 21:13:35.286355 2024] [php:warn] [pid 957:tid 957] [client 127.0.0.1:49090] PHP Warning: http_response_code(): Cannot set response code - headers already sent (output started at /var/www/nextcloud/apps/richdocumentscode/proxy.php:289) in /var/www/nextcloud/apps/richdocumentscode/proxy.php on line 296 [Fri Oct 11 21:13:52.818719 2024] [php:warn] [pid 1075:tid 1075] [client 192.168.241.114:41398] PHP Warning: http_response_code(): Cannot set response code - headers already sent (output started at /var/www/nextcloud/apps/richdocumentscode/proxy.php:289) in /var/www/nextcloud/apps/richdocumentscode/proxy.php on line 296 [Fri Oct 11 21:13:52.866121 2024] [php:warn] [pid 1326:tid 1326] [client 192.168.241.114:41428] PHP Warning: http_response_code(): Cannot set response code - headers already sent (output started at /var/www/nextcloud/apps/richdocumentscode/proxy.php:289) in /var/www/nextcloud/apps/richdocumentscode/proxy.php on line 296 [Fri Oct 11 21:14:35.469759 2024] [php:warn] [pid 957:tid 957] [client 127.0.0.1:55310] PHP Warning: http_response_code(): Cannot set response code - headers already sent (output started at /var/www/nextcloud/apps/richdocumentscode/proxy.php:289) in /var/www/nextcloud/apps/richdocumentscode/proxy.php on line 296

[giox069]

As I just wrote into #270, the problem is that http_response_code() is called after some "print". The error is logged in webserver error log, but if you have display_errors enabled in php.ini, the error is sent with the browser response, and the browser can no longer proceed in opening documents.
My solution was to edit proxy.php, delete the two http_response_code(200) lines, and move the http_response_code(400) line before the print instructions. It seems to work. I could make a PR in the future, but I'm not an official devel.