Improve error handling by returning appropriate HTTP status codes

[0xSysR3ll]

Prerequisites

• I have searched for duplicate or closed feature requests
• I have searched for plugins that provide already provide the feature

Proposal

Hello,

I don't know if it's already been mentioned or if it's deliberate not to implement it this way but.

Currently, when a file is not found (e.g., a missing template or resource), Roundcube displays an error page with a message such as:

FILE NOT FOUND
The requested resource was not found!
Please contact your server-administrator.

However, the server still responds with an HTTP status code of 200 OK.
This behavior can mislead monitoring systems and end-users, as it does not reflect the actual error condition.

I propose enhancing the error handling logic to return a 404 Not Found HTTP status code for missing files or resources instead of 200 OK.
This adjustment would ensure the response accurately represents the error state.

Motivation and context

Returning a 404 Not Found status for missing files instead of 200 OK would make it easier for monitoring tools to detect and classify errors accurately.

[alecpl]

This might be as simple as adding http_response_code($HTTP_ERR_CODE); somewhere in program/actions/utils/error.php.

[0xSysR3ll]

Yes, that's exactly what I was thinking!