Does NGINX handle some error events / codes without them being set up in the config by default?

myNewAccount

12/25/22, 11:04 PM

Question: Are there some error events / codes that NGINX handles by default?

Background: The following portion of my config stops hotlinking and returns a 403 error.

    location ~* \.(jpg|png|svg|webp|ico)$ {
        valid_referers none blocked server_names ~\.bing\. ~\.duckduckgo\. ~\.facebook\. ~\.google\. ~\.instagram\. ~\.twitter\. ~\.yahoo\.;
        if ($invalid_referer) {
            return 403;
        }
    }

This section blocks unwanted HTTP methods and returns a 405 error.

if ($request_method !~ ^(GET|HEAD|POST)$) {
    return 405;
}

This got me thinking, are there any errors that I don't have to set up in NGINX?

For example, a 400 Bad Request error. Does NGINX know what a bad request is without adding an if statement and some logic to the config?

Alternately do I need to set up every error in the config that I plan to use and if I don't it can't be triggered? I always assumed this was the case but when I see how many different 400 and 500 errors there are I wonder if I'm not fully understanding this concept.

1 + 0

nginx

Score:2

Server

Martin Fjordvald

12/25/22, 11:29 PM

Nginx will handle everything except application level errors. A few examples would be

400 if the request breaks RFC specified format.
403 if nginx cannot read a file due to permission.
404 if the file isn't found.

And so on so forth, the only thing nginx doesn't handle is non-RFC requirements like your anti-hotlinking and things outside its scope such as fastcgi/uwsgi/http backends.

Basically don't worry about anything not related to your specific business logic.

0 + 2

myNewAccount

12/25/22, 11:34 PM

Awesome! On the 400 error example do I still need to include a location in my config so that when NGINX sees the error it knows what to send? For example, `error_page 400 /html/400.html;`

Martin Fjordvald

12/25/22, 11:39 PM

It has a simple default error page, see here: https://www.google.com/search?q=nginx+400+example&tbm=isch You can customise it to look nicer yes, but it's not required.

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: Does NGINX handle some error events / codes without them being set up in the config by default?

TH: NGINX จัดการกับเหตุการณ์ / รหัสข้อผิดพลาดบางอย่างโดยไม่ได้ตั้งค่าในการกำหนดค่าตามค่าเริ่มต้นหรือไม่

RO: NGINX gestionează unele evenimente/coduri de eroare fără ca acestea să fie configurate implicit în configurație?

RU: Обрабатывает ли NGINX некоторые события/коды ошибок без их настройки в конфигурации по умолчанию?

VI: NGINX có xử lý một số sự kiện/mã lỗi mà chúng không được thiết lập trong cấu hình theo mặc định không?

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