[Nginx] 4xx and 5xx retain custom Headers

[Nginx] 4xx and 5xx retain custom Headers
Problem

If the status code returned by the request is 404 or 50x, the custom header is still returned.

Analysis and Solution

The add_header section in the nginx document contains the following sentence:

Adds the specified field to a response header provided that the response code equals 200,201,204,206,301,302,303,304, or 307. A value can contain variables.

That is to say, add_header generally does not apply to 4xx and 5xx responses.

However, you can use the always keyword after version 1.7.5. Let's test it.

Configuration snippets

    location /hello {        add_header Access-Control-Allow-Origin * always;        return 404;    }

Test Results

curl -i http://127.0.0.1:9999/helloHTTP/1.1 404 Not FoundServer: openresty/1.9.3.1Date: Mon, 01 Feb 2016 11:17:59 GMTContent-Type: text/htmlContent-Length: 174Connection: keep-aliveAccess-Control-Allow-Origin: *

The test is successful.

Expansion module

You can also use headers-more-nginx-module written by chunge to do things. For more information, see the documentation.

REF http://serverfault.com/questions/418709/nginx-add-header-for-a-50-page