Nginx - How to add multiple values to header

Question

I have a header that is not taking in nginx. Say I have a header such as Strict-Transport-Securty.

add_header Strict-Transport-Security    'max-age=31536000; preload'  always;

Should max-age and preload be separated by a semi-colon and a space? No space? Commas only? How do I include multiple values? The add_header nginx docs don't mention this.

Andrew Richards · Accepted Answer · 2025-08-28 13:22:47Z

2

A semicolon is the correct way of separating Strict-Transport-Securty header values. Your line

add_header Strict-Transport-Security 'max-age=31536000; preload' always;

is correct.

You probably weren't able to find it in the Nginx docs because this is standardized in the IETF specification:

Strict-Transport-Security = "Strict-Transport-Security" ":"
                            [ directive ]  *( ";" [ directive ] )

See here: https://www.rfc-editor.org/rfc/rfc6797#section-6.1

edited Aug 28 at 13:22

Andrew Richards

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answered Sep 3, 2019 at 15:26

NullDev

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