[PATCH] HTTP: NGINX_VER_BUILD in Server header and error page tail.

[Tom Thorogood]

Hi,

This patch adds a build option to the server_tokens directive. When build is specified the Server header will have a value of NGINX_VER_BUILD. Also the tail of built in error pages will be NGINX_VER_BUILD. off and on are retained as valid values and behave as they always have.

This makes it possible to specify semi-custom server tokens of the form "nginx/<version> (<value>)". <value> is specified with the --build flag for ./configure.

A potential use case is including the name of a custom build for example with --build="super-nginx/0.1". This would give: nginx/1.9.15 (super-nginx/0.1).

Another potential use case of this feature is to include the git revision of a parent build with --build="`git rev-parse --short HEAD`". This would give: nginx/1.9.15 (c3ebabd). In that case the feature can be used to enhance troubleshooting and/or provide more information to end users.

Kind Regards,
Tom Thorogood.
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