Adds the specified field to a response header provided that the response code equals 200, 201 (1.3.10), 204, 206, 301, 302, 303, 304, 307 (1.1.16, 1.0.13), or 308 (1.13.0). Parameter value can contain variables. There could be several add_header directives. These directives are inherited from the previous configuration level if and only if there are no add_header directives defined on the current
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