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Upstream: $upstream_cache_age variable. The variable reflects response age, including the time spent in the cache and the upstream response age as obtained from the "Age" header. If the response wasn't cached, the variable reflects the "Age" header of the upstream response. If the intended use case is to cache responses as per HTTP/1.1 caching model, the $upstream_cache_age variable can be used to provide the "Age" header with the "add_header" directive, such as: add_header Age $upstream_cache_age; This now removes the "Age" header if it was present. Further, the "expires" directives now removes the "Age" header if it was present in the response, as the "expires" directive assumes zero age when it adds "Expires" and "Cache-Control" headers.
author Maxim Dounin <mdounin@mdounin.ru>
date Thu, 18 Jul 2024 19:39:45 +0300
parents e3faa5fb7772
children
line wrap: on
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# Copyright (C) Igor Sysoev
# Copyright (C) Nginx, Inc.


echo $ngx_n "checking for $ngx_type ...$ngx_c"

cat << END >> $NGX_AUTOCONF_ERR

----------------------------------------
checking for $ngx_type

END

ngx_found=no

for ngx_try in $ngx_type $ngx_types
do

    cat << END > $NGX_AUTOTEST.c

#include <sys/types.h>
#include <signal.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <netinet/in.h>
$NGX_INCLUDE_INTTYPES_H

int main(void) {
    $ngx_try i = 0;
    return (int) i;
}

END

    ngx_test="$CC $CC_TEST_FLAGS $CC_AUX_FLAGS \
              -o $NGX_AUTOTEST $NGX_AUTOTEST.c $NGX_LD_OPT $ngx_feature_libs"

    eval "$ngx_test >> $NGX_AUTOCONF_ERR 2>&1"

    if [ -x $NGX_AUTOTEST ]; then
        if [ $ngx_try = $ngx_type ]; then
            echo " found"
            ngx_found=yes
        else
            echo ", $ngx_try used"
            ngx_found=$ngx_try
        fi
    fi

    if [ $ngx_found = no ]; then
        if [ $ngx_try = $ngx_type ]; then
            echo $ngx_n " $ngx_try not found$ngx_c"
        else
            echo $ngx_n ", $ngx_try not found$ngx_c"
        fi

        echo "----------"    >> $NGX_AUTOCONF_ERR
        cat $NGX_AUTOTEST.c  >> $NGX_AUTOCONF_ERR
        echo "----------"    >> $NGX_AUTOCONF_ERR
        echo $ngx_test       >> $NGX_AUTOCONF_ERR
        echo "----------"    >> $NGX_AUTOCONF_ERR
    fi

    rm -rf $NGX_AUTOTEST*

    if [ $ngx_found != no ]; then
        break
    fi
done

if [ $ngx_found = no ]; then
    echo
    echo "$0: error: can not define $ngx_type"

    exit 1
fi

if [ $ngx_found != yes ]; then
    echo "typedef $ngx_found  $ngx_type;"   >> $NGX_AUTO_CONFIG_H
fi