问是否可以使用nginx location指令发送http请求？

EN

# pick your location 

location /example {

    # invite lua to the party

    access_by_lua_block  {

        # set request parameters

        local request = {
            v = 1,
            t = "pageview",

            # don' forget to put your own property here

            tid = "UA-XXXXXXX-Y",

            # this is a "unique" user id based on a hash of ip and user agent, not too reliable but possibly best that one can reasonably do without cookies

            cid = ngx.md5(ngx.var.remote_addr .. ngx.var.http_user_agent),
            uip = ngx.var.remote_addr,
            dp = ngx.var.request_uri,
            dr = ngx.var.http_referer,
            ua = ngx.var.http_user_agent,

            # here you truncate the language string to make it compatible with the javascript format - you'll want either the first two characters like here (e.g. en) or the first five (e.g en_US) with ...1, 5

            ul = string.sub(ngx.var.http_accept_language, 1, 2)
            }

        # use the location.capture thingy to send everything to a proxy

        local res = ngx.location.capture(  "/gamp",  {
        method = ngx.HTTP_POST,
        body = ngx.encode_args(request)
        })
    }
}


# make a separate location block to proxy the request away

location = /gamp {
    internal;
    expires epoch;
    access_log off;
    proxy_pass_request_headers off;
    proxy_pass_request_body on;
    proxy_pass https://google-analytics.com/collect;
}

location / {
          access_by_lua_block  {
            os.execute("/usr/bin/curl --data 'v=1&t=pageview&tid=UA-XXXXXXXX-X&cid=123&dp=hit'  https://google-analytics.com/collect >/dev/null 2>/dev/null") 
        }
}

>/dev/null 2>/dev/null &")

sub_filter_once on;

sub_filter '</body>' "<script>
(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
})(window,document,'script','https://www.google-analytics.com/analytics.js','ga');

ga('create', 'UA-XXXXXXXX-X', 'auto');
ga('send', 'pageview');
</script></body>";

location / {
}