lua-resty-http behavior on redirection

gistfile1.txt

# nginx.conf snippet:
    location /test_redirection {
        content_by_lua '
                local http = require "http";
                function get_req(httpc, base_uri, path)
                        local uri = base_uri .. path
                        ngx.log(ngx.DEBUG, "Requesting ", uri)
                        local res, err = httpc:request_uri(uri, {method = "GET", ssl_verify=false})
                        if not res then
                                error("Failed to request ", uri, " err: ", err)
                        end
                        if res.status == 302 then
                                local new_uri = res.headers["Location"]
                                ngx.log(ngx.DEBUG, "Redirecting to ", new_uri)
                                local slash_pos = string.find(new_uri, "/", 10)
                                local new_base_uri = string.sub(new_uri, 1, slash_pos)
                                local new_path = string.sub(new_uri, slash_pos+1)
                                return get_req(httpc, new_base_uri, new_path)
                        end
                        if res.status ~= 200 then
                                error("Error when requesting ", url)
                        end
                        ngx.say(res.body)
                        return base_uri
                end

                local base_uri = "http://192.168.2.143/"
                local httpc = http.new()
                for i,v in ipairs({"one", "two", "three", "four", "five", "six", "seven"}) do
                        base_uri = get_req(httpc, base_uri, v)
                end
        ';
    }


# node.js server:

# cat my_http_server_with_close.js 

var http = require('http');
 
var s1 = http.createServer(function (req, res) {
	console.log("Server(80) request arrived for ", req.url);
	if(req.url == "/four") {
		res.writeHead(302, {'Location': 'http://192.168.2.143:8080/FOUR', 'Connection': 'close'});
		res.end();
	} else {
		res.writeHead(200, {'Content-Type': 'text/plain'});
		res.end(req.url + "\r\n");
	}
}).listen(80);

s1.on('connection', function(socket) {
	console.log("New connection" + socket);
});	
	

var s2 = http.createServer(function (req, res) {
	console.log("Server(8080) request arrived for ", req.url);
	res.writeHead(200, {'Content-Type': 'text/plain'});
	res.end(req.url + "\r\n");
}).listen(8080);

s2.on('connection', function(socket) {
	console.log("New connection" + socket);
});	


# making the request:
$ curl -x "" http://192.168.2.142/test_redirection

# ... i get:
$ node my_http_server_with_close.js 
New connection[object Object]
Server(80) request arrived for  /one
Server(80) request arrived for  /two
Server(80) request arrived for  /three
Server(80) request arrived for  /four
New connection[object Object]
Server(8080) request arrived for  /FOUR
New connection[object Object]
Server(8080) request arrived for  /five
New connection[object Object]
Server(8080) request arrived for  /six
New connection[object Object]
Server(8080) request arrived for  /seven


# ngrep output

interface: any
match: HTTP

T 192.168.2.142:38472 -> 192.168.2.142:80 [AP]
GET /test_redirection HTTP/1.1.
User-Agent: curl/7.19.7 (x86_64-redhat-linux-gnu) libcurl/7.19.7 NSS/3.14.0.0 zlib/1.2.3 libidn/1.18 libssh2/1.4.2.
Host: 192.168.2.142.
Accept: */*.
.


T 192.168.2.142:50675 -> 192.168.2.143:80 [AP]
GET /one HTTP/1.1.
Host: 192.168.2.143.
User-Agent: Resty/HTTP 0.03 (Lua).
.


T 192.168.2.143:80 -> 192.168.2.142:50675 [AP]
HTTP/1.1 200 OK.
Content-Type: text/plain.
Date: Wed, 10 Sep 2014 02:14:08 GMT.
Connection: keep-alive.
Transfer-Encoding: chunked.
.
6.
/one.
.
0.
.


T 192.168.2.142:50675 -> 192.168.2.143:80 [AP]
GET /two HTTP/1.1.
Host: 192.168.2.143.
User-Agent: Resty/HTTP 0.03 (Lua).
.


T 192.168.2.143:80 -> 192.168.2.142:50675 [AP]
HTTP/1.1 200 OK.
Content-Type: text/plain.
Date: Wed, 10 Sep 2014 02:14:08 GMT.
Connection: keep-alive.
Transfer-Encoding: chunked.
.
6.
/two.
.
0.
.


T 192.168.2.142:50675 -> 192.168.2.143:80 [AP]
GET /three HTTP/1.1.
Host: 192.168.2.143.
User-Agent: Resty/HTTP 0.03 (Lua).
.


T 192.168.2.143:80 -> 192.168.2.142:50675 [AP]
HTTP/1.1 200 OK.
Content-Type: text/plain.
Date: Wed, 10 Sep 2014 02:14:08 GMT.
Connection: keep-alive.
Transfer-Encoding: chunked.
.
8.
/three.
.
0.
.


T 192.168.2.142:50675 -> 192.168.2.143:80 [AP]
GET /four HTTP/1.1.
Host: 192.168.2.143.
User-Agent: Resty/HTTP 0.03 (Lua).
.


T 192.168.2.143:80 -> 192.168.2.142:50675 [AP]
HTTP/1.1 302 Moved Temporarily.
Location: http://192.168.2.143:8080/FOUR.
Connection: close.
Date: Wed, 10 Sep 2014 02:14:08 GMT.
Transfer-Encoding: chunked.
.
0.
.


T 192.168.2.142:37510 -> 192.168.2.143:8080 [AP]
GET /FOUR HTTP/1.1.
Host: 192.168.2.143.
User-Agent: Resty/HTTP 0.03 (Lua).
.


T 192.168.2.143:8080 -> 192.168.2.142:37510 [AP]
HTTP/1.1 200 OK.
Content-Type: text/plain.
Date: Wed, 10 Sep 2014 02:14:08 GMT.
Connection: keep-alive.
Transfer-Encoding: chunked.
.
7.
/FOUR.
.
0.
.


T 192.168.2.142:37511 -> 192.168.2.143:8080 [AP]
GET /five HTTP/1.1.
Host: 192.168.2.143.
User-Agent: Resty/HTTP 0.03 (Lua).
.


T 192.168.2.143:8080 -> 192.168.2.142:37511 [AP]
HTTP/1.1 200 OK.
Content-Type: text/plain.
Date: Wed, 10 Sep 2014 02:14:08 GMT.
Connection: keep-alive.
Transfer-Encoding: chunked.
.
7.
/five.
.
0.
.


T 192.168.2.142:37512 -> 192.168.2.143:8080 [AP]
GET /six HTTP/1.1.
Host: 192.168.2.143.
User-Agent: Resty/HTTP 0.03 (Lua).
.


T 192.168.2.143:8080 -> 192.168.2.142:37512 [AP]
HTTP/1.1 200 OK.
Content-Type: text/plain.
Date: Wed, 10 Sep 2014 02:14:08 GMT.
Connection: keep-alive.
Transfer-Encoding: chunked.
.
6.
/six.
.
0.
.


T 192.168.2.142:37513 -> 192.168.2.143:8080 [AP]
GET /seven HTTP/1.1.
Host: 192.168.2.143.
User-Agent: Resty/HTTP 0.03 (Lua).
.


T 192.168.2.143:8080 -> 192.168.2.142:37513 [AP]
HTTP/1.1 200 OK.
Content-Type: text/plain.
Date: Wed, 10 Sep 2014 02:14:08 GMT.
Connection: keep-alive.
Transfer-Encoding: chunked.
.
8.
/seven.
.
0.
.


T 192.168.2.142:80 -> 192.168.2.142:38472 [AP]
HTTP/1.1 200 OK.
Server: openresty/1.7.4.1rc1.3.
Date: Wed, 10 Sep 2014 02:14:08 GMT.
Content-Type: text/plain.
Transfer-Encoding: chunked.
Connection: keep-alive.
.
7.
/one.

.
7.
/two.

.
9.
/three.

.
8.
/FOUR.

.
8.
/five.

.
7.
/six.

.
9.
/seven.

.
0.
.