pass request to application server after getting response from remote server

sunny.k · 2015-09-10T16:45:17+00:00

I'm try to edit proxy_cache_valid expires is smaller. Then i'm seeing +when proxy_cache_valid expires, $upstream_cache_status is EXPIRES then pass re...

pass request to application server after getting response from remote server

sunny.k

Here is a thing :

Server (name) Response

A (remote server) body in json

B - app server(port 8000 localhost) that normally deal with all request and serve pages

Nginx with port : 8080

FIRST request -----------------> proxy_pass using "location.capture" to server A and get response body -------------------> proxy_pass again to app_server running on local at 8080 with all FIRST request body and resources.

Note : I wanted to capture every new request to remote server for processing purpose and then by passing to app server.

location /somepage {
            content_by_lua_file ./lua/nginx_ss.lua;
        }

location /v1/secure/proxy_remote_server/ {
            internal;
            resolver 8.8.8.8;

            proxy_set_header HOST $host;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

            proxy_pass   http://remote_server/api/v1/ssjs;
        }

location /v1/app/ {
            internal;
            resolver 8.8.8.8;
            #original request access url to app server for fetching webpage n other things
            proxy_pass   http://127.0.0.1:8000/{with url};
        }

Nginx.conf

local final_json = somedata_in_string;
local res = ngx.location.capture("/v1/secure/proxy_remote_server/", { method = ngx.HTTP_POST, body = final_json });

###### now after getting response i wanted to forward request to app_server

local resp_app = ngx.location.capture("/v1/app/", { body = res.body});

ngx.say("body :", resp_app.body);

nginx_ss.lua

My problem :

How to not loose the original data body (if it is POST request) n other resources and bypassing to appserver after remote server response.
How to make sure every access to new page at app server post a request to remote server ie, goes through nginx_ss.lua.
how to not loose the original path accessed so that i can pass request to app server. suppose : we have defined location block in nginx.conf. but we also have route at backend app like below.
@app.route('/') def index(): return render_template('redr.html') @app.route('/page') def render_page(): return render_template('web.html') @app.route('/data') def names(): data = "" ["John", "Jacob", "Julie", "Jennifer"]} return jsonify(data) #Running at 8000 port.

In short , i need an architecture that catches every request n send to remote server and after that it goes to app server to get webpage. thanks!

nguyennhatkhang2704

Hello !
I think this https://github.com/pintsized/lua-resty-http may help you.