nginx [emerg] invalid host in upstream

[Sunny GUPTA]

#### nginx.conf

http {

    lua_package_path "./lua/?.lua;;";

    resolver 8.8.8.8;

    #Basic reverse proxy server

    upstream backend{

        server  http://0.0.0.0:5000/api/v1/ssjs; #some remote server

    }

    server {

        listen 8080;

        lua_code_cache off; # for development only

        location / {

            content_by_lua_file ./lua/nginx_ss.lua;

        }

        #Proxy_pass the request to remote server

        location /v1/secure/proxy_shield_square/ {

            internal;

            resolver 8.8.8.8;

            #### Any remote server end-point

            proxy_set_header HOST $host;

            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

            proxy_pass   http://backend;

            #proxy_pass  http://some.remoteserver.com/serverendpoint;

            # http://0.0.0.0:5000/api/v1/ssjs;

        }

    }


#in nginx_ss.lua file . I am catching incoming req making some changes in header, setting new body and passing to location.capture 
# /v1/secure/proxy_shield_square/ that is supposed to proxy pass my request to remote server

#############################################
# this is nginx_ss.lua 

# body preparation as string in json format

local final_json = table.concat(api_table);

--ngx.print(final_json);

ngx.req.read_body();

local res = ngx.location.capture("/v1/secure/proxy_shield_square/", { body = final_json });

ngx.say("\n\n--------Response Headers from Remote server-------------");

ngx.say("status : ", res.status);

ngx.say("method : ", res.method);

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

for k,v in pairs(res.header) do

    ngx.say(k,'-', v);

end

##################################################

Command to reload nginx conf

$ nginx -p `pwd` -s reload

nginx: [emerg] invalid host in upstream "http://0.0.0.0:5000/api/v1/ssjs" in /home/lautner/CodeCave/open_nginx/conf/nginx.conf:15

Is there is something wrong i am doing right now?
when i proxy_pass directly this http://0.0.0.0:5000/api/v1/ssjs , i am getting all request at this running server locally. 
but when using upstream directive, it throwing this above error. Please someone having this knowledge regarding this issue, help me out? Thanks%

[DeJiang Zhu]

Hi,

http://nginx.org/en/docs/http/ngx_http_upstream_module.html#upstream

You can try like this:

upstream backend {

    server 0.0.0.0:5000;

}

proxy_pass http://backend/api/v1/ss.js;

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[Sunny GUPTA]

Thanks DeJiang, its working now.. But what about my actual server endpoint. that is something like http://servername.com/getdata ; do i need to mention the ip address of that server_name that correspond to that server?