Pass POST data to unix domain socket through nginx - nginx

Question

I have a unix domain socket file and it is working with with nc command. Now I want to access it via nginx but it does not work. Am I missing something?
test with nc => it works
$ echo '{ "method" : "getinfo", "params" : [], "id" : "1" }' | nc -U /home/zono/.lightning/lightning-rpc
{ "jsonrpc": "2.0", "id" : "1", "result" :
{
"id": "xxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
}
test via nginx => it does not work
// /etc/nginx/sites-enabled/default
upstream nginx-internal-sock {
server unix:/home/zono/.lightning/lightning-rpc;
}
server {
listen 80;
location / {
proxy_pass http://nginx-internal-sock;
}
}
$ curl -H "content-type: application/json" -X POST --data '{ "method" : "getinfo", "params" : [], "id" : "1" }' http://127.0.0.1
2019-03-20T04:25:52.551Z lightningd(30143):jcon fd 32: Invalid token in json input: 'POST / HTTP/1.0??Host: nginx-internal-sock??Connection: close??C'
Update 1
There's been a development. However I can't get whole data.
// install nginx-extras
apt-get install nginx-extras
// /etc/nginx/sites-enabled/default
server {
listen 80;
location / {
content_by_lua '
ngx.req.read_body()
local body_data = ngx.req.get_body_data()
local sock = ngx.socket.tcp()
local ok, err = sock:connect("unix:/home/zono/.lightning/lightning-rpc")
local bytes = sock:send(body_data)
local line, err = sock:receive("*a")
ngx.say(line)
ok, err = sock:close()
';
}
}
// Response is nil
$ curl -X POST --data '{ "method" : "getinfo", "params" : [], "id" : "1" }' http://127.0.0.1
nil
// /var/log/nginx/error.log
2019/03/20 07:43:39 [error] 4926#4926: *35 lua tcp socket read timed out, client: 127.0.0.1, server: , request: "POST / HTTP/1.1", host: "127.0.0.1"
// When I set "sock:receive("*l")" the response is the part of the data.
$ curl -X POST --data '{ "method" : "getinfo", "params" : [], "id" : "1" }' http://127.0.0.1
{ "jsonrpc": "2.0", "id" : "1", "result" :
I'm checking the reference now. http://w3.impa.br/~diego/software/luasocket/tcp.html
'*a': reads from the socket until the connection is closed. No end-of-line translation is performed;
'*l': reads a line of text from the socket. The line is terminated by a LF character (ASCII 10), optionally preceded by a CR character (ASCII 13). The CR and LF characters are not included in the returned line. In fact, all CR characters are ignored by the pattern. This is the default pattern;
number: causes the method to read a specified number of bytes from the socket.

Answer 1

I found out the answer.
// install nginx-extras
apt-get install nginx-extras
// /etc/nginx/sites-enabled/default
server {
listen 80;
location / {
content_by_lua '
ngx.req.read_body()
local body_data = ngx.req.get_body_data()
local sock = ngx.socket.tcp()
local ok, err = sock:connect("unix:/home/zono/.lightning/lightning-rpc")
local bytes = sock:send(body_data)
local readline = sock:receiveuntil("\\n\\n")
local line, err, part = readline()
if line then
ngx.say(line)
end
ok, err = sock:close()
';
}
}
// curl
$ curl -X POST --data '{ "method" : "getinfo", "params" : [], "id" : "1" }' http://127.0.0.1