This is a FastCGI example server in Go.

nginx.conf

## FastCGI
server {
    location ~ /app.* {
        fastcgi_pass    127.0.0.1:9000;
        include         fastcgi_params;
    }
}

## Reverse Proxy (이 방식으로 하면 http.ListenAndServe로 해야함)
server {
    listen 80;
    # listen 443 ssl;
    server_name api.golang.org;
    
    location ~ / {
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $remote_addr;
        proxy_set_header Host $host;
        proxy_pass http://127.0.0.1:3000;
    }
}

server.go

package main

import (
        "fmt"
        "net/http"
        "net/http/fcgi"
        "net"
)

type FastCGIServer struct{}

func (s FastCGIServer) ServeHTTP(w http.ResponseWriter, req *http.Request) {
        w.Write([]byte("This is a FastCGI example server.\n"))
}

func main() {
        fmt.Println("Starting server...")
        l, _ := net.Listen("tcp", "127.0.0.1:9000")
        b := new(FastCGIServer)
        fcgi.Serve(l, b)
}

server2.go

// 아래처럼 HandleFunc를 등록해서도 처리가능

func main() {
        http.HandleFunc("/foo", fooHandler)

        l, err := net.Listen("tcp", "127.0.0.1:9000")
        if err != nil {
                panic(err)
        }
        fcgi.Serve(l, nil)
}

func fooHandler(w http.ResponseWriter, r *http.Request) {
        fmt.Fprintf(w, "Hello")
}