Initial commit working so far, without cookie support

go.mod

@@ -0,0 +1,3 @@
+module github.com/pablu23/domain-router
+
+go 1.22.3

main.go

@@ -0,0 +1,93 @@
+package main
+
+import (
+	"errors"
+	"fmt"
+	"io"
+	"net/http"
+)
+
+func main() {
+	domains := make(map[string]int)
+	domains["test.localhost"] = 8181
+	domains["test2.localhost"] = 8282
+
+	client := &http.Client{
+		CheckRedirect: func(req *http.Request, via []*http.Request) error {
+			return http.ErrUseLastResponse
+		},
+	}
+
+	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
+		port := domains[r.Host]
+		fmt.Printf("Received request on Port: %d\n", port)
+		// logRequest(*r)
+
+		subUrlPath := r.URL.RequestURI()
+		req, err := http.NewRequest(r.Method, fmt.Sprintf("http://localhost:%d%s", port, subUrlPath), r.Body)
+		if err != nil {
+			panic(err)
+		}
+		// logRequest(*req)
+		for _, cookie := range r.Cookies() {
+			fmt.Printf("Setting cookie, Name: %s, Value: %s\n", cookie.Name, cookie.Value)
+			req.AddCookie(cookie)
+		}
+
+		// fmt.Println("Sending request to nested server")
+		res, err := client.Do(req)
+		if err != nil {
+			panic(err)
+		}
+		if loc, err := res.Location(); !errors.Is(err, http.ErrNoLocation) {
+			http.Redirect(w, r, loc.RequestURI(), http.StatusFound)
+			return
+		}
+
+		for _, cookie := range res.Cookies() {
+			fmt.Printf("Setting cookie, Name: %s, Value: %s\n", cookie.Name, cookie.Value)
+			http.SetCookie(w, cookie)
+		}
+
+		for name, values := range res.Header {
+			for _, value := range values {
+				// fmt.Printf("Adding Header vor name: %s, value: %s\n", name, value)
+				w.Header().Set(name, value)
+			}
+		}
+		w.WriteHeader(res.StatusCode)
+
+		// fmt.Println("Reading Body")
+		body, err := io.ReadAll(res.Body)
+		if err != nil {
+			panic(err)
+		}
+		defer res.Body.Close()
+		// fmt.Printf("Body: %s\n", hex.EncodeToString(body))
+
+		_, err = w.Write(body)
+		if err != nil {
+			panic(err)
+		}
+		fmt.Println("----------------------------------------")
+	})
+
+	fmt.Println("Starting server on :80")
+	http.ListenAndServe(":80", nil)
+}
+
+func logRequest(r http.Request) {
+	fmt.Printf("URL: %s %s\n", r.Method, r.URL)
+	fmt.Println("HEADER: ")
+	for name, values := range r.Header {
+		for _, value := range values {
+			fmt.Printf("%s: %s\n", name, value)
+			// w.Header().Set(name, value)
+		}
+	}
+	rbody, err := io.ReadAll(r.Body)
+	if err != nil {
+		panic(err)
+	}
+	fmt.Printf("BODY: %s\n", rbody)
+}