feat(http/h2c): h2c test server with a Dockerfile

- Implemented a basic HTTP/2 server that responds with "ok" to requests.
- Updated dev.compose.yml to include a service for it

cmd/h2c_test_server/Dockerfile

@@ -0,0 +1,18 @@
+FROM golang:1.25.5-alpine AS builder
+
+HEALTHCHECK NONE
+
+WORKDIR /src
+
+COPY go.mod go.sum ./
+COPY main.go ./
+
+RUN go build -o h2c_test_server main.go
+
+FROM scratch
+
+COPY --from=builder /src/h2c_test_server /app/run
+
+USER 1001:1001
+
+CMD ["/app/run"]

cmd/h2c_test_server/go.mod

@@ -0,0 +1,7 @@
+module github.com/yusing/godoxy/cmd/h2c_test_server
+
+go 1.25.5
+
+require golang.org/x/net v0.48.0
+
+require golang.org/x/text v0.32.0 // indirect

cmd/h2c_test_server/go.sum

@@ -0,0 +1,4 @@
+golang.org/x/net v0.48.0 h1:zyQRTTrjc33Lhh0fBgT/H3oZq9WuvRR5gPC70xpDiQU=
+golang.org/x/net v0.48.0/go.mod h1:+ndRgGjkh8FGtu1w1FGbEC31if4VrNVMuKTgcAAnQRY=
+golang.org/x/text v0.32.0 h1:ZD01bjUt1FQ9WJ0ClOL5vxgxOI/sVCNgX1YtKwcY0mU=
+golang.org/x/text v0.32.0/go.mod h1:o/rUWzghvpD5TXrTIBuJU77MTaN0ljMWE47kxGJQ7jY=

cmd/h2c_test_server/main.go

@@ -0,0 +1,26 @@
+package main
+
+import (
+	"log"
+	"net/http"
+
+	"golang.org/x/net/http2"
+	"golang.org/x/net/http2/h2c"
+)
+
+func main() {
+	handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusOK)
+		w.Write([]byte("ok"))
+	})
+
+	server := &http.Server{
+		Addr:    ":80",
+		Handler: h2c.NewHandler(handler, &http2.Server{}),
+	}
+
+	log.Println("H2C server listening on :8080")
+	if err := server.ListenAndServe(); err != nil && err != http.ErrServerClosed {
+		log.Fatalf("ListenAndServe: %v", err)
+	}
+}

dev.compose.yml

@@ -54,6 +54,15 @@ services:
       - USERS=user:$$2a$$10$$UdLYoJ5lgPsC0RKqYH/jMua7zIn0g9kPqWmhYayJYLaZQ/FTmH2/u # user:password
     labels:
       proxy.tinyauth.port: "3000"
+  h2c_test_server:
+    build:
+      context: cmd/h2c_test_server
+      dockerfile: Dockerfile
+    container_name: h2c_test
+    restart: unless-stopped
+    labels:
+      proxy.#1.scheme: h2c
+      proxy.#1.port: 80
 configs:
   parca:
     content: |