Add HTML Template to improve visual output

2025-12-05 21:04:07 +00:00
parent c6efed07f5
commit 5a08f02e09
1 changed files with 56 additions and 9 deletions
--- a/src/main.go
+++ b/src/main.go
@@ -2,22 +2,69 @@ package main

 import (
 	"fmt"
+	"html/template"
+	"io"
 	"log"
 	"net/http"
 )

-func echoHandler(w http.ResponseWriter, r *http.Request) {
-	fmt.Fprintf(w, "%s %s\n", r.Method, r.URL.String())
+type EchoData struct {
+	Method  string
+	URL     string
+	Headers map[string][]string
+	Body    string
+}

-	fmt.Fprintln(w, "Headers:")
-	for name, values := range r.Header {
-		for _, value := range values {
-			fmt.Fprintf(w, "%s: %s\n", name, value)
-		}
+var echoTemplate = template.Must(template.New("echo").Parse(`
+<!DOCTYPE html>
+<html lang="en">
+<head>
+<meta charset="UTF-8">
+<title>Echo Server</title>
+<style>
+  body { font-family: monospace; }
+  .header { font-weight: bold; margin-top: 1em; }
+  pre {margin: 4px; }
+</style>
+</head>
+<body>
+<h2>{{.Method}} {{.URL}}</h2>
+
+<h3>Headers:</h3>
+
+{{- range $name, $values := .Headers}}
+<div class="header">{{$name}}</div>
+<pre>{{- range, $_, $v := $values}} {{$v}}
+{{- end}}</pre>
+
+{{- end}}
+
+<h3>Body:</h3>
+<pre>
+{{.Body}}
+</pre>
+</body>
+</html>
+`))
+
+func echoHandler(w http.ResponseWriter, r *http.Request) {
+	bodyBytes, err := io.ReadAll(r.Body)
+	if err != nil {
+		http.Error(w, "Failed to read body: "+err.Error(), http.StatusBadRequest)
+		return
+	}
+	r.Body.Close()
+	data := EchoData{
+		Method:  r.Method,
+		URL:     r.URL.String(),
+		Headers: r.Header,
+		Body:    string(bodyBytes),
 	}

-	fmt.Fprintln(w, "\nBody:")
-	r.Body.Close()
+	w.Header().Set("Content-Type", "text/html; charset=utf-8")
+	if err := echoTemplate.Execute(w, data); err != nil {
+		http.Error(w, fmt.Sprintf("Template error: %v", err), http.StatusInternalServerError)
+	}
 }

 func main() {