diff --git a/comment.go b/comment.go
new file mode 100644
index 0000000..1cbdacb
--- /dev/null
+++ b/comment.go
@@ -0,0 +1,53 @@
+package main
+
+import (
+	"bytes"
+	"crypto/rand"
+	"encoding/hex"
+	"encoding/json"
+	"fmt"
+	"net/http"
+)
+
+// GenerateIdempotencyKey 生成一个随机的幂等键，用于 POST 请求防止重复提交。
+// 返回 16 字节的十六进制字符串。
+func GenerateIdempotencyKey() (string, error) {
+	b := make([]byte, 16)
+	_, err := rand.Read(b)
+	if err != nil {
+		return "", fmt.Errorf("failed to generate idempotency key: %w", err)
+	}
+	return hex.EncodeToString(b), nil
+}
+
+// setIdempotencyHeader 向 HTTP 请求中添加幂等键头。
+func setIdempotencyHeader(req *http.Request) error {
+	key, err := GenerateIdempotencyKey()
+	if err != nil {
+		return err
+	}
+	req.Header.Set("X-GitHub-Idempotency-Key", key)
+	return nil
+}
+
+// PostComment 向指定 URL 发送 POST 请求，自动生成并添加幂等键。
+// body 将被序列化为 JSON。返回 HTTP 响应和可能的错误。
+func PostComment(client *http.Client, url string, body interface{}) (*http.Response, error) {
+	jsonBody, err := json.Marshal(body)
+	if err != nil {
+		return nil, fmt.Errorf("failed to marshal body: %w", err)
+	}
+
+	req, err := http.NewRequest("POST", url, bytes.NewReader(jsonBody))
+	if err != nil {
+		return nil, fmt.Errorf("failed to create request: %w", err)
+	}
+	req.Header.Set("Content-Type", "application/json")
+
+	// 添加幂等键头
+	if err := setIdempotencyHeader(req); err != nil {
+		return nil, fmt.Errorf("failed to set idempotency key: %w", err)
+	}
+
+	return client.Do(req)
+}
diff --git a/main.go b/main.go
index 49f4dee..edc2f92 100644
--- a/main.go
+++ b/main.go
@@ -1,7 +1,27 @@
 package main
 
-import "fmt"
+import (
+	"fmt"
+	"log"
+	"net/http"
+	"time"
+)
 
 func main() {
 	fmt.Println("Hello, Bounty Hunter!")
+
+	// 演示使用幂等键发送评论 POST 请求
+	// 实际使用时，请替换为真实的 GitHub API 评论 URL 和 Token
+	client := &http.Client{Timeout: 10 * time.Second}
+	commentBody := map[string]string{"body": "This is a test comment with idempotency key."}
+	url := "https://api.github.com/repos/owner/repo/issues/1/comments"
+
+	resp, err := PostComment(client, url, commentBody)
+	if err != nil {
+		log.Printf("Failed to post comment: %v", err)
+		return
+	}
+	defer resp.Body.Close()
+
+	fmt.Printf("Comment posted, status: %s\n", resp.Status)
 }