http2 support

Author: wlanboy

src/main/java/com/wlanboy/javahttpclient/client/ClientService.java

@@ -30,7 +30,7 @@ public class ClientService {
 
 	public ClientService() {
 		client = HttpClient.newBuilder()
-				.version(Version.HTTP_1_1)
+				.version(Version.HTTP_2)
 				.followRedirects(Redirect.NORMAL)
 				.connectTimeout(Duration.ofSeconds(10))
 				.build();
@@ -80,8 +80,13 @@ public ResponseEntity<String> sendRequest(JavaHttpRequest requestData, HttpHeade
 			HttpHeaders responseHeaders = new HttpHeaders();
 			response.headers().map().forEach(responseHeaders::addAll);
 
+			String protocolVersion = response.version() == Version.HTTP_2 ? "HTTP/2" : "HTTP/1.1";
+
 			return ResponseEntity.status(response.statusCode())
-					.headers(h -> h.addAll(responseHeaders))
+					.headers(h -> {
+						h.addAll(responseHeaders);
+						h.set("X-Protocol-Version", protocolVersion);
+					})
 					.body(response.body());
 
 		} catch (Exception e) {

src/main/resources/public/index.html

@@ -88,6 +88,7 @@
                     <div class="d-flex align-items-center justify-content-between mb-3">
                         <div>
                             <span id="statusBadge" class="badge fs-6 shadow-sm"></span>
+                            <span id="protocolBadge" class="badge bg-secondary ms-2 shadow-sm" style="display:none;"></span>
                             <span id="responseTime" class="ms-3 text-muted small fw-bold"></span>
                         </div>
                     </div>

src/main/resources/public/js/http-client.js

@@ -8,6 +8,7 @@ document.addEventListener('DOMContentLoaded', () => {
     const responseOutput = document.getElementById('responseOutput');
     const errorBox = document.getElementById('errorBox');
     const statusBadge = document.getElementById('statusBadge');
+    const protocolBadge = document.getElementById('protocolBadge');
     const responseTimeText = document.getElementById('responseTime');
     const stacktraceArea = document.getElementById('stacktraceArea');
     const toggleStackBtn = document.getElementById('toggleStackBtn');
@@ -75,8 +76,9 @@ document.addEventListener('DOMContentLoaded', () => {
 
             const duration = Date.now() - startTime;
             const data = await response.text();
+            const protocol = response.headers.get('x-protocol-version') ?? '';
 
-            updateResponseMetadata(response.status, duration);
+            updateResponseMetadata(response.status, duration, protocol);
             addToHistory(payload, response.status, duration, data);
 
             if (response.status === 502 && data.includes("---STACKTRACE---")) {
@@ -127,10 +129,15 @@ document.addEventListener('DOMContentLoaded', () => {
         if (toggleStackBtn) toggleStackBtn.textContent = 'Stacktrace Details';
     }
 
-    function updateResponseMetadata(status, duration) {
+    function updateResponseMetadata(status, duration, protocol = '') {
         statusBadge.innerText = `HTTP ${status}`;
         statusBadge.className = `badge p-2 ${status >= 200 && status < 300 ? 'bg-success' : 'bg-danger'}`;
         responseTimeText.innerText = `Dauer: ${duration}ms`;
+        if (protocol && protocolBadge) {
+            protocolBadge.innerText = protocol;
+            protocolBadge.className = `badge ms-2 shadow-sm ${protocol === 'HTTP/2' ? 'bg-primary' : 'bg-secondary'}`;
+            protocolBadge.style.display = '';
+        }
     }
 
     function handleDetailedError(data) {