Added IP Resolve of DNS

Author: wlanboy

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

@@ -2,6 +2,7 @@
 
 import java.io.PrintWriter;
 import java.io.StringWriter;
+import java.net.InetAddress;
 import java.net.URI;
 import java.net.http.HttpClient;
 import java.net.http.HttpClient.Redirect;
@@ -50,6 +51,9 @@ public ResponseEntity<String> sendRequest(JavaHttpRequest requestData, HttpHeade
 			String currentMethod = requestData.method().name();
 			String currentBody = requestData.body();
 
+			// DNS-Auflösung vor dem Request (diagnostisch)
+			String resolvedIps = resolveDns(currentUri.getHost());
+
 			// Erster Request mit allen Headern
 			HttpResponse<String> response = client.send(
 					buildRequest(currentUri, currentMethod, currentBody, requestData, incomingHeaders),
@@ -90,6 +94,7 @@ public ResponseEntity<String> sendRequest(JavaHttpRequest requestData, HttpHeade
 					.headers(h -> {
 						h.addAll(responseHeaders);
 						h.set("X-Protocol-Version", protocolVersion);
+						if (resolvedIps != null) h.set("X-Resolved-IP", resolvedIps);
 						if (!redirectChain.isEmpty()) {
 							h.set("X-Redirect-Chain", serializeChain(redirectChain));
 						}
@@ -153,6 +158,19 @@ private HttpRequest buildRequest(URI uri, String method, String body,
 		return builder.build();
 	}
 
+	private String resolveDns(String hostname) {
+		if (hostname == null || hostname.isBlank()) return null;
+		try {
+			InetAddress[] addresses = InetAddress.getAllByName(hostname);
+			return java.util.Arrays.stream(addresses)
+					.map(InetAddress::getHostAddress)
+					.distinct()
+					.collect(java.util.stream.Collectors.joining(", "));
+		} catch (Exception e) {
+			return null;
+		}
+	}
+
 	private String serializeChain(List<Map<String, Object>> chain) {
 		StringBuilder sb = new StringBuilder("[");
 		for (int i = 0; i < chain.size(); i++) {

src/main/resources/public/index.html

@@ -89,6 +89,7 @@
                         <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="resolvedIpBadge" class="badge bg-dark ms-2 shadow-sm font-monospace" style="display:none;" title="Aufgelöste IP(s)"></span>
                             <span id="responseTime" class="ms-3 text-muted small fw-bold"></span>
                         </div>
                     </div>

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

@@ -78,9 +78,10 @@ document.addEventListener('DOMContentLoaded', () => {
             const duration = Date.now() - startTime;
             const data = await response.text();
             const protocol = response.headers.get('x-protocol-version') ?? '';
+            const resolvedIp = response.headers.get('x-resolved-ip') ?? '';
             const redirectChainHeader = response.headers.get('x-redirect-chain');
 
-            updateResponseMetadata(response.status, duration, protocol);
+            updateResponseMetadata(response.status, duration, protocol, resolvedIp);
             renderRedirectChain(redirectChainHeader);
             addToHistory(payload, response.status, duration, data);
 
@@ -163,7 +164,7 @@ document.addEventListener('DOMContentLoaded', () => {
         redirectChainDiv.style.display = 'block';
     }
 
-    function updateResponseMetadata(status, duration, protocol = '') {
+    function updateResponseMetadata(status, duration, protocol = '', resolvedIp = '') {
         statusBadge.innerText = `HTTP ${status}`;
         statusBadge.className = `badge p-2 ${status >= 200 && status < 300 ? 'bg-success' : 'bg-danger'}`;
         responseTimeText.innerText = `Dauer: ${duration}ms`;
@@ -172,6 +173,15 @@ document.addEventListener('DOMContentLoaded', () => {
             protocolBadge.className = `badge ms-2 shadow-sm ${protocol === 'HTTP/2' ? 'bg-primary' : 'bg-secondary'}`;
             protocolBadge.style.display = '';
         }
+        const ipBadge = document.getElementById('resolvedIpBadge');
+        if (ipBadge) {
+            if (resolvedIp) {
+                ipBadge.innerText = resolvedIp;
+                ipBadge.style.display = '';
+            } else {
+                ipBadge.style.display = 'none';
+            }
+        }
     }
 
     function handleDetailedError(data) {