diff --git a/netty-http-server/src/main/java/org/xbib/netty/http/server/Server.java b/netty-http-server/src/main/java/org/xbib/netty/http/server/Server.java
index 2a52871..1bfe1cd 100644
--- a/netty-http-server/src/main/java/org/xbib/netty/http/server/Server.java
+++ b/netty-http-server/src/main/java/org/xbib/netty/http/server/Server.java
@@ -206,25 +206,28 @@ public final class Server implements AutoCloseable {
     }
 
     public URL getBaseURL(HttpHeaders headers) {
-        URL bindURL = serverConfig.getDefaultDomain().getHttpAddress().base();
-        String scheme = headers != null ? headers.get("x-forwarded-proto") : null;
-        if (scheme == null) {
-            scheme = bindURL.getScheme();
-        }
-        String host = headers != null ? headers.get("x-forwarded-host") : null;
-        if (host == null) {
-            host = headers != null ? headers.get("host") : null;
-            if (host == null) {
-                host = bindURL.getHost();
-            }
-        }
+        String scheme = null;
+        String host = null;
         String port = null;
-        if (host != null) {
-            host = stripPort(host);
-            port = extractPort(host);
-            if (port == null) {
-                port = bindURL.getPort() != null ? Integer.toString(bindURL.getPort()) : null;
+        if (headers == null) {
+            URL bindURL = serverConfig.getDefaultDomain().getHttpAddress().base();
+            scheme = bindURL.getScheme();
+            host = bindURL.getHost();
+            port = bindURL.getPort() != null ? Integer.toString(bindURL.getPort()) : null;
+        } else if (headers.get("host") != null) {
+            // proxy proto, host
+            scheme = headers.get("x-forwarded-proto");
+            if (scheme == null) {
+                scheme = "http";
             }
+            host = headers.get("x-forwarded-host");
+            if (host == null) {
+                host = headers.get("host");
+            }
+            port = extractPort(host);
+            host = stripPort(host);
+        } else {
+            throw new IllegalArgumentException("no host header in " + headers);
         }
         URL.Builder builder = URL.builder().scheme(scheme).host(host);
         if (port != null) {
@@ -338,7 +341,7 @@ public final class Server implements AutoCloseable {
     }
 
     private static String hostAndPort(URL url) {
-        return url == null ? null : url.getPort() != -1 ? url.getHost() + ":" + url.getPort() : url.getHost();
+        return url == null ? null : url.getPort() != null && url.getPort() != -1 ? url.getHost() + ":" + url.getPort() : url.getHost();
     }
 
     private HttpChannelInitializer findChannelInitializer(int majorVersion,
diff --git a/netty-http-server/src/test/java/org/xbib/netty/http/server/test/ContextURLTest.java b/netty-http-server/src/test/java/org/xbib/netty/http/server/test/ContextURLTest.java
index 8099f5a..02f4098 100644
--- a/netty-http-server/src/test/java/org/xbib/netty/http/server/test/ContextURLTest.java
+++ b/netty-http-server/src/test/java/org/xbib/netty/http/server/test/ContextURLTest.java
@@ -4,6 +4,7 @@ import io.netty.handler.codec.http.DefaultFullHttpRequest;
 import io.netty.handler.codec.http.HttpMethod;
 import io.netty.handler.codec.http.HttpVersion;
 import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
 import org.xbib.net.URL;
@@ -56,6 +57,7 @@ public class ContextURLTest {
         String contextPath1 = serverRequest1.getContextPath();
         assertEquals("/one", contextPath1);
         URL url1 = serverRequest1.getContextURL();
+        assertNotNull(url1);
         assertEquals("domain.one", url1.getHost());
         assertEquals("/one/", url1.getPath());
 
@@ -65,6 +67,7 @@ public class ContextURLTest {
         String contextPath2 = serverRequest2.getContextPath();
         assertEquals("/two", contextPath2);
         URL url2 = serverRequest2.getContextURL();
+        assertNotNull(url2);
         assertEquals("domain.two", url2.getHost());
         assertEquals("/two/", url2.getPath());