From 2c90dbf748ec3180842cfb6ec420598c56a3b58d Mon Sep 17 00:00:00 2001
From: Nicola Ferraro <ni.ferraro@gmail.com>
Date: Wed, 15 Apr 2020 18:37:49 +0200
Subject: [PATCH] Backport fix for
 https://github.com/apache/camel-k-runtime/issues/301 into
 camel-platform-http-vertx

---
 .../http/vertx/VertxPlatformHttpSupport.java    | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/components/camel-platform-http-vertx/src/main/java/org/apache/camel/component/platform/http/vertx/VertxPlatformHttpSupport.java b/components/camel-platform-http-vertx/src/main/java/org/apache/camel/component/platform/http/vertx/VertxPlatformHttpSupport.java
index ddf3760da7b39..61277a7853982 100644
--- a/components/camel-platform-http-vertx/src/main/java/org/apache/camel/component/platform/http/vertx/VertxPlatformHttpSupport.java
+++ b/components/camel-platform-http-vertx/src/main/java/org/apache/camel/component/platform/http/vertx/VertxPlatformHttpSupport.java
@@ -110,6 +110,14 @@ static Object toHttpResponse(HttpServerResponse response, Message message, Heade
             ExchangeHelper.setFailureHandled(exchange);
         }
 
+        // set the content-length if it can be determined, or chunked encoding
+        final Integer length = determineContentLength(exchange, body);
+        if (length != null) {
+            response.putHeader("Content-Length", String.valueOf(length));
+        } else {
+            response.setChunked(true);
+        }
+
         // set the content type in the response.
         final String contentType = MessageHelper.getContentType(message);
         if (contentType != null) {
@@ -119,6 +127,15 @@ static Object toHttpResponse(HttpServerResponse response, Message message, Heade
         return body;
     }
 
+    static Integer determineContentLength(Exchange camelExchange, Object body) {
+        if (body instanceof byte[]) {
+            return ((byte[]) body).length;
+        } else if (body instanceof ByteBuffer) {
+            return ((ByteBuffer) body).remaining();
+        }
+        return null;
+    }
+
     /*
      * Copied from org.apache.camel.http.common.DefaultHttpBinding.determineResponseCode(Exchange, Object)
      * If DefaultHttpBinding.determineResponseCode(Exchange, Object) is moved to a module without the servlet-api