Camel : Stream response using http component

[KARTHIK PRABHU N]

Hello Team,

I have created a below route – exposed as rest endpoint using servlet
component and calling GCP API to download object using http component. We
want response to be streamed as it is very large object.



The below logic downloads object as byte which will end up in max heap
consumption. Could you please assist what is wrong with the below route.

I am using camel core version 4.8.

.from("{{exposed as rest endpoint using servlet component}}")

            .setHeader(Exchange.DISABLE_HTTP_STREAM_CACHE, constant(true))

            // Set correct GCS object URL

            .setHeader(Exchange.HTTP_URI, simple(


https://storage.googleapis.com/{{bucketName}}/?responsePayloadStreamingThreshold=-1

            ))

           // Use http component for streaming

            .to(http://dummy)



           // Forward content type if available

            .process(exchange -> {

                        InputStream responseStream =
exchange.getMessage().getBody(InputStream.class);

                        exchange.getMessage().setBody(responseStream);

                        String contentType =
exchange.getMessage().getHeader("Content-Type", String.class);

                        exchange.getMessage().setHeader("Content-Type",
contentType != null ? contentType : "application/octet-stream");


exchange.getMessage().setHeader("Transfer-Encoding", "chunked");

            })





            .end(); // stream response to client





Thank you !

Karthik