Hello and welcome to another Camel development series. From now on I will paste less code to the blog and instead refer to the github repo where the code is stored. It makes writing the blog easier and that helps to motivate me to write more often.
In this serie I will touch upon a frequent scenario. Our problem is that we want to expose a HTTP endpoint in order to allow the client to perform a HTTP GET operation. We then want to call the backend HTTP(s) and retrieve say a picture and allow this to be displayed via the browser. How can we accomplish this?
Well if you want to jump straight to the code go here:
As you can see we accomplish this in four lines of code. We first expose our undertow endpoint and ensure only HTTP GET operations can be performed. Then we set the Exchange.HTTP_QUERY header to our query parameter. Finally we call the backend https service using the http4 component. The key here is to enable the parameter bridgeEndpoint=true so that Camel understands it is acting as a proxy and doesn’t mix up the endpoints. Finally we convert the payload to byte and return it to the original client. That’s all!