Spring Cloud Gateway Headers Example

An example project that illustrates how to configure Spring Cloud Gateway app to add Connection header to all requests to downstream backend service.

Use-Case

The requirement of Spring Cloud Gateway app is to add a Connection: Keep-Alive header to all downstream requests, regardless of the upstream client request.

                                                                          
+--------+              +---------+                         +------------+
|        +------------->| Spring  | Connection: keep-alive  | Downstream |
| Client |              | Cloud   +------------------------>| Backend    |
|        |              | Gateway |<------------------------+ Service    |
|        |<-------------+ App     |                         |            |
+--------+              +---------+                         +------------+
                                                                          

Getting Started

In case you wish to run the app yourself, feel free to clone the git repo and play around with it.

Prerequisites

The project uses:

• Java 12
• Maven

Installing

Since this is a Maven project, you can install it with:

$ mvn clean install

Testing

In the test I use WireMock to simulate the downstream backend service and WebTestClient to simulate the client. Test client makes HTTP requests to our app, which proxies them to WireMock server. At the end I assert that request made to WireMock server had Connection: keep-alive header.

You can run tests with maven:

$ mvn test

Author

• Josip Antoliš