Spring Redirect Attributes being lost when redirecting to absolute url via a gateway such as Zuul

README.md

Spring Redirect Attributes and redirect to absolute url via Zuul

When using the Spring RedirectAttributes, it uses a FlashMap with a targetRequestPath This targetRequestPath is checked against each incoming request and if they match the it is added to the Model

However I found when using RedirectAttributes and then redirecting to an absoluteUrl to integrate with zuul, the request being checked against the FlashMap targetRequestUrl included the zuul route and so failed to match.

This gist shows my fix by stripping the zuul route from the targetRequest being matched against

Config.java

@Configuration
public class Config extends WebMvcConfigurerAdapter {
	
    @Bean
    public FlashMessageHandler flashMapManager(){
	    return new FlashMessageHandler();
    }
}

FlashMessageHandler.java

@Component
public class FlashMessageHandler extends SessionFlashMapManager {

    @Value("#{'${spring.application.name}'.toUpperCase()}")
    private String applicationName;

    @Override
    protected boolean isFlashMapForRequest(FlashMap flashMap, HttpServletRequest request) {
        String expectedPath = flashMap.getTargetRequestPath();
        flashMap.setTargetRequestPath(expectedPath.replace("/"+applicationName, ""));
        return super.isFlashMapForRequest(flashMap, request);
    }
}