I use:  

* Spring Boot
* Kotlin
* Spring MVC

One micro-service sends a ***multipart/form-data*** using REST to another micro-service (A -> C). I need to implement a security-gateway between those two micro-services (A -> B -> C)  

Can I just forward a request to another micro-service? (B -> C)  

All I need is to read just one param ***tenant-id*** from those params:   

A multipart form submit with the following parts:

```
deployment-name ----- text/plain 
enable-duplicate-filtering ----- text/plain 
deploy-changed-only ----- text/plain 
deployment-source ----- text/plain 
tenant-id ----- text/plain 
* ----- application/octet-stream 

```

That's simple with the following Controller: 

```
@PostMapping("/data/deployment/create")
    fun uploadDmn(
            @RequestParam("tenant-id")
            tenantId: String
    ) {
        println(tenantId)
    }

```

But how can I forward that request without reading it? Because I have no idea how I can read the last one param (`* ----- application/octet-stream`)