How to get full list of request headers in Micronaut

Question

I am trying to get a list of all headers sent in a http request in a Micronaut @Controller.

Answer 1

You need to add a variable of type io.micronaut.http.HttpHeaders to your API endpoint parameters. Give this a shot:

import io.micronaut.http.annotation.Controller;
import io.micronaut.http.annotation.Get;
import io.micronaut.http.HttpResponse;

@Controller
public class TestController {
    @Get("/test/http-headers") 
    public HttpResponse<String> getHttpHeaders(HttpHeaders headers) {
        for (val header : headers.entrySet()) {
            // Do stuff with header.getKey() and header.getValue()
        }

        return HttpResponse.ok("Testing");
    }
}

Latest docs on HttpHeaders: https://docs.micronaut.io/latest/api/io/micronaut/http/HttpHeaders.html#method.summary

Answer 2

https://docs.micronaut.io/latest/guide/index.html#requestResponse

import io.micronaut.http.HttpRequest;
import io.micronaut.http.HttpResponse;
import io.micronaut.http.annotation.Controller;
import io.micronaut.http.annotation.Get;

@Controller("/request")
public class MessageController {

    @Get("/hello") 
    public HttpResponse<String> hello(HttpHeaders headers) {
        // deal with the headers
        return HttpResponse.ok("Hello world!!")
                 .header("X-My-Header", "Foo"); 
    }
}

https://docs.micronaut.io/latest/api/io/micronaut/http/HttpHeaders.html