Introduce ServerRequest.methodName()

This commit introduces a methodName() method to the ServerRequest,
returning the String name of the method. This method is useful for
non-standard HTTP methods.

spring-test/src/main/java/org/springframework/mock/web/reactive/function/server/MockServerRequest.java

@@ -109,6 +109,11 @@ public class MockServerRequest implements ServerRequest {
 		return this.method;
 	}
 
+	@Override
+	public String methodName() {
+		return this.method.name();
+	}
+
 	@Override
 	public URI uri() {
 		return this.uri;

spring-webflux/src/main/java/org/springframework/web/reactive/function/server/DefaultServerRequest.java

@@ -35,7 +35,6 @@ import reactor.core.publisher.Mono;
 import org.springframework.core.ParameterizedTypeReference;
 import org.springframework.http.HttpCookie;
 import org.springframework.http.HttpHeaders;
-import org.springframework.http.HttpMethod;
 import org.springframework.http.HttpRange;
 import org.springframework.http.MediaType;
 import org.springframework.http.codec.HttpMessageReader;
@@ -83,10 +82,9 @@ class DefaultServerRequest implements ServerRequest {
 	}
 
 
-
 	@Override
-	public HttpMethod method() {
-		return request().getMethod();
+	public String methodName() {
+		return request().getMethodValue();
 	}
 
 	@Override

spring-webflux/src/main/java/org/springframework/web/reactive/function/server/RequestPredicates.java

@@ -476,6 +476,11 @@ public abstract class RequestPredicates {
 			return this.request.method();
 		}
 
+		@Override
+		public String methodName() {
+			return this.request.methodName();
+		}
+
 		@Override
 		public URI uri() {
 			return this.request.uri();

spring-webflux/src/main/java/org/springframework/web/reactive/function/server/ServerRequest.java

@@ -59,9 +59,19 @@ public interface ServerRequest {
 
 	/**
 	 * Return the HTTP method.
+	 * @return the HTTP method as an HttpMethod enum value, or {@code null}
+	 * if not resolvable (e.g. in case of a non-standard HTTP method)
 	 */
 	@Nullable
-	HttpMethod method();
+	default HttpMethod method() {
+		return HttpMethod.resolve(methodName());
+	}
+
+	/**
+	 * Return the name of the HTTP method.
+	 * @return the HTTP method as a String
+	 */
+	String methodName();
 
 	/**
 	 * Return the request URI.

spring-webflux/src/main/java/org/springframework/web/reactive/function/server/support/ServerRequestWrapper.java

@@ -79,6 +79,11 @@ public class ServerRequestWrapper implements ServerRequest {
 		return this.delegate.method();
 	}
 
+	@Override
+	public String methodName() {
+		return this.delegate.methodName();
+	}
+
 	@Override
 	public URI uri() {
 		return this.delegate.uri();

spring-webflux/src/test/java/org/springframework/web/reactive/function/server/MockServerRequest.java

@@ -108,6 +108,11 @@ public class MockServerRequest implements ServerRequest {
 		return this.method;
 	}
 
+	@Override
+	public String methodName() {
+		return this.method.name();
+	}
+
 	@Override
 	public URI uri() {
 		return this.uri;