Retain non-null HttpStatus return value in Client(Http)Response

See gh-23366

spring-test/src/main/java/org/springframework/mock/http/client/reactive/MockClientHttpResponse.java

@@ -71,7 +71,7 @@ public class MockClientHttpResponse implements ClientHttpResponse {
 
 	@Override
 	public HttpStatus getStatusCode() {
-		return HttpStatus.resolve(this.status);
+		return HttpStatus.valueOf(this.status);
 	}
 
 	@Override
@@ -81,10 +81,9 @@ public class MockClientHttpResponse implements ClientHttpResponse {
 
 	@Override
 	public HttpHeaders getHeaders() {
-		String headerName = HttpHeaders.SET_COOKIE;
-		if (!getCookies().isEmpty() && this.headers.get(headerName) == null) {
+		if (!getCookies().isEmpty() && this.headers.get(HttpHeaders.SET_COOKIE) == null) {
 			getCookies().values().stream().flatMap(Collection::stream)
-					.forEach(cookie -> getHeaders().add(headerName, cookie.toString()));
+					.forEach(cookie -> getHeaders().add(HttpHeaders.SET_COOKIE, cookie.toString()));
 		}
 		return this.headers;
 	}

spring-web/src/main/java/org/springframework/http/client/ClientHttpResponse.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2017 the original author or authors.
+ * Copyright 2002-2019 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -35,10 +35,11 @@ import org.springframework.http.HttpStatus;
 public interface ClientHttpResponse extends HttpInputMessage, Closeable {
 
 	/**
-	 * Return the HTTP status code of the response.
-	 * @return the HTTP status as an HttpStatus enum value
+	 * Return the HTTP status code as an {@link HttpStatus} enum value.
+	 * @return the HTTP status as an HttpStatus enum value (never {@code null})
 	 * @throws IOException in case of I/O errors
 	 * @throws IllegalArgumentException in case of an unknown HTTP status code
+	 * @since #getRawStatusCode()
 	 * @see HttpStatus#valueOf(int)
 	 */
 	HttpStatus getStatusCode() throws IOException;
@@ -46,7 +47,7 @@ public interface ClientHttpResponse extends HttpInputMessage, Closeable {
 	/**
 	 * Return the HTTP status code (potentially non-standard and not
 	 * resolvable through the {@link HttpStatus} enum) as an integer.
-	 * @return the HTTP status as an integer
+	 * @return the HTTP status as an integer value
 	 * @throws IOException in case of I/O errors
 	 * @since 3.1.1
 	 * @see #getStatusCode()

spring-web/src/main/java/org/springframework/http/client/reactive/ClientHttpResponse.java

@@ -19,7 +19,6 @@ package org.springframework.http.client.reactive;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ReactiveHttpInputMessage;
 import org.springframework.http.ResponseCookie;
-import org.springframework.lang.Nullable;
 import org.springframework.util.MultiValueMap;
 
 /**
@@ -32,18 +31,18 @@ import org.springframework.util.MultiValueMap;
 public interface ClientHttpResponse extends ReactiveHttpInputMessage {
 
 	/**
-	 * Return the HTTP status code of the response.
-	 * @return the HTTP status as an HttpStatus enum value
+	 * Return the HTTP status code as an {@link HttpStatus} enum value.
+	 * @return the HTTP status as an HttpStatus enum value (never {@code null})
 	 * @throws IllegalArgumentException in case of an unknown HTTP status code
-	 * @see HttpStatus#resolve(int)
+	 * @since #getRawStatusCode()
+	 * @see HttpStatus#valueOf(int)
 	 */
-	@Nullable
 	HttpStatus getStatusCode();
 
 	/**
 	 * Return the HTTP status code (potentially non-standard and not
 	 * resolvable through the {@link HttpStatus} enum) as an integer.
-	 * @return the HTTP status as an integer
+	 * @return the HTTP status as an integer value
 	 * @since 5.0.6
 	 * @see #getStatusCode()
 	 * @see HttpStatus#resolve(int)

spring-web/src/main/java/org/springframework/http/client/reactive/ClientHttpResponseDecorator.java

@@ -48,7 +48,7 @@ public class ClientHttpResponseDecorator implements ClientHttpResponse {
 	}
 
 
-	// ServerHttpResponse delegation methods...
+	// ClientHttpResponse delegation methods...
 
 	@Override
 	public HttpStatus getStatusCode() {

spring-web/src/main/java/org/springframework/http/client/reactive/JettyClientHttpResponse.java

@@ -53,7 +53,7 @@ class JettyClientHttpResponse implements ClientHttpResponse {
 
 	@Override
 	public HttpStatus getStatusCode() {
-		return HttpStatus.resolve(getRawStatusCode());
+		return HttpStatus.valueOf(getRawStatusCode());
 	}
 
 	@Override

spring-web/src/main/java/org/springframework/http/client/reactive/ReactorClientHttpResponse.java

@@ -87,7 +87,7 @@ class ReactorClientHttpResponse implements ClientHttpResponse {
 
 	@Override
 	public HttpStatus getStatusCode() {
-		return HttpStatus.resolve(getRawStatusCode());
+		return HttpStatus.valueOf(getRawStatusCode());
 	}
 
 	@Override

spring-web/src/test/java/org/springframework/mock/http/client/reactive/test/MockClientHttpResponse.java

@@ -71,7 +71,7 @@ public class MockClientHttpResponse implements ClientHttpResponse {
 
 	@Override
 	public HttpStatus getStatusCode() {
-		return HttpStatus.resolve(this.status);
+		return HttpStatus.valueOf(this.status);
 	}
 
 	@Override
@@ -81,10 +81,9 @@ public class MockClientHttpResponse implements ClientHttpResponse {
 
 	@Override
 	public HttpHeaders getHeaders() {
-		String headerName = HttpHeaders.SET_COOKIE;
-		if (!getCookies().isEmpty() && this.headers.get(headerName) == null) {
+		if (!getCookies().isEmpty() && this.headers.get(HttpHeaders.SET_COOKIE) == null) {
 			getCookies().values().stream().flatMap(Collection::stream)
-					.forEach(cookie -> getHeaders().add(headerName, cookie.toString()));
+					.forEach(cookie -> getHeaders().add(HttpHeaders.SET_COOKIE, cookie.toString()));
 		}
 		return this.headers;
 	}

spring-webflux/src/main/java/org/springframework/web/reactive/function/client/ClientResponse.java

@@ -35,7 +35,6 @@ import org.springframework.http.ResponseEntity;
 import org.springframework.http.client.reactive.ClientHttpResponse;
 import org.springframework.http.codec.HttpMessageReader;
 import org.springframework.http.codec.HttpMessageWriter;
-import org.springframework.lang.Nullable;
 import org.springframework.util.MultiValueMap;
 import org.springframework.web.reactive.function.BodyExtractor;
 
@@ -60,17 +59,17 @@ import org.springframework.web.reactive.function.BodyExtractor;
 public interface ClientResponse {
 
 	/**
-	 * Return the status code of this response.
-	 * @return the status as an HttpStatus enum value
+	 * Return the HTTP status code as an {@link HttpStatus} enum value.
+	 * @return the HTTP status as an HttpStatus enum value (never {@code null})
 	 * @throws IllegalArgumentException in case of an unknown HTTP status code
-	 * @see HttpStatus#resolve(int)
+	 * @since #getRawStatusCode()
+	 * @see HttpStatus#valueOf(int)
 	 */
-	@Nullable
 	HttpStatus statusCode();
 
 	/**
 	 * Return the (potentially non-standard) status code of this response.
-	 * @return the status as an integer
+	 * @return the HTTP status as an integer value
 	 * @since 5.1
 	 * @see #statusCode()
 	 * @see HttpStatus#resolve(int)

spring-webflux/src/main/java/org/springframework/web/reactive/function/client/DefaultClientResponseBuilder.java

@@ -164,7 +164,7 @@ final class DefaultClientResponseBuilder implements ClientResponse.Builder {
 
 		@Override
 		public HttpStatus getStatusCode() {
-			return HttpStatus.resolve(this.statusCode);
+			return HttpStatus.valueOf(this.statusCode);
 		}
 
 		@Override

spring-webflux/src/test/java/org/springframework/web/reactive/function/client/DefaultClientResponseBuilderTests.java

@@ -18,7 +18,6 @@ package org.springframework.web.reactive.function.client;
 
 import java.nio.charset.StandardCharsets;
 
-import org.junit.Before;
 import org.junit.Test;
 import reactor.core.publisher.Flux;
 import reactor.test.StepVerifier;
@@ -32,19 +31,15 @@ import org.springframework.http.ResponseCookie;
 
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotNull;
-import static org.junit.Assert.assertNull;
+import static org.junit.Assert.fail;
 
 /**
  * @author Arjen Poutsma
  */
 public class DefaultClientResponseBuilderTests {
 
-	private DataBufferFactory dataBufferFactory;
+	private final DataBufferFactory dataBufferFactory = new DefaultDataBufferFactory();
 
-	@Before
-	public void createBufferFactory() {
-		this.dataBufferFactory = new DefaultDataBufferFactory();
-	}
 
 	@Test
 	public void normal() {
@@ -104,17 +99,17 @@ public class DefaultClientResponseBuilderTests {
 
 	@Test
 	public void fromCustomStatus() {
-
-		ClientResponse other = ClientResponse.create(499, ExchangeStrategies.withDefaults())
-				.build();
-
-		ClientResponse result = ClientResponse.from(other)
-				.build();
-
+		ClientResponse other = ClientResponse.create(499, ExchangeStrategies.withDefaults()).build();
+		ClientResponse result = ClientResponse.from(other).build();
 		assertEquals(499, result.rawStatusCode());
-		assertNull(result.statusCode());
 
+		try {
+			result.statusCode();
+			fail("Expected IllegalArgumentException");
+		}
+		catch (IllegalArgumentException ex) {
+			// expected
+		}
 	}
 
-
 }