DefaultResponseErrorHandler detects non-standard error code as well

Issue: SPR-17439

spring-web/src/main/java/org/springframework/http/HttpStatus.java

@@ -522,7 +522,6 @@ public enum HttpStatus {
 		return status;
 	}
 
-
 	/**
 	 * Resolve the given status code to an {@code HttpStatus}, if possible.
 	 * @param statusCode the HTTP status code (potentially non-standard)
@@ -565,18 +564,45 @@ public enum HttpStatus {
 			return this.value;
 		}
 
-		public static Series valueOf(int status) {
-			int seriesCode = status / 100;
+		/**
+		 * Return the enum constant of this type with the corresponding series.
+		 * @param status a standard HTTP status enum value
+		 * @return the enum constant of this type with the corresponding series
+		 * @throws IllegalArgumentException if this enum has no corresponding constant
+		 */
+		public static Series valueOf(HttpStatus status) {
+			return valueOf(status.value);
+		}
+
+		/**
+		 * Return the enum constant of this type with the corresponding series.
+		 * @param statusCode the HTTP status code (potentially non-standard)
+		 * @return the enum constant of this type with the corresponding series
+		 * @throws IllegalArgumentException if this enum has no corresponding constant
+		 */
+		public static Series valueOf(int statusCode) {
+			Series series = resolve(statusCode);
+			if (series == null) {
+				throw new IllegalArgumentException("No matching constant for [" + statusCode + "]");
+			}
+			return series;
+		}
+
+		/**
+		 * Resolve the given status code to an {@code HttpStatus.Series}, if possible.
+		 * @param statusCode the HTTP status code (potentially non-standard)
+		 * @return the corresponding {@code Series}, or {@code null} if not found
+		 * @since 5.1.3
+		 */
+		@Nullable
+		public static Series resolve(int statusCode) {
+			int seriesCode = statusCode / 100;
 			for (Series series : values()) {
 				if (series.value == seriesCode) {
 					return series;
 				}
 			}
-			throw new IllegalArgumentException("No matching constant for [" + status + "]");
-		}
-
-		public static Series valueOf(HttpStatus status) {
-			return valueOf(status.value);
+			return null;
 		}
 	}
 

spring-web/src/main/java/org/springframework/web/client/DefaultResponseErrorHandler.java

@@ -48,8 +48,9 @@ public class DefaultResponseErrorHandler implements ResponseErrorHandler {
 	 */
 	@Override
 	public boolean hasError(ClientHttpResponse response) throws IOException {
-		HttpStatus statusCode = HttpStatus.resolve(response.getRawStatusCode());
-		return (statusCode != null && hasError(statusCode));
+		int rawStatusCode = response.getRawStatusCode();
+		HttpStatus statusCode = HttpStatus.resolve(rawStatusCode);
+		return (statusCode != null ? hasError(statusCode) : hasError(rawStatusCode));
 	}
 
 	/**
@@ -58,7 +59,7 @@ public class DefaultResponseErrorHandler implements ResponseErrorHandler {
 	 * {@code HttpStatus.Series#CLIENT_ERROR CLIENT_ERROR} or
 	 * {@code HttpStatus.Series#SERVER_ERROR SERVER_ERROR}.
 	 * Can be overridden in subclasses.
-	 * @param statusCode the HTTP status code
+	 * @param statusCode the HTTP status code as enum value
 	 * @return {@code true} if the response has an error; {@code false} otherwise
 	 */
 	protected boolean hasError(HttpStatus statusCode) {
@@ -66,6 +67,21 @@ public class DefaultResponseErrorHandler implements ResponseErrorHandler {
 				statusCode.series() == HttpStatus.Series.SERVER_ERROR);
 	}
 
+	/**
+	 * Template method called from {@link #hasError(ClientHttpResponse)}.
+	 * <p>The default implementation checks if the given status code is
+	 * {@code HttpStatus.Series#CLIENT_ERROR CLIENT_ERROR} or
+	 * {@code HttpStatus.Series#SERVER_ERROR SERVER_ERROR}.
+	 * Can be overridden in subclasses.
+	 * @param unknownStatusCode the HTTP status code as raw value
+	 * @return {@code true} if the response has an error; {@code false} otherwise
+	 * @since 4.3.21
+	 */
+	protected boolean hasError(int unknownStatusCode) {
+		HttpStatus.Series series = HttpStatus.Series.resolve(unknownStatusCode);
+		return (series == HttpStatus.Series.CLIENT_ERROR || series == HttpStatus.Series.SERVER_ERROR);
+	}
+
 	/**
 	 * Delegates to {@link #handleError(ClientHttpResponse, HttpStatus)} with the response status code.
 	 */

spring-web/src/test/java/org/springframework/web/client/DefaultResponseErrorHandlerHttpStatusTests.java

@@ -28,7 +28,6 @@ import org.springframework.http.client.ClientHttpResponse;
 
 import static org.junit.Assert.*;
 import static org.mockito.BDDMockito.*;
-import static org.mockito.Mockito.mock;
 import static org.springframework.http.HttpStatus.*;
 
 /**
@@ -66,7 +65,7 @@ public class DefaultResponseErrorHandlerHttpStatusTests {
 	public HttpStatus httpStatus;
 
 	@Parameterized.Parameter(1)
-	public Class expectedExceptionClass;
+	public Class<? extends Throwable> expectedExceptionClass;
 
 	private final DefaultResponseErrorHandler handler = new DefaultResponseErrorHandler();
 
@@ -74,7 +73,13 @@ public class DefaultResponseErrorHandlerHttpStatusTests {
 
 
 	@Test
-	public void handleErrorIOException() throws Exception {
+	public void hasErrorTrue() throws Exception {
+		given(this.response.getRawStatusCode()).willReturn(this.httpStatus.value());
+		assertTrue(this.handler.hasError(this.response));
+	}
+
+	@Test
+	public void handleErrorException() throws Exception {
 		HttpHeaders headers = new HttpHeaders();
 		headers.setContentType(MediaType.TEXT_PLAIN);
 
@@ -91,10 +96,4 @@ public class DefaultResponseErrorHandlerHttpStatusTests {
 		}
 	}
 
-	@Test
-	public void hasErrorTrue() throws Exception {
-		given(this.response.getRawStatusCode()).willReturn(HttpStatus.NOT_FOUND.value());
-		assertTrue(handler.hasError(this.response));
-	}
-
 }

spring-web/src/test/java/org/springframework/web/client/DefaultResponseErrorHandlerTests.java

@@ -65,7 +65,7 @@ public class DefaultResponseErrorHandlerTests {
 		given(response.getRawStatusCode()).willReturn(HttpStatus.NOT_FOUND.value());
 		given(response.getStatusText()).willReturn("Not Found");
 		given(response.getHeaders()).willReturn(headers);
-		given(response.getBody()).willReturn(new ByteArrayInputStream("Hello World".getBytes("UTF-8")));
+		given(response.getBody()).willReturn(new ByteArrayInputStream("Hello World".getBytes(StandardCharsets.UTF_8)));
 
 		try {
 			handler.handleError(response);
@@ -101,8 +101,20 @@ public class DefaultResponseErrorHandlerTests {
 		handler.handleError(response);
 	}
 
+	@Test  // SPR-16108
+	public void hasErrorForUnknownStatusCode() throws Exception {
+		HttpHeaders headers = new HttpHeaders();
+		headers.setContentType(MediaType.TEXT_PLAIN);
+
+		given(response.getRawStatusCode()).willReturn(999);
+		given(response.getStatusText()).willReturn("Custom status code");
+		given(response.getHeaders()).willReturn(headers);
+
+		assertFalse(handler.hasError(response));
+	}
+
 	@Test(expected = UnknownHttpStatusCodeException.class)  // SPR-9406
-	public void unknownStatusCode() throws Exception {
+	public void handleErrorUnknownStatusCode() throws Exception {
 		HttpHeaders headers = new HttpHeaders();
 		headers.setContentType(MediaType.TEXT_PLAIN);
 
@@ -113,16 +125,52 @@ public class DefaultResponseErrorHandlerTests {
 		handler.handleError(response);
 	}
 
-	@Test  // SPR-16108
-	public void hasErrorForUnknownStatusCode() throws Exception {
+	@Test  // SPR-17461
+	public void hasErrorForCustomClientError() throws Exception {
 		HttpHeaders headers = new HttpHeaders();
 		headers.setContentType(MediaType.TEXT_PLAIN);
 
-		given(response.getRawStatusCode()).willReturn(999);
+		given(response.getRawStatusCode()).willReturn(499);
 		given(response.getStatusText()).willReturn("Custom status code");
 		given(response.getHeaders()).willReturn(headers);
 
-		assertFalse(handler.hasError(response));
+		assertTrue(handler.hasError(response));
+	}
+
+	@Test(expected = UnknownHttpStatusCodeException.class)
+	public void handleErrorForCustomClientError() throws Exception {
+		HttpHeaders headers = new HttpHeaders();
+		headers.setContentType(MediaType.TEXT_PLAIN);
+
+		given(response.getRawStatusCode()).willReturn(499);
+		given(response.getStatusText()).willReturn("Custom status code");
+		given(response.getHeaders()).willReturn(headers);
+
+		handler.handleError(response);
+	}
+
+	@Test  // SPR-17461
+	public void hasErrorForCustomServerError() throws Exception {
+		HttpHeaders headers = new HttpHeaders();
+		headers.setContentType(MediaType.TEXT_PLAIN);
+
+		given(response.getRawStatusCode()).willReturn(599);
+		given(response.getStatusText()).willReturn("Custom status code");
+		given(response.getHeaders()).willReturn(headers);
+
+		assertTrue(handler.hasError(response));
+	}
+
+	@Test(expected = UnknownHttpStatusCodeException.class)
+	public void handleErrorForCustomServerError() throws Exception {
+		HttpHeaders headers = new HttpHeaders();
+		headers.setContentType(MediaType.TEXT_PLAIN);
+
+		given(response.getRawStatusCode()).willReturn(599);
+		given(response.getStatusText()).willReturn("Custom status code");
+		given(response.getHeaders()).willReturn(headers);
+
+		handler.handleError(response);
 	}
 
 	@Test  // SPR-16604