Add UnknownHttpStatusCodeException

This is more specific exception raised instead of RestClientException
when the raw HTTP status code received from the server is not one of
the HttpStatus enum values.

Issue: SPR-9406

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

@@ -445,8 +445,8 @@ public enum HttpStatus {
 			return this.value;
 		}
 
-		private static Series valueOf(HttpStatus status) {
-			int seriesCode = status.value() / 100;
+		public static Series valueOf(int status) {
+			int seriesCode = status / 100;
 			for (Series series : values()) {
 				if (series.value == seriesCode) {
 					return series;
@@ -455,6 +455,10 @@ public enum HttpStatus {
 			throw new IllegalArgumentException("No matching constant for [" + status + "]");
 		}
 
+		public static Series valueOf(HttpStatus status) {
+			return valueOf(status.value);
+		}
+
 	}
 
 }

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

@@ -36,6 +36,7 @@ import org.springframework.util.FileCopyUtils;
  * method.
  *
  * @author Arjen Poutsma
+ * @author Rossen Stoyanchev
  * @since 3.0
  * @see RestTemplate#setErrorHandler
  */
@@ -45,16 +46,17 @@ public class DefaultResponseErrorHandler implements ResponseErrorHandler {
 	 * Delegates to {@link #hasError(HttpStatus)} with the response status code.
 	 */
 	public boolean hasError(ClientHttpResponse response) throws IOException {
-		return hasError(getStatusCode(response));
+		return hasError(getHttpStatusCode(response));
 	}
 
-	private HttpStatus getStatusCode(ClientHttpResponse response) throws IOException {
+	private HttpStatus getHttpStatusCode(ClientHttpResponse response) throws IOException {
 		HttpStatus statusCode;
 		try {
 			statusCode = response.getStatusCode();
 		}
 		catch (IllegalArgumentException ex) {
-			throw new RestClientException("Unknown status code [" + response.getRawStatusCode() + "]");
+			throw new UnknownHttpStatusCodeException(response.getRawStatusCode(),
+					response.getStatusText(), response.getHeaders(), getResponseBody(response), getCharset(response));
 		}
 		return statusCode;
 	}
@@ -80,16 +82,14 @@ public class DefaultResponseErrorHandler implements ResponseErrorHandler {
 	 * and a {@link RestClientException} in other cases.
 	 */
 	public void handleError(ClientHttpResponse response) throws IOException {
-		HttpStatus statusCode = getStatusCode(response);
-		HttpHeaders headers = response.getHeaders();
-		MediaType contentType = headers.getContentType();
-		Charset charset = contentType != null ? contentType.getCharSet() : null;
-		byte[] body = getResponseBody(response);
+		HttpStatus statusCode = getHttpStatusCode(response);
 		switch (statusCode.series()) {
 			case CLIENT_ERROR:
-				throw new HttpClientErrorException(statusCode, response.getStatusText(), headers, body, charset);
+				throw new HttpClientErrorException(statusCode, response.getStatusText(),
+						response.getHeaders(), getResponseBody(response), getCharset(response));
 			case SERVER_ERROR:
-				throw new HttpServerErrorException(statusCode, response.getStatusText(), headers, body, charset);
+				throw new HttpServerErrorException(statusCode, response.getStatusText(),
+						response.getHeaders(), getResponseBody(response), getCharset(response));
 			default:
 				throw new RestClientException("Unknown status code [" + statusCode + "]");
 		}
@@ -108,4 +108,10 @@ public class DefaultResponseErrorHandler implements ResponseErrorHandler {
 		return new byte[0];
 	}
 
+	private Charset getCharset(ClientHttpResponse response) {
+		HttpHeaders headers = response.getHeaders();
+		MediaType contentType = headers.getContentType();
+		return contentType != null ? contentType.getCharSet() : null;
+	}
+
 }

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

@@ -0,0 +1,108 @@
+/*
+ * Copyright 2002-2012 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.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.web.client;
+
+import java.io.UnsupportedEncodingException;
+import java.nio.charset.Charset;
+
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.HttpStatus;
+
+/**
+ * Exception thrown when an unknown (or custom) HTTP status code is received.
+ *
+ * @author Rossen Stoyanchev
+ * @since 3.2
+ */
+public class UnknownHttpStatusCodeException extends RestClientException {
+
+	private static final long serialVersionUID = 4702443689088991600L;
+
+	private static final String DEFAULT_CHARSET = "ISO-8859-1";
+
+	private final int rawStatusCode;
+
+	private final String statusText;
+
+	private final byte[] responseBody;
+
+	private final HttpHeaders responseHeaders;
+
+	private final String responseCharset;
+
+
+	/**
+	 * Construct a new instance of {@code HttpStatusCodeException} based on an
+	 * {@link HttpStatus}, status text, and response body content.
+	 * @param rawStatusCode the raw status code value
+	 * @param statusText the status text
+	 * @param responseHeaders the response headers, may be {@code null}
+	 * @param responseBody the response body content, may be {@code null}
+	 * @param responseCharset the response body charset, may be {@code null}
+	 */
+	public UnknownHttpStatusCodeException(int rawStatusCode, String statusText,
+			HttpHeaders responseHeaders, byte[] responseBody, Charset responseCharset) {
+
+		super("Unknown status code [" + String.valueOf(rawStatusCode) + "]" + " " + statusText);
+		this.rawStatusCode = rawStatusCode;
+		this.statusText = statusText;
+		this.responseHeaders = responseHeaders;
+		this.responseBody = responseBody != null ? responseBody : new byte[0];
+		this.responseCharset = responseCharset != null ? responseCharset.name() : DEFAULT_CHARSET;
+	}
+
+	/**
+	 * Return the raw HTTP status code value.
+	 */
+	public int getRawStatusCode() {
+		return this.rawStatusCode;
+	}
+
+	/**
+	 * Return the HTTP status text.
+	 */
+	public String getStatusText() {
+		return this.statusText;
+	}
+
+	/**
+	 * Return the HTTP response headers.
+	 */
+	public HttpHeaders getResponseHeaders() {
+		return this.responseHeaders;
+	}
+
+	/**
+	 * Return the response body as a byte array.
+	 */
+	public byte[] getResponseBodyAsByteArray() {
+		return responseBody;
+	}
+
+	/**
+	 * Return the response body as a string.
+	 */
+	public String getResponseBodyAsString() {
+		try {
+			return new String(responseBody, responseCharset);
+		}
+		catch (UnsupportedEncodingException ex) {
+			// should not occur
+			throw new InternalError(ex.getMessage());
+		}
+	}
+
+}