org.springframework.web.client.DefaultResponseErrorHandler Maven / Gradle / Ivy
/*
* Copyright 2002-2018 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
*
* https://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.IOException;
import java.nio.charset.Charset;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.client.ClientHttpResponse;
import org.springframework.util.FileCopyUtils;
/**
* Spring's default implementation of the {@link ResponseErrorHandler} interface.
*
* This error handler checks for the status code on the {@link ClientHttpResponse}:
* Any code with series {@link org.springframework.http.HttpStatus.Series#CLIENT_ERROR}
* or {@link org.springframework.http.HttpStatus.Series#SERVER_ERROR} is considered to be
* an error; this behavior can be changed by overriding the {@link #hasError(HttpStatus)}
* method. Unknown status codes will be ignored by {@link #hasError(ClientHttpResponse)}.
*
* @author Arjen Poutsma
* @author Rossen Stoyanchev
* @author Juergen Hoeller
* @since 3.0
* @see RestTemplate#setErrorHandler
*/
public class DefaultResponseErrorHandler implements ResponseErrorHandler {
/**
* Delegates to {@link #hasError(HttpStatus)} (for a standard status enum value) or
* {@link #hasError(int)} (for an unknown status code) with the response status code.
* @see ClientHttpResponse#getRawStatusCode()
* @see #hasError(HttpStatus)
* @see #hasError(int)
*/
@Override
public boolean hasError(ClientHttpResponse response) throws IOException {
int rawStatusCode = response.getRawStatusCode();
for (HttpStatus statusCode : HttpStatus.values()) {
if (statusCode.value() == rawStatusCode) {
return hasError(statusCode);
}
}
return hasError(rawStatusCode);
}
/**
* Template method called from {@link #hasError(ClientHttpResponse)}.
*
The default implementation checks if the given status code is
* {@link HttpStatus.Series#CLIENT_ERROR CLIENT_ERROR} or
* {@link HttpStatus.Series#SERVER_ERROR SERVER_ERROR}.
* Can be overridden in subclasses.
* @param statusCode the HTTP status code as enum value
* @return {@code true} if the response indicates an error; {@code false} otherwise
* @see HttpStatus#is4xxClientError()
* @see HttpStatus#is5xxServerError()
*/
protected boolean hasError(HttpStatus statusCode) {
return (statusCode.is4xxClientError() || statusCode.is5xxServerError());
}
/**
* Template method called from {@link #hasError(ClientHttpResponse)}.
*
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 indicates an error; {@code false} otherwise
* @since 4.3.21
* @see HttpStatus.Series#CLIENT_ERROR
* @see HttpStatus.Series#SERVER_ERROR
*/
protected boolean hasError(int unknownStatusCode) {
int seriesCode = unknownStatusCode / 100;
return (seriesCode == HttpStatus.Series.CLIENT_ERROR.value() ||
seriesCode == HttpStatus.Series.SERVER_ERROR.value());
}
/**
* This default implementation throws a {@link HttpClientErrorException} if the response status code
* is {@link org.springframework.http.HttpStatus.Series#CLIENT_ERROR}, a {@link HttpServerErrorException}
* if it is {@link org.springframework.http.HttpStatus.Series#SERVER_ERROR},
* and a {@link RestClientException} in other cases.
*/
@Override
public void handleError(ClientHttpResponse response) throws IOException {
HttpStatus statusCode = getHttpStatusCode(response);
switch (statusCode.series()) {
case CLIENT_ERROR:
throw new HttpClientErrorException(statusCode, response.getStatusText(),
response.getHeaders(), getResponseBody(response), getCharset(response));
case SERVER_ERROR:
throw new HttpServerErrorException(statusCode, response.getStatusText(),
response.getHeaders(), getResponseBody(response), getCharset(response));
default:
throw new UnknownHttpStatusCodeException(statusCode.value(), response.getStatusText(),
response.getHeaders(), getResponseBody(response), getCharset(response));
}
}
/**
* Determine the HTTP status of the given response.
*
Note: Only called from {@link #handleError}, not from {@link #hasError}.
* @param response the response to inspect
* @return the associated HTTP status
* @throws IOException in case of I/O errors
* @throws UnknownHttpStatusCodeException in case of an unknown status code
* that cannot be represented with the {@link HttpStatus} enum
* @since 4.3.8
*/
protected HttpStatus getHttpStatusCode(ClientHttpResponse response) throws IOException {
try {
return response.getStatusCode();
}
catch (IllegalArgumentException ex) {
throw new UnknownHttpStatusCodeException(response.getRawStatusCode(), response.getStatusText(),
response.getHeaders(), getResponseBody(response), getCharset(response));
}
}
/**
* Read the body of the given response (for inclusion in a status exception).
* @param response the response to inspect
* @return the response body as a byte array,
* or an empty byte array if the body could not be read
* @since 4.3.8
*/
protected byte[] getResponseBody(ClientHttpResponse response) {
try {
return FileCopyUtils.copyToByteArray(response.getBody());
}
catch (IOException ex) {
// ignore
}
return new byte[0];
}
/**
* Determine the charset of the response (for inclusion in a status exception).
* @param response the response to inspect
* @return the associated charset, or {@code null} if none
* @since 4.3.8
*/
protected Charset getCharset(ClientHttpResponse response) {
HttpHeaders headers = response.getHeaders();
MediaType contentType = headers.getContentType();
return (contentType != null ? contentType.getCharset() : null);
}
}