org.springframework.http.client.SimpleClientHttpResponse Maven / Gradle / Ivy
/*
* Copyright 2002-2023 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.http.client;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatusCode;
import org.springframework.lang.Nullable;
import org.springframework.util.StreamUtils;
import org.springframework.util.StringUtils;
/**
* {@link ClientHttpResponse} implementation that uses standard JDK facilities.
* Obtained via {@link SimpleClientHttpRequest#execute()}.
*
* @author Arjen Poutsma
* @author Brian Clozel
* @since 3.0
*/
final class SimpleClientHttpResponse implements ClientHttpResponse {
private final HttpURLConnection connection;
@Nullable
private HttpHeaders headers;
@Nullable
private InputStream responseStream;
SimpleClientHttpResponse(HttpURLConnection connection) {
this.connection = connection;
}
@Override
public HttpStatusCode getStatusCode() throws IOException {
return HttpStatusCode.valueOf(this.connection.getResponseCode());
}
@Override
public String getStatusText() throws IOException {
String result = this.connection.getResponseMessage();
return (result != null) ? result : "";
}
@Override
public HttpHeaders getHeaders() {
if (this.headers == null) {
this.headers = new HttpHeaders();
// Header field 0 is the status line for most HttpURLConnections, but not on GAE
String name = this.connection.getHeaderFieldKey(0);
if (StringUtils.hasLength(name)) {
this.headers.add(name, this.connection.getHeaderField(0));
}
int i = 1;
while (true) {
name = this.connection.getHeaderFieldKey(i);
if (!StringUtils.hasLength(name)) {
break;
}
this.headers.add(name, this.connection.getHeaderField(i));
i++;
}
}
return this.headers;
}
@Override
public InputStream getBody() throws IOException {
InputStream errorStream = this.connection.getErrorStream();
this.responseStream = (errorStream != null ? errorStream : this.connection.getInputStream());
return this.responseStream;
}
@Override
public void close() {
try {
if (this.responseStream == null) {
getBody();
}
StreamUtils.drain(this.responseStream);
this.responseStream.close();
}
catch (Exception ex) {
// ignore
}
}
}