org.springframework.web.client.RestTemplate 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.web.client;
import java.io.IOException;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.net.URI;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import org.springframework.core.ParameterizedTypeReference;
import org.springframework.core.SpringProperties;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.RequestEntity;
import org.springframework.http.ResponseEntity;
import org.springframework.http.client.ClientHttpRequest;
import org.springframework.http.client.ClientHttpRequestFactory;
import org.springframework.http.client.ClientHttpResponse;
import org.springframework.http.client.support.InterceptingHttpAccessor;
import org.springframework.http.converter.ByteArrayHttpMessageConverter;
import org.springframework.http.converter.GenericHttpMessageConverter;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.ResourceHttpMessageConverter;
import org.springframework.http.converter.StringHttpMessageConverter;
import org.springframework.http.converter.cbor.MappingJackson2CborHttpMessageConverter;
import org.springframework.http.converter.feed.AtomFeedHttpMessageConverter;
import org.springframework.http.converter.feed.RssChannelHttpMessageConverter;
import org.springframework.http.converter.json.GsonHttpMessageConverter;
import org.springframework.http.converter.json.JsonbHttpMessageConverter;
import org.springframework.http.converter.json.KotlinSerializationJsonHttpMessageConverter;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.http.converter.smile.MappingJackson2SmileHttpMessageConverter;
import org.springframework.http.converter.support.AllEncompassingFormHttpMessageConverter;
import org.springframework.http.converter.xml.Jaxb2RootElementHttpMessageConverter;
import org.springframework.http.converter.xml.MappingJackson2XmlHttpMessageConverter;
import org.springframework.http.converter.xml.SourceHttpMessageConverter;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
import org.springframework.util.ClassUtils;
import org.springframework.web.util.DefaultUriBuilderFactory;
import org.springframework.web.util.DefaultUriBuilderFactory.EncodingMode;
import org.springframework.web.util.UriTemplateHandler;
/**
* Synchronous client to perform HTTP requests, exposing a simple, template
* method API over underlying HTTP client libraries such as the JDK
* {@code HttpURLConnection}, Apache HttpComponents, and others. RestTemplate
* offers templates for common scenarios by HTTP method, in addition to the
* generalized {@code exchange} and {@code execute} methods that support of
* less frequent cases.
*
* RestTemplate is typically used as a shared component. However, its
* configuration does not support concurrent modification, and as such its
* configuration is typically prepared on startup. If necessary, you can create
* multiple, differently configured RestTemplate instances on startup. Such
* instances may use the same the underlying {@link ClientHttpRequestFactory}
* if they need to share HTTP client resources.
*
*
NOTE: As of 5.0 this class is in maintenance mode, with
* only minor requests for changes and bugs to be accepted going forward. Please,
* consider using the {@code org.springframework.web.reactive.client.WebClient}
* which has a more modern API and supports sync, async, and streaming scenarios.
*
* @author Arjen Poutsma
* @author Brian Clozel
* @author Roy Clarkson
* @author Juergen Hoeller
* @author Sam Brannen
* @author Sebastien Deleuze
* @since 3.0
* @see HttpMessageConverter
* @see RequestCallback
* @see ResponseExtractor
* @see ResponseErrorHandler
*/
public class RestTemplate extends InterceptingHttpAccessor implements RestOperations {
/**
* Boolean flag controlled by a {@code spring.xml.ignore} system property that instructs Spring to
* ignore XML, i.e. to not initialize the XML-related infrastructure.
*
The default is "false".
*/
private static final boolean shouldIgnoreXml = SpringProperties.getFlag("spring.xml.ignore");
private static final boolean romePresent;
private static final boolean jaxb2Present;
private static final boolean jackson2Present;
private static final boolean jackson2XmlPresent;
private static final boolean jackson2SmilePresent;
private static final boolean jackson2CborPresent;
private static final boolean gsonPresent;
private static final boolean jsonbPresent;
private static final boolean kotlinSerializationJsonPresent;
static {
ClassLoader classLoader = RestTemplate.class.getClassLoader();
romePresent = ClassUtils.isPresent("com.rometools.rome.feed.WireFeed", classLoader);
jaxb2Present = ClassUtils.isPresent("javax.xml.bind.Binder", classLoader);
jackson2Present = ClassUtils.isPresent("com.fasterxml.jackson.databind.ObjectMapper", classLoader) &&
ClassUtils.isPresent("com.fasterxml.jackson.core.JsonGenerator", classLoader);
jackson2XmlPresent = ClassUtils.isPresent("com.fasterxml.jackson.dataformat.xml.XmlMapper", classLoader);
jackson2SmilePresent = ClassUtils.isPresent("com.fasterxml.jackson.dataformat.smile.SmileFactory", classLoader);
jackson2CborPresent = ClassUtils.isPresent("com.fasterxml.jackson.dataformat.cbor.CBORFactory", classLoader);
gsonPresent = ClassUtils.isPresent("com.google.gson.Gson", classLoader);
jsonbPresent = ClassUtils.isPresent("javax.json.bind.Jsonb", classLoader);
kotlinSerializationJsonPresent = ClassUtils.isPresent("kotlinx.serialization.json.Json", classLoader);
}
private final List> messageConverters = new ArrayList<>();
private ResponseErrorHandler errorHandler = new DefaultResponseErrorHandler();
private UriTemplateHandler uriTemplateHandler;
private final ResponseExtractor headersExtractor = new HeadersExtractor();
/**
* Create a new instance of the {@link RestTemplate} using default settings.
* Default {@link HttpMessageConverter HttpMessageConverters} are initialized.
*/
public RestTemplate() {
this.messageConverters.add(new ByteArrayHttpMessageConverter());
this.messageConverters.add(new StringHttpMessageConverter());
this.messageConverters.add(new ResourceHttpMessageConverter(false));
if (!shouldIgnoreXml) {
try {
this.messageConverters.add(new SourceHttpMessageConverter<>());
}
catch (Error err) {
// Ignore when no TransformerFactory implementation is available
}
}
this.messageConverters.add(new AllEncompassingFormHttpMessageConverter());
if (romePresent) {
this.messageConverters.add(new AtomFeedHttpMessageConverter());
this.messageConverters.add(new RssChannelHttpMessageConverter());
}
if (!shouldIgnoreXml) {
if (jackson2XmlPresent) {
this.messageConverters.add(new MappingJackson2XmlHttpMessageConverter());
}
else if (jaxb2Present) {
this.messageConverters.add(new Jaxb2RootElementHttpMessageConverter());
}
}
if (kotlinSerializationJsonPresent) {
this.messageConverters.add(new KotlinSerializationJsonHttpMessageConverter());
}
if (jackson2Present) {
this.messageConverters.add(new MappingJackson2HttpMessageConverter());
}
else if (gsonPresent) {
this.messageConverters.add(new GsonHttpMessageConverter());
}
else if (jsonbPresent) {
this.messageConverters.add(new JsonbHttpMessageConverter());
}
if (jackson2SmilePresent) {
this.messageConverters.add(new MappingJackson2SmileHttpMessageConverter());
}
if (jackson2CborPresent) {
this.messageConverters.add(new MappingJackson2CborHttpMessageConverter());
}
this.uriTemplateHandler = initUriTemplateHandler();
}
/**
* Create a new instance of the {@link RestTemplate} based on the given {@link ClientHttpRequestFactory}.
* @param requestFactory the HTTP request factory to use
* @see org.springframework.http.client.SimpleClientHttpRequestFactory
* @see org.springframework.http.client.HttpComponentsClientHttpRequestFactory
*/
public RestTemplate(ClientHttpRequestFactory requestFactory) {
this();
setRequestFactory(requestFactory);
}
/**
* Create a new instance of the {@link RestTemplate} using the given list of
* {@link HttpMessageConverter} to use.
* @param messageConverters the list of {@link HttpMessageConverter} to use
* @since 3.2.7
*/
public RestTemplate(List> messageConverters) {
validateConverters(messageConverters);
this.messageConverters.addAll(messageConverters);
this.uriTemplateHandler = initUriTemplateHandler();
}
private static DefaultUriBuilderFactory initUriTemplateHandler() {
DefaultUriBuilderFactory uriFactory = new DefaultUriBuilderFactory();
uriFactory.setEncodingMode(EncodingMode.URI_COMPONENT); // for backwards compatibility..
return uriFactory;
}
/**
* Set the message body converters to use.
* These converters are used to convert from and to HTTP requests and responses.
*/
public void setMessageConverters(List> messageConverters) {
validateConverters(messageConverters);
// Take getMessageConverters() List as-is when passed in here
if (this.messageConverters != messageConverters) {
this.messageConverters.clear();
this.messageConverters.addAll(messageConverters);
}
}
private void validateConverters(List> messageConverters) {
Assert.notEmpty(messageConverters, "At least one HttpMessageConverter is required");
Assert.noNullElements(messageConverters, "The HttpMessageConverter list must not contain null elements");
}
/**
* Return the list of message body converters.
* The returned {@link List} is active and may get appended to.
*/
public List> getMessageConverters() {
return this.messageConverters;
}
/**
* Set the error handler.
* By default, RestTemplate uses a {@link DefaultResponseErrorHandler}.
*/
public void setErrorHandler(ResponseErrorHandler errorHandler) {
Assert.notNull(errorHandler, "ResponseErrorHandler must not be null");
this.errorHandler = errorHandler;
}
/**
* Return the error handler.
*/
public ResponseErrorHandler getErrorHandler() {
return this.errorHandler;
}
/**
* Configure default URI variable values. This is a shortcut for:
*
* DefaultUriBuilderFactory factory = new DefaultUriBuilderFactory();
* handler.setDefaultUriVariables(...);
*
* RestTemplate restTemplate = new RestTemplate();
* restTemplate.setUriTemplateHandler(handler);
*
* @param uriVars the default URI variable values
* @since 4.3
*/
@SuppressWarnings("deprecation")
public void setDefaultUriVariables(Map uriVars) {
if (this.uriTemplateHandler instanceof DefaultUriBuilderFactory) {
((DefaultUriBuilderFactory) this.uriTemplateHandler).setDefaultUriVariables(uriVars);
}
else if (this.uriTemplateHandler instanceof org.springframework.web.util.AbstractUriTemplateHandler) {
((org.springframework.web.util.AbstractUriTemplateHandler) this.uriTemplateHandler)
.setDefaultUriVariables(uriVars);
}
else {
throw new IllegalArgumentException(
"This property is not supported with the configured UriTemplateHandler.");
}
}
/**
* Configure a strategy for expanding URI templates.
* By default, {@link DefaultUriBuilderFactory} is used and for
* backwards compatibility, the encoding mode is set to
* {@link EncodingMode#URI_COMPONENT URI_COMPONENT}. As of 5.0.8, prefer
* using {@link EncodingMode#TEMPLATE_AND_VALUES TEMPLATE_AND_VALUES}.
*
Note: in 5.0 the switch from
* {@link org.springframework.web.util.DefaultUriTemplateHandler
* DefaultUriTemplateHandler} (deprecated in 4.3), as the default to use, to
* {@link DefaultUriBuilderFactory} brings in a different default for the
* {@code parsePath} property (switching from false to true).
* @param handler the URI template handler to use
*/
public void setUriTemplateHandler(UriTemplateHandler handler) {
Assert.notNull(handler, "UriTemplateHandler must not be null");
this.uriTemplateHandler = handler;
}
/**
* Return the configured URI template handler.
*/
public UriTemplateHandler getUriTemplateHandler() {
return this.uriTemplateHandler;
}
// GET
@Override
@Nullable
public T getForObject(String url, Class responseType, Object... uriVariables) throws RestClientException {
RequestCallback requestCallback = acceptHeaderRequestCallback(responseType);
HttpMessageConverterExtractor responseExtractor =
new HttpMessageConverterExtractor<>(responseType, getMessageConverters(), logger);
return execute(url, HttpMethod.GET, requestCallback, responseExtractor, uriVariables);
}
@Override
@Nullable
public T getForObject(String url, Class responseType, Map uriVariables) throws RestClientException {
RequestCallback requestCallback = acceptHeaderRequestCallback(responseType);
HttpMessageConverterExtractor responseExtractor =
new HttpMessageConverterExtractor<>(responseType, getMessageConverters(), logger);
return execute(url, HttpMethod.GET, requestCallback, responseExtractor, uriVariables);
}
@Override
@Nullable
public T getForObject(URI url, Class responseType) throws RestClientException {
RequestCallback requestCallback = acceptHeaderRequestCallback(responseType);
HttpMessageConverterExtractor responseExtractor =
new HttpMessageConverterExtractor<>(responseType, getMessageConverters(), logger);
return execute(url, HttpMethod.GET, requestCallback, responseExtractor);
}
@Override
public ResponseEntity getForEntity(String url, Class responseType, Object... uriVariables)
throws RestClientException {
RequestCallback requestCallback = acceptHeaderRequestCallback(responseType);
ResponseExtractor> responseExtractor = responseEntityExtractor(responseType);
return nonNull(execute(url, HttpMethod.GET, requestCallback, responseExtractor, uriVariables));
}
@Override
public ResponseEntity getForEntity(String url, Class responseType, Map uriVariables)
throws RestClientException {
RequestCallback requestCallback = acceptHeaderRequestCallback(responseType);
ResponseExtractor> responseExtractor = responseEntityExtractor(responseType);
return nonNull(execute(url, HttpMethod.GET, requestCallback, responseExtractor, uriVariables));
}
@Override
public ResponseEntity getForEntity(URI url, Class responseType) throws RestClientException {
RequestCallback requestCallback = acceptHeaderRequestCallback(responseType);
ResponseExtractor> responseExtractor = responseEntityExtractor(responseType);
return nonNull(execute(url, HttpMethod.GET, requestCallback, responseExtractor));
}
// HEAD
@Override
public HttpHeaders headForHeaders(String url, Object... uriVariables) throws RestClientException {
return nonNull(execute(url, HttpMethod.HEAD, null, headersExtractor(), uriVariables));
}
@Override
public HttpHeaders headForHeaders(String url, Map uriVariables) throws RestClientException {
return nonNull(execute(url, HttpMethod.HEAD, null, headersExtractor(), uriVariables));
}
@Override
public HttpHeaders headForHeaders(URI url) throws RestClientException {
return nonNull(execute(url, HttpMethod.HEAD, null, headersExtractor()));
}
// POST
@Override
@Nullable
public URI postForLocation(String url, @Nullable Object request, Object... uriVariables)
throws RestClientException {
RequestCallback requestCallback = httpEntityCallback(request);
HttpHeaders headers = execute(url, HttpMethod.POST, requestCallback, headersExtractor(), uriVariables);
return (headers != null ? headers.getLocation() : null);
}
@Override
@Nullable
public URI postForLocation(String url, @Nullable Object request, Map uriVariables)
throws RestClientException {
RequestCallback requestCallback = httpEntityCallback(request);
HttpHeaders headers = execute(url, HttpMethod.POST, requestCallback, headersExtractor(), uriVariables);
return (headers != null ? headers.getLocation() : null);
}
@Override
@Nullable
public URI postForLocation(URI url, @Nullable Object request) throws RestClientException {
RequestCallback requestCallback = httpEntityCallback(request);
HttpHeaders headers = execute(url, HttpMethod.POST, requestCallback, headersExtractor());
return (headers != null ? headers.getLocation() : null);
}
@Override
@Nullable
public T postForObject(String url, @Nullable Object request, Class responseType,
Object... uriVariables) throws RestClientException {
RequestCallback requestCallback = httpEntityCallback(request, responseType);
HttpMessageConverterExtractor responseExtractor =
new HttpMessageConverterExtractor<>(responseType, getMessageConverters(), logger);
return execute(url, HttpMethod.POST, requestCallback, responseExtractor, uriVariables);
}
@Override
@Nullable
public T postForObject(String url, @Nullable Object request, Class responseType,
Map uriVariables) throws RestClientException {
RequestCallback requestCallback = httpEntityCallback(request, responseType);
HttpMessageConverterExtractor responseExtractor =
new HttpMessageConverterExtractor<>(responseType, getMessageConverters(), logger);
return execute(url, HttpMethod.POST, requestCallback, responseExtractor, uriVariables);
}
@Override
@Nullable
public T postForObject(URI url, @Nullable Object request, Class responseType)
throws RestClientException {
RequestCallback requestCallback = httpEntityCallback(request, responseType);
HttpMessageConverterExtractor responseExtractor =
new HttpMessageConverterExtractor<>(responseType, getMessageConverters());
return execute(url, HttpMethod.POST, requestCallback, responseExtractor);
}
@Override
public ResponseEntity postForEntity(String url, @Nullable Object request,
Class responseType, Object... uriVariables) throws RestClientException {
RequestCallback requestCallback = httpEntityCallback(request, responseType);
ResponseExtractor> responseExtractor = responseEntityExtractor(responseType);
return nonNull(execute(url, HttpMethod.POST, requestCallback, responseExtractor, uriVariables));
}
@Override
public ResponseEntity postForEntity(String url, @Nullable Object request,
Class responseType, Map uriVariables) throws RestClientException {
RequestCallback requestCallback = httpEntityCallback(request, responseType);
ResponseExtractor> responseExtractor = responseEntityExtractor(responseType);
return nonNull(execute(url, HttpMethod.POST, requestCallback, responseExtractor, uriVariables));
}
@Override
public ResponseEntity postForEntity(URI url, @Nullable Object request, Class responseType)
throws RestClientException {
RequestCallback requestCallback = httpEntityCallback(request, responseType);
ResponseExtractor> responseExtractor = responseEntityExtractor(responseType);
return nonNull(execute(url, HttpMethod.POST, requestCallback, responseExtractor));
}
// PUT
@Override
public void put(String url, @Nullable Object request, Object... uriVariables)
throws RestClientException {
RequestCallback requestCallback = httpEntityCallback(request);
execute(url, HttpMethod.PUT, requestCallback, null, uriVariables);
}
@Override
public void put(String url, @Nullable Object request, Map uriVariables)
throws RestClientException {
RequestCallback requestCallback = httpEntityCallback(request);
execute(url, HttpMethod.PUT, requestCallback, null, uriVariables);
}
@Override
public void put(URI url, @Nullable Object request) throws RestClientException {
RequestCallback requestCallback = httpEntityCallback(request);
execute(url, HttpMethod.PUT, requestCallback, null);
}
// PATCH
@Override
@Nullable
public T patchForObject(String url, @Nullable Object request, Class responseType,
Object... uriVariables) throws RestClientException {
RequestCallback requestCallback = httpEntityCallback(request, responseType);
HttpMessageConverterExtractor responseExtractor =
new HttpMessageConverterExtractor<>(responseType, getMessageConverters(), logger);
return execute(url, HttpMethod.PATCH, requestCallback, responseExtractor, uriVariables);
}
@Override
@Nullable
public T patchForObject(String url, @Nullable Object request, Class responseType,
Map uriVariables) throws RestClientException {
RequestCallback requestCallback = httpEntityCallback(request, responseType);
HttpMessageConverterExtractor responseExtractor =
new HttpMessageConverterExtractor<>(responseType, getMessageConverters(), logger);
return execute(url, HttpMethod.PATCH, requestCallback, responseExtractor, uriVariables);
}
@Override
@Nullable
public T patchForObject(URI url, @Nullable Object request, Class responseType)
throws RestClientException {
RequestCallback requestCallback = httpEntityCallback(request, responseType);
HttpMessageConverterExtractor responseExtractor =
new HttpMessageConverterExtractor<>(responseType, getMessageConverters());
return execute(url, HttpMethod.PATCH, requestCallback, responseExtractor);
}
// DELETE
@Override
public void delete(String url, Object... uriVariables) throws RestClientException {
execute(url, HttpMethod.DELETE, null, null, uriVariables);
}
@Override
public void delete(String url, Map uriVariables) throws RestClientException {
execute(url, HttpMethod.DELETE, null, null, uriVariables);
}
@Override
public void delete(URI url) throws RestClientException {
execute(url, HttpMethod.DELETE, null, null);
}
// OPTIONS
@Override
public Set optionsForAllow(String url, Object... uriVariables) throws RestClientException {
ResponseExtractor headersExtractor = headersExtractor();
HttpHeaders headers = execute(url, HttpMethod.OPTIONS, null, headersExtractor, uriVariables);
return (headers != null ? headers.getAllow() : Collections.emptySet());
}
@Override
public Set optionsForAllow(String url, Map uriVariables) throws RestClientException {
ResponseExtractor headersExtractor = headersExtractor();
HttpHeaders headers = execute(url, HttpMethod.OPTIONS, null, headersExtractor, uriVariables);
return (headers != null ? headers.getAllow() : Collections.emptySet());
}
@Override
public Set optionsForAllow(URI url) throws RestClientException {
ResponseExtractor headersExtractor = headersExtractor();
HttpHeaders headers = execute(url, HttpMethod.OPTIONS, null, headersExtractor);
return (headers != null ? headers.getAllow() : Collections.emptySet());
}
// exchange
@Override
public ResponseEntity exchange(String url, HttpMethod method,
@Nullable HttpEntity requestEntity, Class responseType, Object... uriVariables)
throws RestClientException {
RequestCallback requestCallback = httpEntityCallback(requestEntity, responseType);
ResponseExtractor> responseExtractor = responseEntityExtractor(responseType);
return nonNull(execute(url, method, requestCallback, responseExtractor, uriVariables));
}
@Override
public ResponseEntity exchange(String url, HttpMethod method,
@Nullable HttpEntity requestEntity, Class responseType, Map uriVariables)
throws RestClientException {
RequestCallback requestCallback = httpEntityCallback(requestEntity, responseType);
ResponseExtractor> responseExtractor = responseEntityExtractor(responseType);
return nonNull(execute(url, method, requestCallback, responseExtractor, uriVariables));
}
@Override
public ResponseEntity exchange(URI url, HttpMethod method, @Nullable HttpEntity requestEntity,
Class responseType) throws RestClientException {
RequestCallback requestCallback = httpEntityCallback(requestEntity, responseType);
ResponseExtractor> responseExtractor = responseEntityExtractor(responseType);
return nonNull(execute(url, method, requestCallback, responseExtractor));
}
@Override
public ResponseEntity exchange(String url, HttpMethod method, @Nullable HttpEntity requestEntity,
ParameterizedTypeReference responseType, Object... uriVariables) throws RestClientException {
Type type = responseType.getType();
RequestCallback requestCallback = httpEntityCallback(requestEntity, type);
ResponseExtractor> responseExtractor = responseEntityExtractor(type);
return nonNull(execute(url, method, requestCallback, responseExtractor, uriVariables));
}
@Override
public ResponseEntity exchange(String url, HttpMethod method, @Nullable HttpEntity requestEntity,
ParameterizedTypeReference responseType, Map uriVariables) throws RestClientException {
Type type = responseType.getType();
RequestCallback requestCallback = httpEntityCallback(requestEntity, type);
ResponseExtractor> responseExtractor = responseEntityExtractor(type);
return nonNull(execute(url, method, requestCallback, responseExtractor, uriVariables));
}
@Override
public ResponseEntity exchange(URI url, HttpMethod method, @Nullable HttpEntity requestEntity,
ParameterizedTypeReference responseType) throws RestClientException {
Type type = responseType.getType();
RequestCallback requestCallback = httpEntityCallback(requestEntity, type);
ResponseExtractor> responseExtractor = responseEntityExtractor(type);
return nonNull(execute(url, method, requestCallback, responseExtractor));
}
@Override
public ResponseEntity exchange(RequestEntity entity, Class responseType)
throws RestClientException {
RequestCallback requestCallback = httpEntityCallback(entity, responseType);
ResponseExtractor> responseExtractor = responseEntityExtractor(responseType);
return nonNull(doExecute(resolveUrl(entity), entity.getMethod(), requestCallback, responseExtractor));
}
@Override
public ResponseEntity exchange(RequestEntity entity, ParameterizedTypeReference responseType)
throws RestClientException {
Type type = responseType.getType();
RequestCallback requestCallback = httpEntityCallback(entity, type);
ResponseExtractor> responseExtractor = responseEntityExtractor(type);
return nonNull(doExecute(resolveUrl(entity), entity.getMethod(), requestCallback, responseExtractor));
}
private URI resolveUrl(RequestEntity entity) {
if (entity instanceof RequestEntity.UriTemplateRequestEntity) {
RequestEntity.UriTemplateRequestEntity ext = (RequestEntity.UriTemplateRequestEntity) entity;
if (ext.getVars() != null) {
return this.uriTemplateHandler.expand(ext.getUriTemplate(), ext.getVars());
}
else if (ext.getVarsMap() != null) {
return this.uriTemplateHandler.expand(ext.getUriTemplate(), ext.getVarsMap());
}
else {
throw new IllegalStateException("No variables specified for URI template: " + ext.getUriTemplate());
}
}
else {
return entity.getUrl();
}
}
// General execution
/**
* {@inheritDoc}
* To provide a {@code RequestCallback} or {@code ResponseExtractor} only,
* but not both, consider using:
*
* - {@link #acceptHeaderRequestCallback(Class)}
*
- {@link #httpEntityCallback(Object)}
*
- {@link #httpEntityCallback(Object, Type)}
*
- {@link #responseEntityExtractor(Type)}
*
*/
@Override
@Nullable
public T execute(String url, HttpMethod method, @Nullable RequestCallback requestCallback,
@Nullable ResponseExtractor responseExtractor, Object... uriVariables) throws RestClientException {
URI expanded = getUriTemplateHandler().expand(url, uriVariables);
return doExecute(expanded, method, requestCallback, responseExtractor);
}
/**
* {@inheritDoc}
* To provide a {@code RequestCallback} or {@code ResponseExtractor} only,
* but not both, consider using:
*
* - {@link #acceptHeaderRequestCallback(Class)}
*
- {@link #httpEntityCallback(Object)}
*
- {@link #httpEntityCallback(Object, Type)}
*
- {@link #responseEntityExtractor(Type)}
*
*/
@Override
@Nullable
public T execute(String url, HttpMethod method, @Nullable RequestCallback requestCallback,
@Nullable ResponseExtractor responseExtractor, Map uriVariables)
throws RestClientException {
URI expanded = getUriTemplateHandler().expand(url, uriVariables);
return doExecute(expanded, method, requestCallback, responseExtractor);
}
/**
* {@inheritDoc}
* To provide a {@code RequestCallback} or {@code ResponseExtractor} only,
* but not both, consider using:
*
* - {@link #acceptHeaderRequestCallback(Class)}
*
- {@link #httpEntityCallback(Object)}
*
- {@link #httpEntityCallback(Object, Type)}
*
- {@link #responseEntityExtractor(Type)}
*
*/
@Override
@Nullable
public T execute(URI url, HttpMethod method, @Nullable RequestCallback requestCallback,
@Nullable ResponseExtractor responseExtractor) throws RestClientException {
return doExecute(url, method, requestCallback, responseExtractor);
}
/**
* Execute the given method on the provided URI.
* The {@link ClientHttpRequest} is processed using the {@link RequestCallback};
* the response with the {@link ResponseExtractor}.
* @param url the fully-expanded URL to connect to
* @param method the HTTP method to execute (GET, POST, etc.)
* @param requestCallback object that prepares the request (can be {@code null})
* @param responseExtractor object that extracts the return value from the response (can be {@code null})
* @return an arbitrary object, as returned by the {@link ResponseExtractor}
*/
@Nullable
protected T doExecute(URI url, @Nullable HttpMethod method, @Nullable RequestCallback requestCallback,
@Nullable ResponseExtractor responseExtractor) throws RestClientException {
Assert.notNull(url, "URI is required");
Assert.notNull(method, "HttpMethod is required");
ClientHttpResponse response = null;
try {
ClientHttpRequest request = createRequest(url, method);
if (requestCallback != null) {
requestCallback.doWithRequest(request);
}
response = request.execute();
handleResponse(url, method, response);
return (responseExtractor != null ? responseExtractor.extractData(response) : null);
}
catch (IOException ex) {
String resource = url.toString();
String query = url.getRawQuery();
resource = (query != null ? resource.substring(0, resource.indexOf('?')) : resource);
throw new ResourceAccessException("I/O error on " + method.name() +
" request for \"" + resource + "\": " + ex.getMessage(), ex);
}
finally {
if (response != null) {
response.close();
}
}
}
/**
* Handle the given response, performing appropriate logging and
* invoking the {@link ResponseErrorHandler} if necessary.
* Can be overridden in subclasses.
* @param url the fully-expanded URL to connect to
* @param method the HTTP method to execute (GET, POST, etc.)
* @param response the resulting {@link ClientHttpResponse}
* @throws IOException if propagated from {@link ResponseErrorHandler}
* @since 4.1.6
* @see #setErrorHandler
*/
protected void handleResponse(URI url, HttpMethod method, ClientHttpResponse response) throws IOException {
ResponseErrorHandler errorHandler = getErrorHandler();
boolean hasError = errorHandler.hasError(response);
if (logger.isDebugEnabled()) {
try {
int code = response.getRawStatusCode();
HttpStatus status = HttpStatus.resolve(code);
logger.debug("Response " + (status != null ? status : code));
}
catch (IOException ex) {
logger.debug("Failed to obtain response status code", ex);
}
}
if (hasError) {
errorHandler.handleError(url, method, response);
}
}
/**
* Return a {@code RequestCallback} that sets the request {@code Accept}
* header based on the given response type, cross-checked against the
* configured message converters.
*/
public RequestCallback acceptHeaderRequestCallback(Class responseType) {
return new AcceptHeaderRequestCallback(responseType);
}
/**
* Return a {@code RequestCallback} implementation that writes the given
* object to the request stream.
*/
public RequestCallback httpEntityCallback(@Nullable Object requestBody) {
return new HttpEntityRequestCallback(requestBody);
}
/**
* Return a {@code RequestCallback} implementation that:
*
* - Sets the request {@code Accept} header based on the given response
* type, cross-checked against the configured message converters.
*
- Writes the given object to the request stream.
*
*/
public RequestCallback httpEntityCallback(@Nullable Object requestBody, Type responseType) {
return new HttpEntityRequestCallback(requestBody, responseType);
}
/**
* Return a {@code ResponseExtractor} that prepares a {@link ResponseEntity}.
*/
public ResponseExtractor> responseEntityExtractor(Type responseType) {
return new ResponseEntityResponseExtractor<>(responseType);
}
/**
* Return a response extractor for {@link HttpHeaders}.
*/
protected ResponseExtractor headersExtractor() {
return this.headersExtractor;
}
private static T nonNull(@Nullable T result) {
Assert.state(result != null, "No result");
return result;
}
/**
* Request callback implementation that prepares the request's accept headers.
*/
private class AcceptHeaderRequestCallback implements RequestCallback {
@Nullable
private final Type responseType;
public AcceptHeaderRequestCallback(@Nullable Type responseType) {
this.responseType = responseType;
}
@Override
public void doWithRequest(ClientHttpRequest request) throws IOException {
if (this.responseType != null) {
List allSupportedMediaTypes = getMessageConverters().stream()
.filter(converter -> canReadResponse(this.responseType, converter))
.flatMap((HttpMessageConverter converter) -> getSupportedMediaTypes(this.responseType, converter))
.distinct()
.sorted(MediaType.SPECIFICITY_COMPARATOR)
.collect(Collectors.toList());
if (logger.isDebugEnabled()) {
logger.debug("Accept=" + allSupportedMediaTypes);
}
request.getHeaders().setAccept(allSupportedMediaTypes);
}
}
private boolean canReadResponse(Type responseType, HttpMessageConverter converter) {
Class responseClass = (responseType instanceof Class ? (Class) responseType : null);
if (responseClass != null) {
return converter.canRead(responseClass, null);
}
else if (converter instanceof GenericHttpMessageConverter) {
GenericHttpMessageConverter genericConverter = (GenericHttpMessageConverter) converter;
return genericConverter.canRead(responseType, null, null);
}
return false;
}
private Stream getSupportedMediaTypes(Type type, HttpMessageConverter converter) {
Type rawType = (type instanceof ParameterizedType ? ((ParameterizedType) type).getRawType() : type);
Class clazz = (rawType instanceof Class ? (Class) rawType : null);
return (clazz != null ? converter.getSupportedMediaTypes(clazz) : converter.getSupportedMediaTypes())
.stream()
.map(mediaType -> {
if (mediaType.getCharset() != null) {
return new MediaType(mediaType.getType(), mediaType.getSubtype());
}
return mediaType;
});
}
}
/**
* Request callback implementation that writes the given object to the request stream.
*/
private class HttpEntityRequestCallback extends AcceptHeaderRequestCallback {
private final HttpEntity requestEntity;
public HttpEntityRequestCallback(@Nullable Object requestBody) {
this(requestBody, null);
}
public HttpEntityRequestCallback(@Nullable Object requestBody, @Nullable Type responseType) {
super(responseType);
if (requestBody instanceof HttpEntity) {
this.requestEntity = (HttpEntity) requestBody;
}
else if (requestBody != null) {
this.requestEntity = new HttpEntity<>(requestBody);
}
else {
this.requestEntity = HttpEntity.EMPTY;
}
}
@Override
@SuppressWarnings("unchecked")
public void doWithRequest(ClientHttpRequest httpRequest) throws IOException {
super.doWithRequest(httpRequest);
Object requestBody = this.requestEntity.getBody();
if (requestBody == null) {
HttpHeaders httpHeaders = httpRequest.getHeaders();
HttpHeaders requestHeaders = this.requestEntity.getHeaders();
if (!requestHeaders.isEmpty()) {
requestHeaders.forEach((key, values) -> httpHeaders.put(key, new ArrayList<>(values)));
}
if (httpHeaders.getContentLength() < 0) {
httpHeaders.setContentLength(0L);
}
}
else {
Class requestBodyClass = requestBody.getClass();
Type requestBodyType = (this.requestEntity instanceof RequestEntity ?
((RequestEntity)this.requestEntity).getType() : requestBodyClass);
HttpHeaders httpHeaders = httpRequest.getHeaders();
HttpHeaders requestHeaders = this.requestEntity.getHeaders();
MediaType requestContentType = requestHeaders.getContentType();
for (HttpMessageConverter messageConverter : getMessageConverters()) {
if (messageConverter instanceof GenericHttpMessageConverter) {
GenericHttpMessageConverter