Revisit empty body response support in HTTP client
Prior to this commit, HTTP responses without body (response status 204 or 304, Content-Length: 0) were handled properly by RestTemplates. But some other cases were not properly managed, throwing exceptions for valid HTTP responses. This commit better handles HTTP responses, using a response wrapper that can tell if a response: * has no message body (HTTP status 1XX, 204, 304 or Content-Length:0) * has an empty message body This covers rfc7230 Section 3.3.3. Issue: SPR-8016
This commit is contained in:
Brian Clozel
parent
d57f7f8783
commit
0225a7776c
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@ -25,7 +25,7 @@ import org.springframework.http.HttpStatus;
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import org.springframework.util.StreamUtils;
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/**
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* Simple implementation of {@link ClientHttpResponse} that reads the request's body into memory,
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* Simple implementation of {@link ClientHttpResponse} that reads the response's body into memory,
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* thus allowing for multiple invocations of {@link #getBody()}.
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*
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* @author Arjen Poutsma
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@ -23,7 +23,6 @@ import java.util.List;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import org.springframework.http.HttpHeaders;
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import org.springframework.http.HttpStatus;
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import org.springframework.http.MediaType;
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import org.springframework.http.client.ClientHttpResponse;
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@ -80,10 +79,12 @@ public class HttpMessageConverterExtractor<T> implements ResponseExtractor<T> {
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@Override
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@SuppressWarnings({ "unchecked", "rawtypes" })
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public T extractData(ClientHttpResponse response) throws IOException {
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if (!hasMessageBody(response)) {
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MessageBodyClientHttpResponseWrapper responseWrapper = new MessageBodyClientHttpResponseWrapper(response);
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if(!responseWrapper.hasMessageBody() || responseWrapper.hasEmptyMessageBody()) {
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return null;
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}
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MediaType contentType = getContentType(response);
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MediaType contentType = getContentType(responseWrapper);
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for (HttpMessageConverter<?> messageConverter : this.messageConverters) {
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if (messageConverter instanceof GenericHttpMessageConverter) {
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@ -93,7 +94,7 @@ public class HttpMessageConverterExtractor<T> implements ResponseExtractor<T> {
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logger.debug("Reading [" + this.responseType + "] as \"" +
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contentType + "\" using [" + messageConverter + "]");
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}
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return (T) genericMessageConverter.read(this.responseType, null, response);
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return (T) genericMessageConverter.read(this.responseType, null, responseWrapper);
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}
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}
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if (this.responseClass != null) {
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@ -102,7 +103,7 @@ public class HttpMessageConverterExtractor<T> implements ResponseExtractor<T> {
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logger.debug("Reading [" + this.responseClass.getName() + "] as \"" +
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contentType + "\" using [" + messageConverter + "]");
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}
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return (T) messageConverter.read((Class) this.responseClass, response);
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return (T) messageConverter.read((Class) this.responseClass, responseWrapper);
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}
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}
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}
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@ -122,39 +123,4 @@ public class HttpMessageConverterExtractor<T> implements ResponseExtractor<T> {
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return contentType;
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}
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/**
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* Indicates whether the given response has a message body.
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* <p>Default implementation returns {@code false} for:
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* <ul>
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* <li>a response status of {@code 204} or {@code 304}</li>
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* <li>a {@code Content-Length} of {@code 0}</li>
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* <li>no indication of content (no {@code Content-Length} nor {@code Transfer-encoding: chunked}) and
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* a ({@code Connection: closed}) header. See rfc7230 section 3.4</li>
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* </ul>
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*
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* @param response the response to check for a message body
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* @return {@code true} if the response has a body, {@code false} otherwise
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* @throws IOException in case of I/O errors
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*/
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protected boolean hasMessageBody(ClientHttpResponse response) throws IOException {
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HttpStatus responseStatus = response.getStatusCode();
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if (responseStatus == HttpStatus.NO_CONTENT ||
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responseStatus == HttpStatus.NOT_MODIFIED) {
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return false;
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}
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HttpHeaders headers = response.getHeaders();
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long contentLength = headers.getContentLength();
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if(contentLength == 0) {
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return false;
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}
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boolean chunked = headers.containsKey(HttpHeaders.TRANSFER_ENCODING)
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&& headers.get(HttpHeaders.TRANSFER_ENCODING).contains("chunked");
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boolean closed = headers.containsKey(HttpHeaders.CONNECTION)
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&& headers.getConnection().contains("close");
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if(!chunked && contentLength == -1 && closed) {
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return false;
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}
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return true;
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}
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}
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@ -0,0 +1,122 @@
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package org.springframework.web.client;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.PushbackInputStream;
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import org.springframework.http.HttpHeaders;
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import org.springframework.http.HttpStatus;
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import org.springframework.http.client.ClientHttpResponse;
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/**
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* Implementation of {@link ClientHttpResponse} that can not only check if the response
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* has a message body, but also if its length is 0 (i.e. empty) by actually reading the input stream.
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*
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* @author Brian Clozel
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* @since 4.1
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* @see <a href="http://tools.ietf.org/html/rfc7230#section-3.3.3">rfc7230 Section 3.3.3</a>
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*/
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class MessageBodyClientHttpResponseWrapper implements ClientHttpResponse {
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private PushbackInputStream pushbackInputStream;
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private final ClientHttpResponse response;
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public MessageBodyClientHttpResponseWrapper(ClientHttpResponse response) throws IOException {
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this.response = response;
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}
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/**
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* Indicates whether the response has a message body.
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*
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* <p>Implementation returns {@code false} for:
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* <ul>
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* <li>a response status of {@code 1XX}, {@code 204} or {@code 304}</li>
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* <li>a {@code Content-Length} header of {@code 0}</li>
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* </ul>
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*
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* @return {@code true} if the response has a message body, {@code false} otherwise
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* @throws IOException in case of I/O errors
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*/
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public boolean hasMessageBody() throws IOException {
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HttpStatus responseStatus = this.getStatusCode();
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if (responseStatus.is1xxInformational() || responseStatus == HttpStatus.NO_CONTENT ||
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responseStatus == HttpStatus.NOT_MODIFIED) {
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return false;
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}
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else if(this.getHeaders().getContentLength() == 0) {
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return false;
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}
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return true;
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}
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/**
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* Indicates whether the response has an empty message body.
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*
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* <p>Implementation tries to read the first bytes of the response stream:
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* <ul>
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* <li>if no bytes are available, the message body is empty</li>
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* <li>otherwise it is not empty and the stream is reset to its start for further reading</li>
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* </ul>
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*
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* @return {@code true} if the response has a zero-length message body, {@code false} otherwise
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* @throws IOException in case of I/O errors
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*/
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public boolean hasEmptyMessageBody() throws IOException {
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InputStream body = this.response.getBody();
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if (body == null) {
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return true;
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}
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else if (body.markSupported()) {
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body.mark(1);
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if (body.read() == -1) {
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return true;
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}
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else {
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body.reset();
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return false;
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}
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}
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else {
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this.pushbackInputStream = new PushbackInputStream(body);
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int b = pushbackInputStream.read();
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if (b == -1) {
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return true;
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}
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else {
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pushbackInputStream.unread(b);
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return false;
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}
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}
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}
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@Override
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public HttpStatus getStatusCode() throws IOException {
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return response.getStatusCode();
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}
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@Override
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public int getRawStatusCode() throws IOException {
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return response.getRawStatusCode();
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}
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@Override
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public String getStatusText() throws IOException {
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return response.getStatusText();
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}
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@Override
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public void close() {
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response.close();
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}
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@Override
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public InputStream getBody() throws IOException {
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return this.pushbackInputStream != null ? this.pushbackInputStream : response.getBody();
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}
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@Override
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public HttpHeaders getHeaders() {
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return response.getHeaders();
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}
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}
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@ -16,6 +16,7 @@
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package org.springframework.web.client;
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import java.io.ByteArrayInputStream;
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import java.io.IOException;
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import java.lang.reflect.Type;
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import java.util.ArrayList;
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@ -26,6 +27,7 @@ import org.junit.Test;
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import org.springframework.core.ParameterizedTypeReference;
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import org.springframework.http.HttpHeaders;
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import org.springframework.http.HttpInputMessage;
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import org.springframework.http.HttpStatus;
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import org.springframework.http.MediaType;
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import org.springframework.http.client.ClientHttpResponse;
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@ -73,6 +75,17 @@ public class HttpMessageConverterExtractorTests {
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assertNull(result);
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}
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@Test
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public void informational() throws IOException {
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HttpMessageConverter<?> converter = mock(HttpMessageConverter.class);
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extractor = new HttpMessageConverterExtractor<String>(String.class, createConverterList(converter));
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given(response.getStatusCode()).willReturn(HttpStatus.CONTINUE);
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Object result = extractor.extractData(response);
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assertNull(result);
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}
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@Test
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public void zeroContentLength() throws IOException {
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HttpMessageConverter<?> converter = mock(HttpMessageConverter.class);
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@ -87,6 +100,22 @@ public class HttpMessageConverterExtractorTests {
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assertNull(result);
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}
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@Test
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@SuppressWarnings("unchecked")
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public void emptyMessageBody() throws IOException {
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HttpMessageConverter<String> converter = mock(HttpMessageConverter.class);
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List<HttpMessageConverter<?>> converters = new ArrayList<HttpMessageConverter<?>>();
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converters.add(converter);
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HttpHeaders responseHeaders = new HttpHeaders();
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extractor = new HttpMessageConverterExtractor<String>(String.class, createConverterList(converter));
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given(response.getStatusCode()).willReturn(HttpStatus.OK);
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given(response.getHeaders()).willReturn(responseHeaders);
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given(response.getBody()).willReturn(new ByteArrayInputStream("".getBytes()));
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Object result = extractor.extractData(response);
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assertNull(result);
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}
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@Test
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@SuppressWarnings("unchecked")
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public void normal() throws IOException {
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@ -100,8 +129,9 @@ public class HttpMessageConverterExtractorTests {
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extractor = new HttpMessageConverterExtractor<String>(String.class, converters);
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given(response.getStatusCode()).willReturn(HttpStatus.OK);
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given(response.getHeaders()).willReturn(responseHeaders);
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given(response.getBody()).willReturn(new ByteArrayInputStream(expected.getBytes()));
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given(converter.canRead(String.class, contentType)).willReturn(true);
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given(converter.read(String.class, response)).willReturn(expected);
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given(converter.read(eq(String.class), any(HttpInputMessage.class))).willReturn(expected);
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Object result = extractor.extractData(response);
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@ -120,28 +150,13 @@ public class HttpMessageConverterExtractorTests {
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extractor = new HttpMessageConverterExtractor<String>(String.class, converters);
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given(response.getStatusCode()).willReturn(HttpStatus.OK);
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given(response.getHeaders()).willReturn(responseHeaders);
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given(response.getBody()).willReturn(new ByteArrayInputStream("Foobar".getBytes()));
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given(converter.canRead(String.class, contentType)).willReturn(false);
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extractor.extractData(response);
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}
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@Test
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public void connectionClose() throws IOException {
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HttpMessageConverter<String> converter = mock(HttpMessageConverter.class);
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List<HttpMessageConverter<?>> converters = new ArrayList<HttpMessageConverter<?>>();
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converters.add(converter);
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HttpHeaders responseHeaders = new HttpHeaders();
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responseHeaders.setConnection("close");
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extractor = new HttpMessageConverterExtractor<String>(String.class, createConverterList(converter));
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given(response.getStatusCode()).willReturn(HttpStatus.OK);
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given(response.getHeaders()).willReturn(responseHeaders);
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Object result = extractor.extractData(response);
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assertNull(result);
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}
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@Test
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@SuppressWarnings("unchecked")
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public void generics() throws IOException {
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GenericHttpMessageConverter<String> converter = mock(GenericHttpMessageConverter.class);
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List<HttpMessageConverter<?>> converters = createConverterList(converter);
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@ -154,8 +169,9 @@ public class HttpMessageConverterExtractorTests {
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extractor = new HttpMessageConverterExtractor<List<String>>(type, converters);
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given(response.getStatusCode()).willReturn(HttpStatus.OK);
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given(response.getHeaders()).willReturn(responseHeaders);
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given(response.getBody()).willReturn(new ByteArrayInputStream(expected.getBytes()));
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given(converter.canRead(type, null, contentType)).willReturn(true);
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given(converter.read(type, null, response)).willReturn(expected);
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given(converter.read(eq(type), eq(null), any(HttpInputMessage.class))).willReturn(expected);
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Object result = extractor.extractData(response);
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@ -16,6 +16,7 @@
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package org.springframework.web.client;
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import java.io.ByteArrayInputStream;
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import java.io.IOException;
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import java.net.URI;
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import java.util.Collections;
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@ -31,6 +32,7 @@ import org.junit.Test;
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import org.springframework.core.ParameterizedTypeReference;
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import org.springframework.http.HttpEntity;
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import org.springframework.http.HttpHeaders;
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import org.springframework.http.HttpInputMessage;
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import org.springframework.http.HttpMethod;
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import org.springframework.http.HttpStatus;
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import org.springframework.http.MediaType;
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@ -170,14 +172,15 @@ public class RestTemplateTests {
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given(request.getHeaders()).willReturn(requestHeaders);
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given(request.execute()).willReturn(response);
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given(errorHandler.hasError(response)).willReturn(false);
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String expected = "Hello World";
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HttpHeaders responseHeaders = new HttpHeaders();
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responseHeaders.setContentType(textPlain);
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responseHeaders.setContentLength(10);
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given(response.getStatusCode()).willReturn(HttpStatus.OK);
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given(response.getHeaders()).willReturn(responseHeaders);
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given(response.getBody()).willReturn(new ByteArrayInputStream(expected.getBytes()));
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given(converter.canRead(String.class, textPlain)).willReturn(true);
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String expected = "Hello World";
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given(converter.read(String.class, response)).willReturn(expected);
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given(converter.read(eq(String.class), any(HttpInputMessage.class))).willReturn(expected);
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HttpStatus status = HttpStatus.OK;
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given(response.getStatusCode()).willReturn(status);
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given(response.getStatusText()).willReturn(status.getReasonPhrase());
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@ -205,6 +208,7 @@ public class RestTemplateTests {
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responseHeaders.setContentLength(10);
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given(response.getStatusCode()).willReturn(HttpStatus.OK);
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given(response.getHeaders()).willReturn(responseHeaders);
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given(response.getBody()).willReturn(new ByteArrayInputStream("Foo".getBytes()));
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given(converter.canRead(String.class, contentType)).willReturn(false);
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HttpStatus status = HttpStatus.OK;
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given(response.getStatusCode()).willReturn(status);
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@ -232,14 +236,15 @@ public class RestTemplateTests {
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given(request.getHeaders()).willReturn(requestHeaders);
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given(request.execute()).willReturn(response);
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given(errorHandler.hasError(response)).willReturn(false);
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String expected = "Hello World";
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HttpHeaders responseHeaders = new HttpHeaders();
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responseHeaders.setContentType(textPlain);
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responseHeaders.setContentLength(10);
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given(response.getStatusCode()).willReturn(HttpStatus.OK);
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given(response.getHeaders()).willReturn(responseHeaders);
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given(response.getBody()).willReturn(new ByteArrayInputStream(expected.getBytes()));
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given(converter.canRead(String.class, textPlain)).willReturn(true);
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String expected = "Hello World";
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given(converter.read(String.class, response)).willReturn(expected);
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given(converter.read(eq(String.class), any(HttpInputMessage.class))).willReturn(expected);
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given(response.getStatusCode()).willReturn(HttpStatus.OK);
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HttpStatus status = HttpStatus.OK;
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given(response.getStatusCode()).willReturn(status);
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@ -405,14 +410,15 @@ public class RestTemplateTests {
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converter.write(request, null, this.request);
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given(this.request.execute()).willReturn(response);
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given(errorHandler.hasError(response)).willReturn(false);
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Integer expected = 42;
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HttpHeaders responseHeaders = new HttpHeaders();
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responseHeaders.setContentType(textPlain);
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responseHeaders.setContentLength(10);
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given(response.getStatusCode()).willReturn(HttpStatus.OK);
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given(response.getHeaders()).willReturn(responseHeaders);
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Integer expected = 42;
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given(response.getBody()).willReturn(new ByteArrayInputStream(expected.toString().getBytes()));
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given(converter.canRead(Integer.class, textPlain)).willReturn(true);
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given(converter.read(Integer.class, response)).willReturn(expected);
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given(converter.read(eq(Integer.class), any(HttpInputMessage.class))).willReturn(expected);
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HttpStatus status = HttpStatus.OK;
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given(response.getStatusCode()).willReturn(status);
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given(response.getStatusText()).willReturn(status.getReasonPhrase());
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@ -437,14 +443,15 @@ public class RestTemplateTests {
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converter.write(request, null, this.request);
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given(this.request.execute()).willReturn(response);
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given(errorHandler.hasError(response)).willReturn(false);
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Integer expected = 42;
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HttpHeaders responseHeaders = new HttpHeaders();
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responseHeaders.setContentType(textPlain);
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responseHeaders.setContentLength(10);
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given(response.getStatusCode()).willReturn(HttpStatus.OK);
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given(response.getHeaders()).willReturn(responseHeaders);
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Integer expected = 42;
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given(response.getBody()).willReturn(new ByteArrayInputStream(expected.toString().getBytes()));
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given(converter.canRead(Integer.class, textPlain)).willReturn(true);
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given(converter.read(Integer.class, response)).willReturn(expected);
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given(converter.read(eq(Integer.class), any(HttpInputMessage.class))).willReturn(expected);
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given(response.getStatusCode()).willReturn(HttpStatus.OK);
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HttpStatus status = HttpStatus.OK;
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given(response.getStatusCode()).willReturn(status);
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@ -615,14 +622,16 @@ public class RestTemplateTests {
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converter.write(body, null, this.request);
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given(this.request.execute()).willReturn(response);
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given(errorHandler.hasError(response)).willReturn(false);
|
||||
Integer expected = 42;
|
||||
HttpHeaders responseHeaders = new HttpHeaders();
|
||||
responseHeaders.setContentType(MediaType.TEXT_PLAIN);
|
||||
responseHeaders.setContentLength(10);
|
||||
given(response.getStatusCode()).willReturn(HttpStatus.OK);
|
||||
given(response.getHeaders()).willReturn(responseHeaders);
|
||||
Integer expected = 42;
|
||||
given(response.getBody()).willReturn(new ByteArrayInputStream(expected.toString().getBytes()));
|
||||
given(converter.canRead(Integer.class, MediaType.TEXT_PLAIN)).willReturn(true);
|
||||
given(converter.read(Integer.class, response)).willReturn(expected);
|
||||
given(converter.read(eq(Integer.class), any(HttpInputMessage.class))).willReturn(expected);
|
||||
given(response.getStatusCode()).willReturn(HttpStatus.OK);
|
||||
HttpStatus status = HttpStatus.OK;
|
||||
given(response.getStatusCode()).willReturn(status);
|
||||
|
|
@ -658,14 +667,15 @@ public class RestTemplateTests {
|
|||
converter.write(requestBody, null, this.request);
|
||||
given(this.request.execute()).willReturn(response);
|
||||
given(errorHandler.hasError(response)).willReturn(false);
|
||||
List<Integer> expected = Collections.singletonList(42);
|
||||
HttpHeaders responseHeaders = new HttpHeaders();
|
||||
responseHeaders.setContentType(MediaType.TEXT_PLAIN);
|
||||
responseHeaders.setContentLength(10);
|
||||
given(response.getStatusCode()).willReturn(HttpStatus.OK);
|
||||
given(response.getHeaders()).willReturn(responseHeaders);
|
||||
List<Integer> expected = Collections.singletonList(42);
|
||||
given(response.getBody()).willReturn(new ByteArrayInputStream(new Integer(42).toString().getBytes()));
|
||||
given(converter.canRead(intList.getType(), null, MediaType.TEXT_PLAIN)).willReturn(true);
|
||||
given(converter.read(intList.getType(), null, response)).willReturn(expected);
|
||||
given(converter.read(eq(intList.getType()), eq(null), any(HttpInputMessage.class))).willReturn(expected);
|
||||
given(response.getStatusCode()).willReturn(HttpStatus.OK);
|
||||
HttpStatus status = HttpStatus.OK;
|
||||
given(response.getStatusCode()).willReturn(status);
|
||||
|
|
|
|||
Loading…
Reference in New Issue