Add redirects method to RestTemplateBuilder

Add a `redirects` method to `RestTemplateBuilder` to make
it easier to apply an existing `ClientHttpRequestFactorySettings`
instance.

Author: quaff

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/client/RestTemplateBuilder.java

@@ -33,6 +33,7 @@
 import org.springframework.beans.BeanUtils;
 import org.springframework.boot.http.client.ClientHttpRequestFactoryBuilder;
 import org.springframework.boot.http.client.ClientHttpRequestFactorySettings;
+import org.springframework.boot.http.client.ClientHttpRequestFactorySettings.Redirects;
 import org.springframework.boot.ssl.SslBundle;
 import org.springframework.http.client.ClientHttpRequest;
 import org.springframework.http.client.ClientHttpRequestFactory;
@@ -64,6 +65,7 @@
  * @author Kevin Strijbos
  * @author Ilya Lukyanovich
  * @author Scott Frederick
+ * @author Yanming Zhou
  * @since 1.4.0
  */
 public class RestTemplateBuilder {
@@ -501,6 +503,19 @@ public RestTemplateBuilder readTimeout(Duration readTimeout) {
 				this.defaultHeaders, this.customizers, this.requestCustomizers);
 	}
 
+	/**
+	 * Sets the redirect strategy on the underlying {@link ClientHttpRequestFactory}.
+	 * @param redirects the redirect strategy
+	 * @return a new builder instance.
+	 * @since 3.4.1
+	 */
+	public RestTemplateBuilder redirects(Redirects redirects) {
+		return new RestTemplateBuilder(this.requestFactorySettings.withRedirects(redirects), this.detectRequestFactory,
+				this.rootUri, this.messageConverters, this.interceptors, this.requestFactoryBuilder,
+				this.uriTemplateHandler, this.errorHandler, this.basicAuthentication, this.defaultHeaders,
+				this.customizers, this.requestCustomizers);
+	}
+
 	/**
 	 * Sets the SSL bundle on the underlying {@link ClientHttpRequestFactory}.
 	 * @param sslBundle the SSL bundle

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/web/client/RestTemplateBuilderTests.java

@@ -32,6 +32,7 @@
 import org.mockito.junit.jupiter.MockitoExtension;
 
 import org.springframework.boot.http.client.ClientHttpRequestFactorySettings;
+import org.springframework.boot.http.client.ClientHttpRequestFactorySettings.Redirects;
 import org.springframework.http.HttpHeaders;
 import org.springframework.http.HttpMethod;
 import org.springframework.http.MediaType;
@@ -73,6 +74,7 @@
  * @author Kevin Strijbos
  * @author Ilya Lukyanovich
  * @author Brian Clozel
+ * @author Yanming Zhou
  */
 @ExtendWith(MockitoExtension.class)
 class RestTemplateBuilderTests {
@@ -486,6 +488,13 @@ void unwrappingDoesNotAffectRequestFactoryThatIsSetOnTheBuiltTemplate() {
 		assertThat(template.getRequestFactory()).isInstanceOf(BufferingClientHttpRequestFactory.class);
 	}
 
+	@Test
+	void configureRedirects() {
+		assertThat(this.builder.redirects(Redirects.DONT_FOLLOW)).extracting("requestFactorySettings")
+			.extracting("redirects")
+			.isSameAs(Redirects.DONT_FOLLOW);
+	}
+
 	private ClientHttpRequest createRequest(RestTemplate template) {
 		return ReflectionTestUtils.invokeMethod(template, "createRequest", URI.create("http://localhost"),
 				HttpMethod.GET);