Introduce configuration property for strict servlet compliance

The property is named spring.servlet.multipart.strict-servlet-compliance

See gh-37242

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/servlet/MultipartAutoConfiguration.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2022 the original author or authors.
+ * Copyright 2012-2023 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.
@@ -46,6 +46,7 @@ import org.springframework.web.servlet.DispatcherServlet;
  * @author Greg Turnquist
  * @author Josh Long
  * @author Toshiaki Maki
+ * @author Yanming Zhou
  * @since 2.0.0
  */
 @AutoConfiguration
@@ -72,6 +73,7 @@ public class MultipartAutoConfiguration {
 	public StandardServletMultipartResolver multipartResolver() {
 		StandardServletMultipartResolver multipartResolver = new StandardServletMultipartResolver();
 		multipartResolver.setResolveLazily(this.multipartProperties.isResolveLazily());
+		multipartResolver.setStrictServletCompliance(this.multipartProperties.isStrictServletCompliance());
 		return multipartResolver;
 	}
 

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/servlet/MultipartProperties.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2021 the original author or authors.
+ * Copyright 2012-2023 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.
@@ -43,6 +43,7 @@ import org.springframework.util.unit.DataSize;
  * @author Josh Long
  * @author Toshiaki Maki
  * @author Stephane Nicoll
+ * @author Yanming Zhou
  * @since 2.0.0
  */
 @ConfigurationProperties(prefix = "spring.servlet.multipart", ignoreUnknownFields = false)
@@ -79,6 +80,12 @@ public class MultipartProperties {
 	 */
 	private boolean resolveLazily = false;
 
+	/**
+	 * Whether to resolve the multipart request strictly comply with the Servlet specification,
+	 * only kicking in for "multipart/form-data" requests.
+	 */
+	private boolean strictServletCompliance = false;
+
 	public boolean getEnabled() {
 		return this.enabled;
 	}
@@ -127,6 +134,14 @@ public class MultipartProperties {
 		this.resolveLazily = resolveLazily;
 	}
 
+	public boolean isStrictServletCompliance() {
+		return this.strictServletCompliance;
+	}
+
+	public void setStrictServletCompliance(boolean strictServletCompliance) {
+		this.strictServletCompliance = strictServletCompliance;
+	}
+
 	/**
 	 * Create a new {@link MultipartConfigElement} using the properties.
 	 * @return a new {@link MultipartConfigElement} configured using there properties

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/web/servlet/MultipartAutoConfigurationTests.java

@@ -64,6 +64,7 @@ import static org.mockito.Mockito.mock;
  * @author Josh Long
  * @author Ivan Sopov
  * @author Toshiaki Maki
+ * @author Yanming Zhou
  */
 @DirtiesUrlFactories
 class MultipartAutoConfigurationTests {
@@ -174,6 +175,17 @@ class MultipartAutoConfigurationTests {
 		assertThat(multipartResolver).hasFieldOrPropertyWithValue("resolveLazily", true);
 	}
 
+	@Test
+	void configureStrictServletCompliance() {
+		this.context = new AnnotationConfigServletWebServerApplicationContext();
+		TestPropertyValues.of("spring.servlet.multipart.strict-servlet-compliance=true").applyTo(this.context);
+		this.context.register(WebServerWithNothing.class, BaseConfiguration.class);
+		this.context.refresh();
+		StandardServletMultipartResolver multipartResolver = this.context
+				.getBean(StandardServletMultipartResolver.class);
+		assertThat(multipartResolver).hasFieldOrPropertyWithValue("strictServletCompliance", true);
+	}
+
 	@Test
 	void configureMultipartProperties() {
 		this.context = new AnnotationConfigServletWebServerApplicationContext();