Clean trailing slash from endpoints.web.base-path

Fixes gh-11021

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/endpoint/web/WebEndpointProperties.java

@@ -22,6 +22,7 @@ import java.util.Map;
 import java.util.Set;
 
 import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.util.StringUtils;
 
 /**
  * Configuration properties for web management endpoints.
@@ -59,7 +60,14 @@ public class WebEndpointProperties {
 	}
 
 	public void setBasePath(String basePath) {
-		this.basePath = basePath;
+		this.basePath = cleanBasePath(basePath);
+	}
+
+	private String cleanBasePath(String basePath) {
+		if (StringUtils.hasText(basePath) && basePath.endsWith("/")) {
+			return basePath.substring(0, basePath.length() - 1);
+		}
+		return basePath;
 	}
 
 	public Set<String> getExpose() {

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/endpoint/web/WebEndpointPropertiesTests.java

@@ -33,4 +33,10 @@ public class WebEndpointPropertiesTests {
 		assertThat(properties.getBasePath()).isEqualTo("/application");
 	}
 
+	@Test
+	public void basePathShouldBeCleaned() throws Exception {
+		WebEndpointProperties properties = new WebEndpointProperties();
+		properties.setBasePath("/");
+		assertThat(properties.getBasePath()).isEqualTo("");
+	}
 }