Fix filtered HTTP headers in data binding

Prior to this commit, several common HTTP headers were ignored from the
data binding process when collecting property values, in gh-34039 and
gh-34182.

This commit completes the initial enhancement by ensuring that the
default header predicate is also considering cases where constructor
binding is applied and the Java type has a lowercase variant of the HTTP
header name to filter.

Fixes gh-34292

spring-webmvc/src/test/java/org/springframework/web/servlet/mvc/method/annotation/ExtendedServletRequestDataBinderTests.java

@@ -27,6 +27,7 @@ import org.junit.jupiter.params.provider.ValueSource;
 import org.springframework.beans.MutablePropertyValues;
 import org.springframework.beans.testfixture.beans.TestBean;
 import org.springframework.core.ResolvableType;
+import org.springframework.validation.BindingResult;
 import org.springframework.web.bind.ServletRequestDataBinder;
 import org.springframework.web.bind.annotation.BindParam;
 import org.springframework.web.bind.support.BindParamNameResolver;
@@ -36,7 +37,7 @@ import org.springframework.web.testfixture.servlet.MockHttpServletRequest;
 import static org.assertj.core.api.Assertions.assertThat;
 
 /**
- * Test fixture for {@link ExtendedServletRequestDataBinder}.
+ * Tests for {@link ExtendedServletRequestDataBinder}.
  *
  * @author Rossen Stoyanchev
  */
@@ -136,6 +137,19 @@ class ExtendedServletRequestDataBinderTests {
 		assertThat(bean.someIntArray()).isNull();
 	}
 
+	@Test
+	void filteredPriorityHeaderForConstructorBinding() {
+		TestBinder binder = new TestBinder();
+		binder.setTargetType(ResolvableType.forClass(TestTarget.class));
+		request.addHeader("Priority", "u1");
+
+		binder.construct(request);
+		BindingResult result = binder.getBindingResult();
+		TestTarget target = (TestTarget) result.getTarget();
+
+		assertThat(target.priority).isNull();
+	}
+
 	@Test
 	void headerPredicate() {
 		TestBinder binder = new TestBinder();
@@ -179,4 +193,14 @@ class ExtendedServletRequestDataBinderTests {
 		}
 	}
 
+	static class TestTarget {
+
+		final String priority;
+
+		public TestTarget(String priority) {
+			this.priority = priority;
+		}
+
+	}
+
 }