Remove Http401AuthenticationEntryPoint

Closes gh-10715

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/security/Http401AuthenticationEntryPoint.java

@@ -1,53 +0,0 @@
-/*
- * Copyright 2012-2017 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.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.springframework.boot.autoconfigure.security;
-
-import java.io.IOException;
-
-import javax.servlet.ServletException;
-import javax.servlet.http.HttpServletRequest;
-import javax.servlet.http.HttpServletResponse;
-
-import org.springframework.security.core.AuthenticationException;
-import org.springframework.security.web.AuthenticationEntryPoint;
-import org.springframework.security.web.authentication.www.BasicAuthenticationEntryPoint;
-
-/**
- * AuthenticationEntryPoint that sends a 401 and Parameterized by the value of the
- * {@code WWW-Authenticate} header. Like the {@link BasicAuthenticationEntryPoint} but
- * more flexible.
- *
- * @author Dave Syer
- * @since 1.3.0
- */
-public class Http401AuthenticationEntryPoint implements AuthenticationEntryPoint {
-
-	private final String headerValue;
-
-	public Http401AuthenticationEntryPoint(String headerValue) {
-		this.headerValue = headerValue;
-	}
-
-	@Override
-	public void commence(HttpServletRequest request, HttpServletResponse response,
-			AuthenticationException authException) throws IOException, ServletException {
-		response.setHeader("WWW-Authenticate", this.headerValue);
-		response.sendError(HttpServletResponse.SC_UNAUTHORIZED,
-				authException.getMessage());
-	}
-
-}