<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.5.2</version>
        <relativePath /> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>rest-service-complete</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>rest-service-complete</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>1.8</java.version>
+       <log4j2.version>2.14.0</log4j2.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
+       <dependency>
+           <groupId>org.springframework.boot</groupId>
+           <artifactId>spring-boot-starter</artifactId>
+           <exclusions>
+               <exclusion>
+                   <groupId>org.springframework.boot</groupId>
+                   <artifactId>spring-boot-starter-logging</artifactId>
+               </exclusion>
+           </exclusions>
+       </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-log4j2</artifactId>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

package com.example.restservice;

import java.util.concurrent.atomic.AtomicLong;

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

 
+ import java.util.Map;
+ import org.slf4j.Logger;
+ import org.slf4j.LoggerFactory;
+ import org.springframework.web.bind.annotation.RequestHeader;


@RestController
public class GreetingController {


+   static protected Logger logger = LoggerFactory.getLogger(GreetingController.class);

    private static final String template = "Hello, %s!";
    private final AtomicLong counter = new AtomicLong();

    @GetMapping("/greeting")
-   public Greeting greeting(@RequestParam(value = "name", defaultValue = "World") String name) {
+   public Greeting greeting(@RequestParam(value = "name", defaultValue = "World") String name,
+           @RequestHeader Map<String, String> headers) {
+
+       headers.forEach((key, value) -> {
+           logger.info(String.format("Header '%s' = %s", key, value));
+       });

        return new Greeting(counter.incrementAndGet(), String.format(template, name));
    }
}