The request body is being printed out only if the content type is set to application/x-www-form-urlencoded. Not otherwise.

[ghost]

Describe the bug

The request body is being printed out only if the content type is set to application/x-www-form-urlencoded. Otherwise, it will not be printed. Am I missing to include some extra dependencies or maybe some required configuration is missing?

To Reproduce

build.gradle:

plugins {
    id 'java'
    id 'org.springframework.boot' version '3.0.6'
    id 'io.spring.dependency-management' version '1.1.0'
}

group = 'com.example'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = '17'

repositories {
    mavenCentral()
}

dependencies {
    implementation 'dev.akkinoc.spring.boot:logback-access-spring-boot-starter:4.0.0'

    implementation 'org.springframework.boot:spring-boot-starter-web'
    testImplementation 'org.springframework.boot:spring-boot-starter-test'
}

tasks.named('test') {
    useJUnitPlatform()
}

application.yml:

logging:
  level:
    web: "TRACE"
server:
  port: 8989
spring:
  mvc:
    log-request-details: true

logback-access.xml:

<configuration>
  <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
    <encoder>
      <pattern>%fullRequest%n%n%fullResponse</pattern>
    </encoder>
  </appender>

  <appender-ref ref="STDOUT" />
</configuration>

For example, curl -X POST localhost:8989/api/login -H "content-type: application/x-www-form-urlencoded" -d 'username=a&password=b' works as expected, while curl -X POST localhost:8989/api/login -H "content-type: application/json" -d '{"username":"a","password":"b"}' does NOT work at all - the request body is missing.

Expected behavior

It would be nice if it worked well even for some other content types, primarily for application/json.

POST /api/login HTTP/1.1
accept: */*
content-length: 21
content-type: application/json
host: localhost:8989
user-agent: curl/8.0.1

{"username":"a","password":"b"}

or even better, formatted as:

POST /api/login HTTP/1.1
accept: */*
content-length: 21
content-type: application/json
host: localhost:8989
user-agent: curl/8.0.1

{
  "username": "a",
  "password": "b"
}

Environment

• Version of this library used: 4.0.0
• Version of Java used: 17.0.7 | 20.0.1
• Version of Spring Boot used: 3.0.6
• Web server used (Tomcat, Jetty, Undertow or Netty): Tomcat
• Web application type used (Servlet Stack or Reactive Stack): Servlet Stack