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add interceptor
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‎interceptor/.gitignore

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/target
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/node_modules
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.gradle
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/build/
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/yarn-error.log
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# Ignore Gradle GUI config
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gradle-app.setting
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# Avoid ignoring Gradle wrapper jar file (.jar files are usually ignored)
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!gradle-wrapper.jar
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# Cache of project
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.gradletasknamecache
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# User-specific stuff:
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.idea/**/workspace.xml
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.idea/**/tasks.xml
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.idea/dictionaries
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.idea/artifacts
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# Sensitive or high-churn files:
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.idea/**/dataSources/
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.idea/**/dataSources.ids
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.idea/**/dataSources.xml
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.idea/**/dataSources.local.xml
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.idea/**/sqlDataSources.xml
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.idea/**/dynamic.xml
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.idea/**/uiDesigner.xml
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.idea/inspectionProfiles
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# Gradle:
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.idea/**/gradle.xml
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.idea/**/libraries
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# CMake
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cmake-build-debug/
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# Mongo Explorer plugin:
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.idea/**/mongoSettings.xml
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## File-based project format:
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*.iws
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## Plugin-specific files:
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# IntelliJ
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/out/
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# mpeltonen/sbt-idea plugin
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.idea_modules/
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# JIRA plugin
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atlassian-ide-plugin.xml
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# Cursive Clojure plugin
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.idea/replstate.xml
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# Ruby plugin and RubyMine
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/.rakeTasks
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# Crashlytics plugin (for Android Studio and IntelliJ)
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com_crashlytics_export_strings.xml
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crashlytics.properties
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crashlytics-build.properties
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fabric.properties
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### JetBrains Patch ###
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# Comment Reason: https://github.com/joeblau/gitignore.io/issues/186#issuecomment-215987721
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# *.iml
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# modules.xml
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.idea/misc.xml
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# *.ipr
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# Sonarlint plugin
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.idea/sonarlint
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/.idea/.name
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/config.properties
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/src/main/webapp/manifest.json
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/src/main/resources/db.properties
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/src/test/resources/db-test.properties
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/log.log

‎interceptor/.idea/compiler.xml

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‎interceptor/.idea/encodings.xml

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‎interceptor/.idea/modules.xml

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‎interceptor/interceptor.iml

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<?xml version="1.0" encoding="UTF-8"?>
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<module org.jetbrains.idea.maven.project.MavenProjectsManager.isMavenModule="true" type="JAVA_MODULE" version="4">
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<configuration>
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<webroots />
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<root url="file://$MODULE_DIR$/src/main/java" />
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<root url="file://$MODULE_DIR$/src/main/resources" />
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<content url="file://$MODULE_DIR$">
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‎interceptor/pom.xml

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>org.springframework</groupId>
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<artifactId>interceptor</artifactId>
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<version>0.1.0</version>
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<parent>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-parent</artifactId>
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<version>2.0.5.RELEASE</version>
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</parent>
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<dependencies>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-web</artifactId>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-thymeleaf</artifactId>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-devtools</artifactId>
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<optional>true</optional>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-test</artifactId>
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<scope>test</scope>
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</dependency>
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</dependencies>
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<properties>
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<java.version>1.8</java.version>
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</properties>
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<build>
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<plugins>
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<plugin>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-maven-plugin</artifactId>
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</plugin>
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</plugins>
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</build>
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</project>

‎interceptor/readme.md

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# Interceptors in Spring Boot
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Spring Interceptors has the ability to pre-handle and post-handle the web requests. Each interceptor class should extend the HandlerInterceptorAdapter class
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## How connect interceptor
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To add our interceptors into Spring configuration, we need to override addInterceptors() method inside WebConfig class that implements WebMvcConfigurer:
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```
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@Configuration
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public class AppConfig implements WebMvcConfigurer {
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@Override
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public void addInterceptors(InterceptorRegistry registry) {
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registry.addInterceptor(new OurSuperInterceptor());
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}
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}
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```
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## Examples
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#### 1. Use predefined interceptor for change language `LocaleChangeInterceptor`
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See `/src/main/java/examples/AppConfig.java`
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#### 2. Create custom interceptor - LoggerInterceptor
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see `/src/main/java/examples/interceptor/LoggerInterceptor.java`

‎interceptor/src/main/java/examples/AppConfig.java

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package examples;
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import examples.interceptor.LoggerInterceptor;
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import org.springframework.context.annotation.Bean;
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import org.springframework.context.annotation.Configuration;
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import org.springframework.web.servlet.LocaleResolver;
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import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
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import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
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import org.springframework.web.servlet.i18n.LocaleChangeInterceptor;
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import org.springframework.web.servlet.i18n.SessionLocaleResolver;
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import java.util.Locale;
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@Configuration
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public class AppConfig implements WebMvcConfigurer {
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@Bean
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public LocaleResolver localeResolver() {
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SessionLocaleResolver sessionLocaleResolver = new SessionLocaleResolver();
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sessionLocaleResolver.setDefaultLocale(Locale.US);
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return sessionLocaleResolver;
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}
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@Bean
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public LocaleChangeInterceptor localeChangeInterceptor() {
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LocaleChangeInterceptor lci = new LocaleChangeInterceptor();
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lci.setParamName("lang");
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return lci;
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}
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@Bean
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public LoggerInterceptor loggerInterceptor() {
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return new LoggerInterceptor();
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}
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@Override
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public void addInterceptors(InterceptorRegistry registry) {
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registry.addInterceptor(localeChangeInterceptor());
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registry.addInterceptor(loggerInterceptor());
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}
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}

‎interceptor/src/main/java/examples/Application.java

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package examples;
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import org.springframework.boot.SpringApplication;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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@SpringBootApplication
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public class Application {
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public static void main(String[] args) {
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SpringApplication.run(Application.class, args);
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}
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}

‎interceptor/src/main/java/examples/controller/HomeController.java

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package examples.controller;
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import org.springframework.stereotype.Controller;
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import org.springframework.web.bind.annotation.GetMapping;
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@Controller
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public class HomeController {
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@GetMapping({"/", "/home"})
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public String main() {
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return "home";
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}
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}

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