springboot之http头中返回码-301,302,304

川长思鸟来 2022-11-28 13:19 188阅读 0赞

3xx-返回码简单介绍

301：资源已经永久迁到新的地址，新的URL会在响应头中返回
    302：资源临时被迁到新的地址，新的URL会在响应头中返回
    304：表明资源未改变。主要配合请求头中的If-None-Match和If-Modified-Since使用

1.pom.xml

<?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 http://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>2.2.4.RELEASE</version>
            <relativePath/> 
        </parent>
    
        <groupId>com.ma</groupId>
        <artifactId>demo</artifactId>
        <version>1.0-SNAPSHOT</version>
        <packaging>jar</packaging>
    
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
        </dependencies>
    </project>

2.启动类配置

package com.ma.demo;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.context.annotation.Bean;
    import org.springframework.web.filter.OncePerRequestFilter;
    import org.springframework.web.filter.ShallowEtagHeaderFilter;
    
    /**
     * created by <a href="mailto:18045142590@163.com" > mameng </a>
     */
    @SpringBootApplication
    public class DemoApplication {
        public static void main(String[] args) {
            SpringApplication.run(DemoApplication.class, args);
        }
    
        @Bean
        public OncePerRequestFilter shallowEtagHeaderFilter() {
            return new ShallowEtagHeaderFilter();
        }
    }

3.DemoController

package com.ma.demo;
    
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    import javax.servlet.http.HttpServletResponse;
    import java.util.Date;
    
    /**
     * created by <a href="mailto:18045142590@163.com" > mameng </a>
     */
    @RestController
    public class DemoController {
    
        @GetMapping("/demo")
        public String demo() {
            return "demo";
        }
    
        @GetMapping("/demo2")
        public String dem2() {
            return new Date().toString();
        }
    
        @GetMapping("/301")
        public void d301(HttpServletResponse response) {
            response.setStatus(301);
            response.setHeader("Location", "http://localhost:8080/demo2");
        }
    
        @GetMapping("/302")
        public void p(HttpServletResponse response) {
            response.setStatus(302);
            response.setHeader("Location", "http://localhost:8080/demo2");
        }
    }

4.启动启动类

304 - GET [http://localhost:8080/demo][http_localhost_8080_demo]，两次相同的请求，第一次返回码为200，第二次返回码为304，请注意http头中的If-No-Match和Etag标记

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzM3NzMyODI5_size_16_color_FFFFFF_t_70][]

301 - GET [http://localhost:8080/3][http_localhost_8080_demo]01

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzM3NzMyODI5_size_16_color_FFFFFF_t_70 1][]

302 - GET [http://localhost:8080/3][http_localhost_8080_demo]02

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzM3NzMyODI5_size_16_color_FFFFFF_t_70 2][]

301/302中请注意http头中的Referer字段.

参考链接

[SEO 之 SpringMVC redirect 301，301和302区别详细讲解][SEO _ SpringMVC redirect 301_301_302]

[spring boot etag header example][]

[http_localhost_8080_demo]: http://localhost:8080/demo
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzM3NzMyODI5_size_16_color_FFFFFF_t_70]: /images/20221124/24a1e093e1ce4d2d901f340c3066aa36.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzM3NzMyODI5_size_16_color_FFFFFF_t_70 1]: /images/20221124/b4b6cffb0f4a46beaf39705233afd63e.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzM3NzMyODI5_size_16_color_FFFFFF_t_70 2]: /images/20221124/a3118290360943ffbdcd8f0cfd38c933.png
[SEO _ SpringMVC redirect 301_301_302]: https://www.sojson.com/blog/323.html
[spring boot etag header example]: https://www.pianshen.com/article/4565622/