如何在 Spring Boot 中启用 HTTP 响应缓存 [英] How to enable HTTP response caching in Spring Boot

问题描述

我已经使用 Spring Boot 1.0.2 实现了一个 REST 服务器.我无法阻止 Spring 设置禁用 HTTP 缓存的 HTTP 标头.

I have implemented a REST server using Spring Boot 1.0.2. I'm having trouble preventing Spring from setting HTTP headers that disable HTTP caching.

我的控制器如下:

@Controller
public class MyRestController {
    @RequestMapping(value = "/someUrl", method = RequestMethod.GET)
    public @ResponseBody ResponseEntity<String> myMethod(
            HttpServletResponse httpResponse) throws SQLException {
        return new ResponseEntity<String>("{}", HttpStatus.OK);
    }
}

所有 HTTP 响应都包含以下标头:

All HTTP responses contain the following headers:

Cache-Control: no-cache, no-store, max-age=0, must-revalidate
Expires: 0
Pragma: no-cache

我尝试了以下方法来删除或更改这些标题:

I've tried the following to remove or change those headers:

1. 在控制器中调用 setCacheSeconds(-1).
2. 在控制器中调用 httpResponse.setHeader("Cache-Control", "max-age=123").
3. 定义返回 WebContentInterceptor 的 @Bean，我为其调用了 setCacheSeconds(-1).
4. 在 application.properties 中将属性 spring.resources.cache-period 设置为 -1 或正值.

1. Call setCacheSeconds(-1) in the controller.
2. Call httpResponse.setHeader("Cache-Control", "max-age=123") in the controller.
3. Define @Bean that returns WebContentInterceptor for which I've called setCacheSeconds(-1).
4. Set property spring.resources.cache-period to -1 or a positive value in application.properties.

以上都没有任何影响.如何在 Spring Boot 中为所有或单个请求禁用或更改这些标头?

None of the above have had any effect. How do I disable or change these headers for all or individual requests in Spring Boot?

推荐答案

原来无缓存 HTTP 标头是由 Spring Security 设置的.这在 http://docs.spring 中讨论.io/spring-security/site/docs/current/reference/htmlsingle/#headers.

Turns out the no-cache HTTP headers are set by Spring Security. This is discussed in http://docs.spring.io/spring-security/site/docs/current/reference/htmlsingle/#headers.

以下内容禁用了 HTTP 响应标头 Pragma: no-cache，但不能以其他方式解决问题:

The following disables the HTTP response header Pragma: no-cache, but doesn't otherwise solve the problem:

import org.springframework.context.annotation.Configuration;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
import org.springframework.security.config.annotation.web.servlet.configuration.EnableWebMvcSecurity;

@Configuration
@EnableWebMvcSecurity
public class SecurityConfig extends WebSecurityConfigurerAdapter {
    @Override
    protected void configure(HttpSecurity http) throws Exception {
        // Prevent the HTTP response header of "Pragma: no-cache".
        http.headers().cacheControl().disable();
    }
}

我最终为公共静态资源完全禁用了 Spring Security，如下所示(在与上面相同的类中):

I ended up disabling Spring Security completely for public static resources as following (in the same class as above):

@Override
public void configure(WebSecurity web) throws Exception {
    web.ignoring().antMatchers("/static/public/**");
}

这需要配置两个资源处理程序才能正确获取缓存控制标头:

This requires configuring two resource handlers to get cache control headers right:

@Configuration
public class MvcConfigurer extends WebMvcConfigurerAdapter
        implements EmbeddedServletContainerCustomizer {
    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        // Resources without Spring Security. No cache control response headers.
        registry.addResourceHandler("/static/public/**")
            .addResourceLocations("classpath:/static/public/");

        // Resources controlled by Spring Security, which
        // adds "Cache-Control: must-revalidate".
        registry.addResourceHandler("/static/**")
            .addResourceLocations("classpath:/static/")
            .setCachePeriod(3600*24);
    }
}

另见 在 Spring Boot 中提供静态 Web 资源&Spring Security 应用程序.

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