Spring serves static content as application/json no matter what

Question

I have a simple Spring Boot app with a static content. I would like the browsers to cache not all but just some of the types, like css. So I added following configuration:

@Override
public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/css/**").addResourceLocations("/css/")
                .setCacheControl(CacheControl.maxAge(365, TimeUnit.DAYS));
}

But now all the CSS files are server as Content-Type: application/json. Without this code they are served as text/css. I cannot figure out what am I doing wrong. Is there anything I should check or add?

Thanks in advance.

I've had this exact problem, and it was when the file that was requested did not exist (which can be a typo or an accidentally deleted file). When this happens, Spring returns a json response about the error, but because often 'no-sniff' is enabled, you won't see it in a browser dev tools. — Zach
– Zach, Commented Feb 3, 2021 at 15:23

venkey · Accepted Answer · 2020-02-19 18:55:42Z

0

you have to mention extension of the file name like *.css want to cache

@Configuration
public class BaseMvcConfig extends WebMvcConfigurerAdapter {
    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/static/css/*.css").addResourceLocations("classpath:/static/").setCachePeriod(24 * 3600 * 365); 
registry.addResourceHandler("/static/js/*.js").addResourceLocations("classpath:/static/").setCachePeriod(0); 

}
}

answered Feb 19, 2020 at 18:55

venkey

666 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

merlik Over a year ago

I made myself not clear. The files are cached with this code, but they are not served as text/css anymore but as application/json. And this causes me problems.

venkey Over a year ago

i think your missing the type attribute in Html can you please check type="text/css" ex:- <link href="css/main.css" rel="stylesheet" type="text/css">` try below one

merlik Over a year ago

The html already contains: <link rel="stylesheet" type="text/css" href="css/test.css">, but I don't think this should do the trick. With the configuration, the response headers for GET css/test.css contain `Content-type: application/json' and expiration in one year. If I remove this configuration, the reposnse headers contain 'Content-type: text/css' and 'Expire: 0' (and several others for not caching the content). So I assume this configuration somehow messes with mime-types, but I am not able to figure out how.

merlik · Accepted Answer · 2020-02-24 12:16:51Z

I have resolved this by adding @EnableWebMvc annotation and applying this configuration by:

@Override
public void addResourceHandlers(ResourceHandlerRegistry registry) {
    registry.addResourceHandler("/css/*.css")
            .addResourceLocations("classpath:/static/css/")
            .setCacheControl(CacheControl.maxAge(365, TimeUnit.DAYS))
            .resourceChain(true).addResolver(new PathResourceResolver());
    registry.addResourceHandler("/js/**")
            .addResourceLocations("classpath:/static/js/")
            .setCacheControl(CacheControl.maxAge(365, TimeUnit.DAYS))
            .resourceChain(true).addResolver(new PathResourceResolver());
    registry.addResourceHandler("/img/**")
            .addResourceLocations("classpath:/static/img/")
            .setCacheControl(CacheControl.maxAge(365, TimeUnit.DAYS))
            .resourceChain(true).addResolver(new PathResourceResolver());
    registry.addResourceHandler("/*.html")
            .addResourceLocations("classpath:/static/").setCachePeriod(0);
    registry.addResourceHandler("/*.png")
            .addResourceLocations("classpath:/static/").setCachePeriod(0);

}

@Bean
public InternalResourceViewResolver defaultViewResolver() {
    return new InternalResourceViewResolver();
}

The resolver is important in this case.

I assume that I made some mistakes when using Spring Boot features and the @EnableWebMvc helped a lot.

Collectives™ on Stack Overflow

Spring serves static content as application/json no matter what

2 Answers 2

3 Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

3 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related