Grails 3.2.4: Http header "Cache-Control:no-store" on static resources causes slow response and high http traffic

[atasc]

Task List

• Steps to reproduce provided
• Stacktrace (if present) provided
• Example that reproduces the problem uploaded to Github
• Full description of the issue provided (see below)

Full description

All static resources located in src/main/webapp are served with Http header "Cache-Control:no-store",
this causes a slow response and a high http traffic as the browser does not use cache and downloads these resources every time.
I've tried to set the header (response.setHeader('Cache-Control', 'max-age=600')) using an Interceptor or a Filter with no luck,
it is set to 'no-store' later in the response chain.

Is it possible to change this behaviour?

Steps to Reproduce

1. create an empty 3.2.4 app
2. add some static resource to src/main/webapp for example src/main/webapp/css/style.css
3. run-app
4. Open http://localhost:8080/static/css/style.css
5. Check the Http response header

Expected Behaviour

Actual Behaviour

All static resources are served with Http header "Cache-Control:no-store"

Environment Information

• **Operating System: Linux 64 bit
• **Grails Version: 3.2.4
• **JDK Version: 1.8.0_111
• **Container Version: Tomcat 8

Example Application

myapp.zip

[graemerocher]

You can configure grails.resources.cachePeriod and set it to whatever you want in application.yml

[pangeaos]

Is there any documentation? It's hard to find it.
grails: resources: cachePeriod: 120
It's not working for me.

[abobwhite]

This solution DOES work but how can we avoid this on certain file types? I have an SPA with an index.html that I absolutely do not want cached but I want everything else cached until eternity because new builds have new file names for everything but index.html

[ginchauspe]

On 3.3.9 add grails.resources.cachePeriod=number in your application.groovy

[erichelgeson]

I was a bit curious about this so dug in a bit - as a work around you can add your own no-cache ResourceHandler for index.html and then have the static resources use the cachePeriod - Though I think it'd be worth while to add this in as an option in grails as SPA's being used more often.

@Configuration
class SpaResolverConfig implements WebMvcConfigurer {
    private static final String[] CLASSPATH_RESOURCE_LOCATIONS = ["classpath:/public/"]
    
    @Override
    void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler('/static/index.htm*') // needs to be an antmatcher
                .addResourceLocations(CLASSPATH_RESOURCE_LOCATIONS)
                .setCachePeriod(0)
    }
}