koa-cache-control

A simple method for managing cache control headers from your application. It also tries to provide a simple set of rules for common use cases such as setting 'max-age=0' when 'no-cache' is present by default.

Example

Configuring noCache easily:

app.use(cacheControl({
    noCache: true
}));

Creates a cache-control header of no-cache, max-age=0

Usage

To start using cacheControl, just use the middleware in your application:

app.use(cacheControl());

Default Cache Headers

When initialising the middleware you can set default options when you use it in your application:

app.use(cacheControl({
    maxAge: 5
}));

Overriding Defaults

Just set the cacheControl object after the cacheControl() middleware is loaded on the request context:

app.use(function (ctx, next) {
    ctx.cacheControl = {
        maxAge: 60
    };

    return next();
});

This is useful in error conditions where you can setup cache headers before and after a request is processed:

app.use(function (ctx, next) {
    ctx.cacheControl = {
        maxAge: 60
    };

    return next().catch((err) => {
      ctx.cacheControl = {
          maxAge: 5
      };
    });
});

Options

Name	Value	Description
private	Boolean	Adds 'private' flag, overrides 'public' option
public	Boolean	Adds 'public' flag
noStore	Boolean	Adds 'no-store' flag and includes noCache
noCache	Boolean	Adds 'no-cache' flag, sets maxAge to 0 and removes sMaxAge, staleIfError and staleWhileRevalidate
noTransform	Boolean	Adds 'no-transform' flag
mustRevalidate	Boolean	Adds 'must-revalidate' flag and removes staleIfError and staleWhileRevalidate
staleIfError	Number	Adds 'stale-if-error=%d' flag
staleWhileRevalidate	Number	Adds 'stale-while-revalidate=%d' flag
maxAge	Number	Adds 'max-age=%d' flag
sMaxAge	Number	Adds 's-maxage=%d' flag