koa 设置cache_koa-cache-control
Middleware for meddling with Cache-Control headers
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
Repository