org.aoju.bus.http

Class CacheControl

java.lang.Object

org.aoju.bus.http.CacheControl

public final class CacheControl
extends Object

A Cache-Control header with cache directives from a server or client. These directives set policy on what responses can be stored, and which requests can be satisfied by those stored responses.

See RFC 7234, 5.2.

Since:

JDK 1.8

Version:

3.2.6

Author:

Kimi Liu

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	CacheControl.Builder

Field Summary

Fields

Modifier and Type	Field and Description
static CacheControl	FORCE_CACHE Cache control request directives that uses the cache only, even if the cached response is stale.
static CacheControl	FORCE_NETWORK Cache control request directives that require network validate of responses.

Method Summary

Modifier and Type	Method and Description
boolean	immutable()
boolean	isPrivate()
boolean	isPublic()
int	maxAgeSeconds() The duration past the response's served date that it can be served without validate.
int	maxStaleSeconds()
int	minFreshSeconds()
boolean	mustRevalidate()
boolean	noCache() In a response, this field's name "no-cache" is misleading.
boolean	noStore() If true, this response should not be cached.
boolean	noTransform()
boolean	onlyIfCached() This field's name "only-if-cached" is misleading.
static CacheControl	parse(Headers headers)
int	sMaxAgeSeconds() The "s-maxage" directive is the max age for shared caches.
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

FORCE_NETWORK

public static final CacheControl FORCE_NETWORK

Cache control request directives that require network validate of responses. Note that such requests may be assisted by the cache via conditional GET requests.

FORCE_CACHE

public static final CacheControl FORCE_CACHE

Cache control request directives that uses the cache only, even if the cached response is stale. If the response isn't available in the cache or requires server validate, the call will fail with a 504 Unsatisfiable Request.

Method Detail

parse

public static CacheControl parse(Headers headers)

noCache

public boolean noCache()

In a response, this field's name "no-cache" is misleading. It doesn't prevent us from caching the response; it only means we have to validate the response with the origin server before returning it. We can do this with a conditional GET.

In a request, it means do not use a cache to satisfy the request.

Returns:

the boolean

noStore

public boolean noStore()

If true, this response should not be cached.

Returns:

the boolean

maxAgeSeconds

public int maxAgeSeconds()

The duration past the response's served date that it can be served without validate.

Returns:

the int

sMaxAgeSeconds

public int sMaxAgeSeconds()

The "s-maxage" directive is the max age for shared caches. Not to be confused with "max-age" for non-shared caches, As in Firefox and Chrome, this directive is not honored by this cache.

Returns:

the int

isPrivate

public boolean isPrivate()

isPublic

public boolean isPublic()

mustRevalidate

public boolean mustRevalidate()

maxStaleSeconds

public int maxStaleSeconds()

minFreshSeconds

public int minFreshSeconds()

onlyIfCached

public boolean onlyIfCached()

This field's name "only-if-cached" is misleading. It actually means "do not use the network". It is set by a client who only wants to make a request if it can be fully satisfied by the cache. Cached responses that would require validate (ie. conditional gets) are not permitted if this header is set.

Returns:

the boolean

noTransform

public boolean noTransform()

immutable

public boolean immutable()

toString

public String toString()

Overrides:

toString in class Object