```
public abstract class ResponseCache
extends Object
```
Represents implementations of URLConnection caches. An instance of such a class can be registered with the system by doing ResponseCache.setDefault(ResponseCache), and the system will call this object in order to:
- store resource data which has been retrieved from an external source into the cache
- try to fetch a requested resource that may have been stored in the cache
The ResponseCache implementation decides which resources should be cached, and for how long they should be cached. If a request resource cannot be retrieved from the cache, then the protocol handlers will fetch the resource from its original location. The settings for URLConnection#useCaches controls whether the protocol is allowed to use a cached response. For more information on HTTP caching, see RFC 2616: Hypertext Transfer Protocol -- HTTP/1.1
Since:

1.5

Constructor Summary

Constructors
Constructor and Description

ResponseCache()

ResponseCache (Java Platform SE 7 ) Home of API Java Contents Haut

Method Summary

Methods
Modifier and Type	Method and Description
`abstract CacheResponse`	`get(URI uri, String rqstMethod, Map<String,List<String>> rqstHeaders)` Retrieve the cached response based on the requesting uri, request method and request headers.
`static ResponseCache`	`getDefault()` Gets the system-wide response cache.
`abstract CacheRequest`	`put(URI uri, URLConnection conn)` The protocol handler calls this method after a resource has been retrieved, and the ResponseCache must decide whether or not to store the resource in its cache.
`static void`	`setDefault(ResponseCache responseCache)` Sets (or unsets) the system-wide cache.

ResponseCache (Java Platform SE 7 ) Home of API Java Contents Haut

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - ResponseCache
```
public ResponseCache()
```
- Method Detail
  - getDefault
```
public static ResponseCache getDefault()
```
    Gets the system-wide response cache.
    
    Returns:
    the system-wide ResponseCache
    
    Throws:
    
    SecurityException - If a security manager has been installed and it denies NetPermission("getResponseCache")
    Since:
    
    1.5
    
    See Also:
    setDefault(ResponseCache)
  - setDefault
```
public static void setDefault(ResponseCache responseCache)
```
    Sets (or unsets) the system-wide cache. Note: non-standard procotol handlers may ignore this setting.
    
    Parameters:
    responseCache - The response cache, or null to unset the cache.
    
    Throws:
    
    SecurityException - If a security manager has been installed and it denies NetPermission("setResponseCache")
    Since:
    
    1.5
    
    See Also:
    getDefault()
  - get
```
public abstract CacheResponse get(URI uri,
                String rqstMethod,
                Map<String,List<String>> rqstHeaders)
                           throws IOException
```
    Retrieve the cached response based on the requesting uri, request method and request headers. Typically this method is called by the protocol handler before it sends out the request to get the network resource. If a cached response is returned, that resource is used instead.
    
    Parameters:
    uri - a URI used to reference the requested network resource
    rqstMethod - a String representing the request method
    rqstHeaders - - a Map from request header field names to lists of field values representing the current request headers
    
    Returns:
    a CacheResponse instance if available from cache, or null otherwise
    
    Throws:
    
    IOException - if an I/O error occurs
    
    IllegalArgumentException - if any one of the arguments is null
    See Also:
    URLConnection.setUseCaches(boolean), URLConnection.getUseCaches(), URLConnection.setDefaultUseCaches(boolean), URLConnection.getDefaultUseCaches()
  - put
```
public abstract CacheRequest put(URI uri,
               URLConnection conn)
                          throws IOException
```
    The protocol handler calls this method after a resource has been retrieved, and the ResponseCache must decide whether or not to store the resource in its cache. If the resource is to be cached, then put() must return a CacheRequest object which contains an OutputStream that the protocol handler will use to write the resource into the cache. If the resource is not to be cached, then put must return null.
    
    Parameters:
    uri - a URI used to reference the requested network resource
    conn - - a URLConnection instance that is used to fetch the response to be cached
    
    Returns:
    a CacheRequest for recording the response to be cached. Null return indicates that the caller does not intend to cache the response.
    
    Throws:
    
    IOException - if an I/O error occurs
    
    IllegalArgumentException - if any one of the arguments is null

Document created the 11/06/2005, last modified the 04/03/2020
Source of the printed document:https://www.gaudry.be/en/java-api-rf-java/net/responsecache.html/.html/

The infobrol is a personal site whose content is my sole responsibility. The text is available under CreativeCommons license (BY-NC-SA). More info on the terms of use and the author.

References

Manuel PHP : https://docs.oracle.com

These references and links indicate documents consulted during the writing of this page, or which may provide additional information, but the authors of these sources can not be held responsible for the content of this page.
The author This site is solely responsible for the way in which the various concepts, and the freedoms that are taken with the reference works, are presented here. Remember that you must cross multiple source information to reduce the risk of errors.

Contents Haut

Class ResponseCache

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

ResponseCache

Method Detail

getDefault

setDefault

get

put

References