org.apache.juneau.http.Age Maven / Gradle / Ivy
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package org.apache.juneau.http;
import org.apache.juneau.http.annotation.*;
/**
* Represents a parsed Age HTTP response header.
*
*
* The age the object has been in a proxy cache in seconds.
*
*
Example
*
* Age: 12
*
*
* RFC2616 Specification
*
* The Age response-header field conveys the sender's estimate of the amount of time since the response (or its
* revalidation) was generated at the origin server.
* A cached response is "fresh" if its age does not exceed its freshness lifetime.
* Age values are calculated as specified in section 13.2.3.
*
*
* Age = "Age" ":" age-value
* age-value = delta-seconds
*
*
*
* Age values are non-negative decimal integers, representing time in seconds.
*
*
* If a cache receives a value larger than the largest positive integer it can represent, or if any of its age
* calculations overflows, it MUST transmit an Age header with a value of 2147483648 (2^31).
*
*
* An HTTP/1.1 server that includes a cache MUST include an Age header field in every response generated from its own
* cache.
*
*
* Caches SHOULD use an arithmetic type of at least 31 bits of range.
*
*
See Also:
*
* - {@doc RFC2616}
*
*/
@Header("Age")
public final class Age extends HeaderInteger {
/**
* Constructor.
*
* @param value
*/
public Age(Integer value) {
super(value);
}
/**
* Returns a parsed Age header.
*
* @param value The Age header string.
* @return The parsed Age header, or null if the string was null.
*/
public static Age forString(String value) {
if (value == null)
return null;
return new Age(value);
}
private Age(String value) {
super(value);
}
}