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java - volley中的entry.softTtl和entry.ttl有什么区别?

在HttpHeaderParser类中:publicstaticCache.EntryparseCacheHeaders(NetworkResponseresponse){longnow=System.currentTimeMillis();Mapheaders=response.headers;longserverDate=0;longserverExpires=0;longsoftExpire=0;longmaxAge=0;booleanhasCacheControl=false;StringserverEtag=null;StringheaderValue;headerValue