Hi Harsha, This is part of the specification. You can see the "Age header"
https://tools.ietf.org/html/rfc2616#page-124 thanks, Dimuthu On Wed, Jan 24, 2018 at 9:19 PM, Harsha Kumara <hars...@wso2.com> wrote: > > > On Wed, Jan 24, 2018 at 3:34 PM, Keerthika Mahendralingam < > keerth...@wso2.com> wrote: > >> Hi All, >> >> I need to get the cached response fetched time from origin server which >> is returned in the BE response with Date header. When I debugged the >> cache-mediator code, I found that when caching the response Date header is >> added to the cache. But when I retrieve the cached response for the >> subsequent request, Date header is removed from the cached response. >> >> This is due to we are removing the Date header from the response [1] and >> send a new Date header with the response to the user. If we set the >> preserveHeaders(in passthru-http.properties), I was able to get the Date >> header from the cached response as well. >> >> So, as I need the response fetched time to calculate the TTL value of the >> cached response, I am planning to add a property to the cached response to >> store the fetched time and use it to calculate the TTL. Or do we need to >> suggest the user to set the preserve header? >> > I think adding a property is better rather adding header to the response. > >> >> >> [1]. https://github.com/wso2/wso2-synapse/blob/master/module >> s/transports/core/nhttp/src/main/java/org/apache/synapse/ >> transport/passthru/util/PassThroughTransportUtils.java#L160 >> >> Thanks, >> Keerthika. >> >> On Tue, Jan 23, 2018 at 8:26 PM, Keerthika Mahendralingam < >> keerth...@wso2.com> wrote: >> >>> Hi All, >>> >>> I am trying to add an Age header when returning the cached response(as >>> discussed in [1]). I am following the steps as follows: >>> >>> - If the response doesn't have the Date header, add Date header >>> (with current time) when caching the response[2]. >>> - For the subsequent request, get the Date header value of the >>> cached response, timeout and current requested time and find the TTL >>> value >>> as: >>> >>> TTL = difference ((DateHeaderValue + timeout), CurrentTime) >>> >>> >>> - Set the TTL value as Age header. >>> >>> Please let me know if you have any concerns on this. >>> >>> [1]. [Architecture][RRT] Improving caching based on cache-control and >>> ETag headers >>> [2]. https://tools.ietf.org/html/rfc2616#page-124 >>> >>> Thanks, >>> Keerthika. >>> -- >>> <dev-requ...@wso2.org> >>> Keerthika Mahendralingam >>> Software Engineer >>> Mobile :+94 (0) 776 121144 <+94%2077%20612%201144> >>> keerth...@wso2.com >>> WSO2, Inc. >>> lean . enterprise . middleware >>> >> >> >> >> -- >> <dev-requ...@wso2.org> >> Keerthika Mahendralingam >> Software Engineer >> Mobile :+94 (0) 776 121144 <+94%2077%20612%201144> >> keerth...@wso2.com >> WSO2, Inc. >> lean . enterprise . middleware >> > > > > -- > Harsha Kumara > Software Engineer, WSO2 Inc. > Mobile: +94775505618 <077%20550%205618> > Blog:harshcreationz.blogspot.com > -- Dimuthu Leelarathne Director, Solutions Architecture WSO2, Inc. (http://wso2.com) email: dimut...@wso2.com Mobile: +94773661935 Blog: http://muthulee.blogspot.com Lean . Enterprise . Middleware
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