HTTP headers | Age Last Updated : 31 Oct, 2019 Summarize Comments Improve Suggest changes Share Like Article Like Report The HTTP header Age defines the times in seconds of the object that have been in the proxy cache. Usually, the age header is close to zero. It is just summoned from the server, used to calculate the proxies' current date and the date. It is a response header. Syntax: age: <delta-seconds> Directives: This header accepts single directive as mentioned above and described below: <delta-seconds>: This directive defines a non-negative integer of the time in second unit of the object that has been in a proxy cache. Time can not be negative. Example: age: 128404 age: 1859070 To check the age in action go to Inspect Element -> Network check the request header for age like below, age is highlighted. Supported Browsers: The browsers compatible with HTTP header Age are listed below: Google Chrome Internet Explorer Firefox Safari Opera Comment More infoAdvertise with us Next Article HTTP headers | Age S Sabya_Samadder Follow Improve Article Tags : Computer Networks HTTP-headers Similar Reads HTTP headers | Date Description: HTTP headers are used to pass additional information with HTTP response or HTTP request. Date HTTP header contains the date and time at which the message was generated. It is supported by all the browsers. Syntax: Date: day-name, day month year hour:minute:second GMT Directives: day-nam 2 min read HTTP headers | ETag ETag or Entity Tag is a response-type header that works as a validator to let client make conditional requests. It makes re-validation requests more efficient by triggering request headers which help with web cache validation that makes economical use of network bandwidth. ETag is generated as ident 3 min read HTTP headers | Digest The Digest HTTP header is a response HTTP header that provides the requested resource with a small value generated by a hash function from a whole message. The Digest HTTP header is a response header that provides a digest of the requested resource. The entire representation is used to calculate the 1 min read HTTP Headers - User-Agent The HTTP header User-Agent is a request header that sends a characteristic string to web servers, allowing them to identify the Operating System (OS) and browser of the client making the request.Every time your browser connects to a website, it includes the User-Agent field in the HTTP header. This 2 min read HTTP headers | expires The HTTP Expires header is a response-type header, the fundamental way of controlling the caches present. The expire header contains the date and time which denotes the period where the object can stay alive. Once the period expires, the object becomes stale. Almost every client support expire heade 2 min read Like