Firstly, the Client provides the Server with a set of entity tags (E-tags). Generally, it is used to update the entity tags on the server. It is used to make the request conditional. It is a response-type header used as an identifier for a specific version of a resource. This is the formal definition of Last-Modified of HTTP headers The last modified response header is a header sent by the server specifying the date of the last modification of the requested source. This header is used indicates the desired resource width in physical pixels. It is used to indicates the layout viewport width in CSS pixels. It is used to reduce the usage of the data on the client side. This header is used indicate that the request has been conveyed in early data. It is used to specify the approximate ram left on the client device. It is response-type header, It is used to defines the ratio of the physical pixels over the CSS pixels of the current window of the device. It is used to define the ratio between physical pixels over CSS pixels of the selected image response. It is a response-type header used to specify persistence of Accept-CH header value. ![]() ![]() It specify which Client Hints headers client should include in subsequent requests. It is a general type header that is used to inform possible problems to the client. It is general-type header, but response behavior is not specified and thus implementation-specific. It is a response-type header, it is used to define date/time after after that time that will be vanished. This header is used in deleting the browsing data which is in the requesting website. It is a general type header used to specify directives for caching mechanisms. It defines the times in seconds of the object that have been in the proxy cache. It should be used to gain access to a resource. It is a response header that defines the authentication method. This header contains the credentials to authenticate between the user agent and the user-specified server. It allows the proxy server to transmit the request further by authenticating it. It is a response header gives access to a resource file by defining an authorization method. It is used to request restricted documents. Headers can also be categorized according to how proxies handle them:
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