What do you mean by an E-Tag and how does it work?

• The HTTP protocol used by the World Wide Web includes the ETag, or entity tag. It is one of the Web cache validation mechanisms that HTTP offers, enabling a client to issue conditional requests.The word "ETag" refers to an ambiguous identifier that is typically assigned by the web server. It is generally utilised with the same version of the URL-provided resources. ETag is a crucial component of HTTP and is in charge of analysing client requests to determine whether to deliver the file (HTTP 200) or provide the client with a local copy of the information (HTTP 304).

In order to confirm that the client (such as a mobile device) has the most recent version of a record, an HTTP header called an ETag (entity tag) is utilised. The ETag is returned as a response header in response to a GET request. The client can also submit conditional requests thanks to the ETag.OSLC allows conditional updates in addition to the fundamental update methods of HTTP PUT and HTTP PATCH. Conditional updates check that clients have the most recent entity for a resource using HTTP entity tags and If-Match headers. Race situations and problematic updates are found using this method.