URL beginning

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it’s A 13 letters crossword definition.
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Possible Answers:

HTTP.

Last seen on: USA Today Crossword – Jun 22 2022

Random information on the term “HTTP”:

HTTP persistent connection, also called HTTP keep-alive, or HTTP connection reuse, is the idea of using a single TCP connection to send and receive multiple HTTP requests/responses, as opposed to opening a new connection for every single request/response pair. The newer HTTP/2 protocol uses the same idea and takes it further to allow multiple concurrent requests/responses to be multiplexed over a single connection.

Under HTTP 1.0, connections should always be closed by the server after sending the response.

Since late 1996, developers of popular products (browsers, web servers, etc.) using HTTP/1.0, started to add an unofficial extension (to the protocol) named “keep-alive” in order to allow the reuse of a connection for multiple requests/responses.

If the client supports keep-alive, it adds an additional header to the request:

When the server receives this request and generates a response, if it supports keep-alive then it also adds the same above header to the response. Following this, the connection is not dropped, but is instead kept open. When the client sends another request, it uses the same connection.

HTTP on Wikipedia