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Assume that 120 seconds have passed since the initial fetch and the browser has initiated a new request for the same resource.

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The court left open the possibility that states can pass specific, “narrower” laws designed to protect people entering and leaving abortion clinics, or to ensure the safety of the crowd or others. the government may impose reasonable re­strictions on the time, place, or manner of protected speech, provided the restrictions ‘are justified without reference to the content of the regulated speech, that they are narrowly tailored to serve a signifi­cant governmental interest, and that they leave open ample alterna­tive channels for communication of the information,’” the court held.

For example, states can pass laws allowing police offers to force protesters to create an aisle through which a patient or doctor can pass. This is the most significant decision related to abortion politics since 2007, when the court upheld a ban on some late-term abortions.

The decision also left open the possibility that a state could pass a law entirely banning protests at abortion clinics—but only if it demonstrated that narrower measures had not worked, and that patients and employees were being illegally prevented from accessing a legal establishment.

Fetching something over the network is both slow and expensive.

When the server returns a response, it also emits a collection of HTTP headers, describing its content-type, length, caching directives, validation token, and more.

For example, in the above exchange, the server returns a 1024-byte response, instructs the client to cache it for up to 120 seconds, and provides a validation token ("x234dff") that can be used after the response has expired to check if the resource has been modified.

The server generates and returns an arbitrary token, which is typically a hash or some other fingerprint of the contents of the file.

The client doesn't need to know how the fingerprint is generated; it only needs to send it to the server on the next request.

The server checks the token against the current resource.

If the token hasn't changed, the server returns a "304 Not Modified" response, which tells the browser that the response it has in cache hasn't changed and can be renewed for another 120 seconds.

The only thing left to do is to ensure that the server is providing the necessary ETag tokens.

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