Different browsers send different headers for refreshing behaviors, but different refresh behaviors.

Different browsers send different headers for refreshing behaviors, but different refresh behaviors.

3. Local browser -- Proxy Server (squid) -- remote server (RS)

In this data stream, let's think about how it works. The local Browser needs to obtain the data on a url and then send the HTTP request to squid, squid converts the HTTP request into its own request and sends it to RS. Then squid gets the data and returns the data to the local browser. Therefore, we need to clarify the following important concepts:

1. for RS, the access to RS is squid, which is not directly associated with the local browser.

2. for squid, if the HTTP request returns 304, squid will obtain the cached data from itself. If the HTTP request returns 200, squid will obtain new data from RS.

3. for a local browser, if HTTP returns 304, the data I obtain is the data cached by squid. If the result is 200, it indicates that the data is the new data obtained by squid from RS, and then passed to me, which is equivalent to a new data.

If you understand the above behaviors, you can check the following 4th questions:

4. browser refresh

The header information sent by refreshing behaviors of different browsers is different. Assume that the last time the server returns Last_Modified and

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