Vary header in the attachment

Aug 6th, 2022
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How to vary header in the attachment

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MALE SPEAKER: Todays question comes from Christian in Madrid, who asks, Whats Googles position about continuing to recommend the HTTP Vary User-Agent header for specific mobile websites after big players like Akamai said they dont cache the URLs that include it? Would you still recommend using it? OK, this is a pretty detailed topic, and its pretty esoteric, so lets see if we can unpack it and try to explain whats going on there. So first off, whats caching? Well, if you ask for a web page, and then you ask for the exact same web page three seconds later, why do all the work to re-compute what that web page might look like if youre doing a dynamic URL when you could save that content and just return the same content back to users? Now, you might need to re-compute that data once an hour or once a day or something like that, but once youve done the work to compute what a web page should look like, oftentimes, you can cache it. And so in the case when youre hitting a web ser

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The HTTP User-Agent header is intended to clearly identify the agent to the server. However, this header can be omitted or spoofed, so some websites use other detection methods.
Type Remove in the Search available behaviors field to filter the behaviors listed. Select the Remove Vary Header behavior, and click the Insert Behavior button. Set the Remove Vary Header slider to Off.
The Vary header tells any HTTP cache which parts of the request header, other than the path and the Host header, to take into account when trying to find the right object. It does this by listing the names of the relevant headers, which in this case is Accept-Encoding .
What Does Specify a Vary: Accept-Encoding Header Actually Mean? Accept-encoding header is an HTTP header which must be included on every origin server response. Its main job is to inform the browsers if the client can handle the compressed version of the website.
The HTTP headers are used to pass additional information between the clients and the server through the request and response header. All the headers are case-insensitive, headers fields are separated by colon, key-value pairs in clear-text string format.
A Vary Response Header fulfils, ing to its design, the following functions: It gives Cache-Servers of providers the indication that, whilst requesting the Cache, the User-Agent also has to be considered. It helps Web Crawlers quickly identify and index mobile optimized content.
What is the function of HTTP Vary Header? HTTP Vary header is the primary mechanism for returning an HTTP response of the server to notify intermediate caches (like proxy servers) that the website content varies depending on the specifications of the requesting web client.

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