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https://en.wikipedia.org/wiki/Varnish_(software)
Varnish is an HTTP accelerator designed for content-heavy dynamic web sites as well as APIs. In contrast to other web accelerators, such as Squid, which began life as a client-side cache, or Apache and nginx, which are primarily origin servers, Varnish was designed as an HTTP accelerator.Varnish is focused exclusively on HTTP, unlike other proxy servers that often support FTP, SMTP and other ...License: two-clause BSD license
https://varnish-cache.org/docs/trunk/phk/gzip.html
Even if the client does not support gzip, you can force the A-C header to "gzip" to save bandwidth between the backend and varnish, varnish will gunzip the object before delivering to the client. In vcl_miss{} you can remove the "Accept-Encoding: gzip" header, if you do …
https://varnish-cache.org/docs/3.0/tutorial/compression.html
Compression¶. New in Varnish 3.0 was native support for compression, using gzip encoding. Before 3.0, Varnish would never compress objects.. In Varnish 3.0 compression defaults to "on", meaning that it tries to be smart and do the sensible thing.
https://stackoverflow.com/questions/10039321/gzip-compression-using-varnish-cache
Varnish Cache 3.0 does most of the handling of Accept-Encoding automatically and you shouldn't mess with it. Basically, if you want Varnish to compress an object just set beresp.do_gzip in vcl_fetch and it will compress it before storing it in cache. Uncompression happens automatically when needed.
https://info.varnish-software.com/blog/varnish-cache-brotli-compression
This allowed Varnish Cache to store multiple encodings for each request and deliver the matching encoding to the client. When Varnish Cache released native gzip encoding support in 3.0, this changed. The first change was that Varnish Cache will always request gzip encoding from the backend.
https://www.varnish-software.com/wiki/start/your_varnish_goals.html
The http_gzip_support = on And beresp.do_gzip and beresp.do_gunzip are NOT used in VCL. Unless while returning from vcl_recv with pipe or pass, Varnish modifies req-http-Encoding that is say, the req.http.Accept-Encoding is set to “gzip” that means this client supports compressed content.
https://support.hypernode.com/knowledgebase/varnish-on-magento2/
Customers with Hypernode Professional and Excellence plans can use Varnish to boost their Magento shop. This article explains how you can configure Varnish for your Hypernode. Do you have a Magento 1 shop, please check this article. Although Varnish is extremely awesome when it get’s to speeding up websites, Varnish is a complex technique that […]
http://book.varnish-software.com/4.0/chapters/Design_Principles.html
HTTP specifies that multiple objects can be served from the same URL depending on the preferences of the client. For instance, content in gzip format is sent only to clients that indicate gzip support. Varnish stores a single compressed object under one hash key.
https://docs.varnish-software.com/varnish-administration-console/varnish-agent/api/
If a client does not support gzip encoding Varnish will uncompress compressed objects on demand. Varnish will also rewrite the Accept-Encoding header of clients indicating support for gzip to: Accept-Encoding: gzip Clients that do not support gzip will have their Accept-Encoding header removed.
http://book.varnish-software.com/4.0/chapters/Saving_a_Request.html
The main goal of grace mode is to avoid requests to pile up whenever a popular object has expired in cache. To understand better grace mode, recall Fig. 2 which shows the lifetime of cached objects. When possible, Varnish delivers a fresh object, otherwise Varnish builds a response from a stale object and triggers an asynchronous refresh request.
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