1

The default VCL produced by Magento from the admin has the following few lines in it:

# Bypass shopping cart, checkout and search requests
if (req.url ~ "/checkout" || req.url ~ "/catalogsearch") {
    return (pass);
}

Now I understand why Magento would want requests to bypass Varnish for checkout URLs, but why search requests? Is it purely because search results can change frequently?

5

Yes, because search results change frequently and Magento doesn't know how to invalidate those results. And because the world isn't a perfect place to live :(

Anyway, you can do just:

# Bypass shopping cart, checkout
if (req.url ~ "/checkout") {
    return (pass);
}  

(note removed catalogsearch from condition)

And do some "microcaching" of popular search results by still having Varnish cache search results, simply with reasonable TTL. In vcl_backend_response:

# "Microcache" for search
if (bereq.url ~ "/catalogsearch") {
    set beresp.ttl = 30m;
} 

See always up-to-date full VCL for Magento 2 which includes this.

1
  • That's a great suggestion for a micro-cache, thanks! – Danny Nimmo Feb 28 '17 at 5:41
0

Yes, one of the biggest problems with running varnish on a Magento 1.x site was the fact that the cart page would be auto-magically cached. So if I was the first person to add something to my cart, the next person who added something (different) to their cart would see what I added. (Unless you specifically told varnish via the VCL to bypass the cart and checkout pages.)

Same thing can happen on a catalog search page result - the filterable navigation on the left hand side of a normal search results page can easily be cached.

Using a default Luma theme on Magento 2.1, here's a sample URL: http://domain.com/catalogsearch/result/?q=yoga

Here's a screenshot of the results: Magento 2 - search results page

On a page like this, you have the left navigation that can open or close, sort by (relevance, price), or the grid view vs. list view, items per page.

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