fix: return empty noindex webpage when crawlers hit specific pages #8744
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alexgarel
approved these changes
Jul 27, 2023
when a crawler hit nested facets (ex: /category/popcorn-with-caramel/data-quality-error/nutrition-value-total-over-105) we return a blank HTML page with a noindex directive to prevent the crawler from overloading our servers.
The User-Agent has changed: see https://bot.seekport.com/
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Codecov Report
@@ Coverage Diff @@
## main #8744 +/- ##
==========================================
- Coverage 48.78% 48.73% -0.06%
==========================================
Files 117 117
Lines 21882 21908 +26
Branches 4869 4872 +3
==========================================
+ Hits 10676 10677 +1
- Misses 9903 9927 +24
- Partials 1303 1304 +1
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Crawling bots can't visit all page and crawl OFF continuously. We want to limit crawlers on interesting pages, so we return a noindex html page on most facet pages (except most interesting ones such as brand, category,...)
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This was referenced Jul 28, 2023
| @@ -564,6 +569,24 @@ sub analyze_request ($request_ref) { | |||
| $request_ref->{text} = 'index-pro'; | |||
| } | |||
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| # Return noindex empty HTML page for web crawlers that crawl specific facet pages | |||
| if (($request_ref->{is_crawl_bot} eq 1) and (defined $request_ref->{tagtype})) { | |||
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the "eq" operator converts both values to a string before comparing, it's best to use == for numbers
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An analysis of nginx logs made us realize that 6% of our traffic was due to Bing bot, half of the queries were "facet" queries that involve aggregate MongoDB queries and consume a lot of resources.
See https://openfoodfacts.slack.com/archives/C1FPYCWM7/p1690454042958259 discussion for more context.
As a result, we decided to prevent known crawlers from crawling nested facet pages (2 facets). This should limit drastically the number of crawlable pages and reduce server load (especially the DB server).
I checked locally with custom User Agent, nested facet pages are blocked as expected.