[react-instantsearch-nextjs] - NextJS App Router double server side calls

[wesleyjanse]

We are seeing that there are 2 exactly the same api calls are happening on SSR.

We see this in Vercel and we also see this in Algolia Realtime Monitoring.

Example of a double request happening at the exact same time:

Request 1:
{
  "requests": [
    {
      "indexName": "xxxxxxx",
      "params": "analytics=true&clickAnalytics=true&facets=%5B%22*%22%5D&filters=allCategories%3A2444&highlightPostTag=__%2Fais-highlight__&highlightPreTag=__ais-highlight__&hitsPerPage=20&maxValuesPerFacet=20&page=0&query=&userToken=anonymous"
    }
  ]
}
 
Request 2:
{
  "requests": [
    {
      "indexName": "xxxxxxx",
      "params": "analytics=true&clickAnalytics=true&facets=%5B%22*%22%5D&filters=allCategories%3A2444&highlightPostTag=__%2Fais-highlight__&highlightPreTag=__ais-highlight__&hitsPerPage=20&maxValuesPerFacet=20&page=0&query=&userToken=anonymous"
    }
  ]
}

Versions:

    "react-instantsearch": "7.13",
    "react-instantsearch-nextjs": "0.3",

We have a very normal hook based implementation, 1 virtual search-box, and we use initial filters for our PLPs.

What is the cause that on server level 2 api calls are executed? We don't have additional client side calls when SSR'ing the page. So that is not the issue.

Or if anyone knows a better way to debug this locally please let me know.

[Haroenv]

Indeed, we were just made knowledge of this and I've been working on a solution. For now a workaround is manually enabling a cache that you clear on every page load (to prevent memory pressure or leaks).

The implementation for app router can be seen here: https://github.com/algolia/instantsearch/pull/6456/files#diff-22a1bfe50b37796a54cfc70812b508ee6c4938bf92ecdb3a3b36dedfa1541237

note that this PR also includes a fix that ensures the user token is always consistent, so you may want to cherry-pick that fix in your site already

Hope that helps!

[wesleyjanse]

Do you have an idea when this change will be merged?

[Haroenv]

likely on 8 December, we have code freeze until then