Common Opensolr Connection Issues in Drupal
This guide covers the most common connection issues when setting up Drupal with Opensolr, including path configuration, the 404 misconception, and Solr version compatibility.
Path vs SolrCore in Drupal
Drupal's Search API Solr module splits the Solr connection URL into two parts: Path and SolrCore. This can be confusing because Opensolr shows the full URL as one piece.
The 404 Misconception
A very common confusion: you paste your Opensolr connection URL into a browser and get 404 NOT FOUND. You think something is broken — but actually, this is normal.
The base URL (e.g., https://server.solrcluster.com/solr/your_index/) does not have a handler at the root. Your application appends request handlers like /select, /update, /admin/luke to this base URL.
For example:
# This returns 404 (normal!): https://server.solrcluster.com/solr/your_index/ # This works perfectly: https://server.solrcluster.com/solr/your_index/select?q=*:*&wt=json
If /select returns results, your connection is working correctly. The 404 on the base URL is expected behavior.
SolrCloud Mode
If you are using Opensolr in SolrCloud mode, the path changes from /solr to /solrcloud:
| Mode | Path in Drupal | Full URL Pattern |
|---|---|---|
| Standard Solr | / |
host/solr/core_name/select |
| SolrCloud | /solrcloud |
host/solrcloud/core_name/select |
In Drupal, set the Path to /solrcloud instead of / when using SolrCloud.
Solr Version Compatibility
If your Drupal module says it needs Solr 9.x but Opensolr runs Solr 8.x (or vice versa), do not worry. Minor version differences are easily handled. We can adapt your config files to work on any Solr version without impacting functionality.
Contact Opensolr Support and we will adjust your config files for free, instantly during office hours.
Video Tutorial
Watch this walkthrough covering common Drupal-Opensolr connection issues:
Quick Checklist
- Set Path =
/(just a forward slash) in Drupal Solr settings - Set SolrCore = your Opensolr Index name
- A 404 on the base URL is normal — test with
/select?q=*:*instead - For SolrCloud mode, set Path =
/solrcloud - Minor Solr version mismatches are fixable — contact support
Having connection issues? Reach out to us at support@opensolr.com — we will adjust your config files and fix the connection for free.