janhoy commented on code in PR #2885:
URL: https://github.com/apache/solr/pull/2885#discussion_r1860578922
##########
solr/core/src/java/org/apache/solr/cli/ExportTool.java:
##########
@@ -660,8 +660,8 @@ class CoreHandler {
}
boolean exportDocsFromCore() throws IOException, SolrServerException {
-
- try (SolrClient client = CLIUtils.getSolrClient(baseurl, credentials))
{
+ // reference the replica's node URL, not the baseUrl in scope, which
could be anywhere
+ try (SolrClient client = CLIUtils.getSolrClient(replica.getBaseUrl(),
credentials)) {
Review Comment:
Since this is a CLI tool, and the CLI tool is potentially being used from a
computer outside the cluster itself, I wonder if a side-effect of this might be
that it won't work through reverse proxy / ingress with a different external
DNS name than what Solr has on the inside.
If I interpret this code correctly, `replica.getBaseUrl()` is data fetched
from ZK clusterstate, while `baseUrl` was the user-supplied `--solr-url`. Thus
it could be that export tool would currently work through a proxy / ingress due
to the auto proxying, but may not work with this change.
A related and similar issue is that the Admin UI does not work well behind a
reverse proxy, if you try to click on links for other Cores it will all break.
If we truly want to support clients through reverse proxies, I believe the
correct fix is for the Solr server to support [Forwarded HTTP
header](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Forwarded)
(and its `X-Forwarded-*` counterparts) and rewrite URLs served in REST
responses to adhere to the external address space, not the internal.
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