diff --git a/changelog/unreleased/PR#4870-httpSolrCallGetQueryParams.yml b/changelog/unreleased/PR#4870-httpSolrCallGetQueryParams.yml
new file mode 100644
index 00000000000..d4f29e24bf0
--- /dev/null
+++ b/changelog/unreleased/PR#4870-httpSolrCallGetQueryParams.yml
@@ -0,0 +1,10 @@
+title: >
+  Distributed tracing and audit logging now see request parameters sent in a url-encoded POST body,
+  not only those in the URL query string.
+type: changed
+authors:
+  - name: David Smiley
+  - name: Xinyao Zhang
+links:
+  - name: PR#4870
+    url: https://github.com/apache/solr/pull/4870
diff --git a/solr/core/src/java/org/apache/solr/servlet/HttpSolrCall.java b/solr/core/src/java/org/apache/solr/servlet/HttpSolrCall.java
index 3d80367921f..cec6cf3346b 100644
--- a/solr/core/src/java/org/apache/solr/servlet/HttpSolrCall.java
+++ b/solr/core/src/java/org/apache/solr/servlet/HttpSolrCall.java
@@ -201,8 +201,12 @@ public SolrCore getCore() {
     return core;
   }
 
+  /**
+   * If the request has been created, return its parameters (merges URL and body if applicable);
+   * otherwise, return only the URL query parameters.
+   */
   public SolrParams getQueryParams() {
-    return queryParams;
+    return solrReq != null ? solrReq.getParams() : queryParams;
   }
 
   /** The collection(s) referenced in this request. Populated in {@link #init()}. Not null. */