[Backport 9.2] Use path_prefix to compute base_url in httpx

elastic_transport/_node/_http_httpx.py

@@ -106,7 +106,7 @@ def __init__(self, config: NodeConfig):
                     ssl_context.load_cert_chain(config.client_cert)
 
         self.client = httpx.AsyncClient(
-            base_url=f"{config.scheme}://{config.host}:{config.port}",
+            base_url=f"{config.scheme}://{config.host}:{config.port}{config.path_prefix}",
             limits=httpx.Limits(max_connections=config.connections_per_node),
             verify=ssl_context or False,
             timeout=config.request_timeout,

tests/node/test_http_httpx.py

@@ -81,6 +81,18 @@ def test_ca_certs_with_verify_ssl_false_raises_error(self):
                 str(exc.value) == "You cannot use 'ca_certs' when 'verify_certs=False'"
             )
 
+    def test_path_prefix(self):
+        node = create_node(
+            NodeConfig(
+                "http",
+                "localhost",
+                9200,
+                path_prefix="/test",
+            )
+        )
+        assert node.base_url == "http://localhost:9200/test"
+        assert node.client.base_url == "http://localhost:9200/test/"
+
 
 @pytest.mark.anyio
 class TestHttpxAsyncNode:

tests/node/test_http_requests.py

@@ -235,3 +235,14 @@ def test_requests_custom_auth(self):
         node.perform_request("GET", "/")
         (request,), _ = node.session.send.call_args
         assert request.headers["authorization"] == "Basic dXNlcm5hbWU6cGFzc3dvcmQ="
+
+    def test_path_prefix(self):
+        node = self._get_mock_node(
+            NodeConfig(
+                "http",
+                "localhost",
+                9200,
+                path_prefix="/test",
+            )
+        )
+        assert node.base_url == "http://localhost:9200/test"