new: post /_admin/echo (#310)

* new: `Database. echo_request()`

* remove: `echo_request`

arango/database.py

@@ -570,14 +570,23 @@ def response_handler(resp: Response) -> datetime:
 
         return self._execute(request, response_handler)
 
-    def echo(self) -> Result[Json]:
-        """Return details of the last request (e.g. headers, payload).
-
+    def echo(self, body: Optional[Any] = None) -> Result[Json]:
+        """Return details of the last request (e.g. headers, payload),
+        or echo the given request body.
+
+        :param body: The body of the request. Can be of any type
+            and is simply forwarded. If not set, the details of the last
+            request are returned.
+        :type body: dict | list | str | int | float | None
         :return: Details of the last request.
         :rtype: dict
         :raise arango.exceptions.ServerEchoError: If retrieval fails.
         """
-        request = Request(method="get", endpoint="/_admin/echo")
+        request = (
+            Request(method="get", endpoint="/_admin/echo")
+            if body is None
+            else Request(method="post", endpoint="/_admin/echo", data=body)
+        )
 
         def response_handler(resp: Response) -> Json:
             if not resp.is_success:

docs/admin.rst

@@ -54,6 +54,9 @@ database.
     # Echo the last request.
     sys_db.echo()
 
+    # Echo a request
+    sys_db.echo('request goes here')
+
     # Reload the routing collection.
     sys_db.reload_routing()
 

tests/test_database.py

@@ -172,6 +172,12 @@ def test_database_misc_methods(client, sys_db, db, bad_db, cluster, secret):
         bad_db.echo()
     assert err.value.error_code in {11, 1228}
 
+    # Test echo (forward request)
+    body = "request goes here"
+    echo = db.echo(body)
+    assert isinstance(echo, dict)
+    assert echo["requestBody"] == body
+
     # Test read_log with default parameters
     # Deprecated in 3.8.0
     # TODO: Remove in future release