Adding upstream version 5.7.1.upstream/5.7.1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 43 insertions, 0 deletions

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+.. SPDX-License-Identifier: GPL-3.0-or-later
+
+.. _mod-http-trace:
+
+Debugging a single request
+==========================
+
+Using query policies
+--------------------
+
+Query policies :any:`policy.DEBUG_ALWAYS`, :any:`policy.DEBUG_CACHE_MISS` or
+:any:`policy.DEBUG_IF` can be used to enable debug-level logging for selected
+subdomains or queries matching specific conditions. Please refer to
+:ref:`mod-policy-logging` for more information.
+
+Using HTTP module
+-----------------
+
+The :ref:`http module <mod-http>` provides ``/trace`` endpoint which allows to trace various
+aspects of the request execution. The basic mode allows you to resolve a query
+and trace debug-level logs for it (and messages received):
+
+.. code-block:: bash
+
+   $ curl https://localhost:8453/trace/e.root-servers.net
+   [ 8138] [iter] 'e.root-servers.net.' type 'A' created outbound query, parent id 0
+   [ 8138] [ rc ] => rank: 020, lowest 020, e.root-servers.net. A
+   [ 8138] [ rc ] => satisfied from cache
+   [ 8138] [iter] <= answer received:
+   ;; ->>HEADER<<- opcode: QUERY; status: NOERROR; id: 8138
+   ;; Flags: qr aa  QUERY: 1; ANSWER: 0; AUTHORITY: 0; ADDITIONAL: 0
+
+   ;; QUESTION SECTION
+   e.root-servers.net.		A
+
+   ;; ANSWER SECTION
+   e.root-servers.net. 	3556353	A	192.203.230.10
+
+   [ 8138] [iter] <= rcode: NOERROR
+   [ 8138] [resl] finished: 4, queries: 1, mempool: 81952 B
+
+See chapter about :ref:`mod-http` for further instructions how to load ``webmgmt``
+endpoint into HTTP module, it is a prerequisite for using ``/trace``.