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docs/debugging.rst

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+Debugging
+=========
+
+VCR.py has a few log messages you can turn on to help you figure out if
+HTTP requests are hitting a real server or not. You can turn them on
+like this:
+
+.. code:: python
+
+    import vcr
+    import requests
+    import logging
+
+    logging.basicConfig() # you need to initialize logging, otherwise you will not see anything from vcrpy
+    vcr_log = logging.getLogger("vcr")
+    vcr_log.setLevel(logging.INFO)
+
+    with vcr.use_cassette('headers.yml'):
+        requests.get('http://httpbin.org/headers')
+
+The first time you run this, you will see::
+
+    INFO:vcr.stubs:<Request (GET) http://httpbin.org/headers> not in cassette, sending to real server
+
+The second time, you will see::
+
+    INFO:vcr.stubs:Playing response for <Request (GET) http://httpbin.org/headers> from cassette
+
+If you set the loglevel to DEBUG, you will also get information about
+which matchers didn't match. This can help you with debugging custom
+matchers.