Log "WWW-Authenticate" header in HttpLoggingPolicy (Azure#22990)

* Log "WWW-Authenticate" header in `HttpLoggingPolicy`

* Update CHANGELOG.md

Author: xiangyan99

sdk/core/azure-core/CHANGELOG.md

@@ -10,6 +10,8 @@
 
 ### Other Changes
 
+- Log "WWW-Authenticate" header in `HttpLoggingPolicy`  #22990
+
 ## 1.22.1 (2022-02-09)
 
 ### Bugs Fixed

sdk/core/azure-core/azure/core/pipeline/policies/_universal.py

@@ -381,6 +381,7 @@ class HttpLoggingPolicy(SansIOHTTPPolicy):
         "Server",
         "Transfer-Encoding",
         "User-Agent",
+        "WWW-Authenticate", # OAuth Challenge header.
     ])
     REDACTED_PLACEHOLDER = "REDACTED"
     MULTI_RECORD_LOG = "AZURE_SDK_LOGGING_MULTIRECORD"

sdk/core/azure-core/tests/test_pipeline.py

@@ -64,6 +64,7 @@ def test_default_http_logging_policy(http_request):
     pipeline = pipeline_client._build_pipeline(config)
     http_logging_policy = pipeline._impl_policies[-1]._policy
     assert http_logging_policy.allowed_header_names == HttpLoggingPolicy.DEFAULT_HEADERS_WHITELIST
+    assert "WWW-Authenticate" in http_logging_policy.allowed_header_names
 
 @pytest.mark.parametrize("http_request", HTTP_REQUESTS)
 def test_pass_in_http_logging_policy(http_request):