support charset_normalizer (Azure#21520)

* support charset_normalizer

* update

* update

Author: xiangyan99

sdk/core/azure-core/CHANGELOG.md

@@ -1,16 +1,13 @@
 # Release History
 
-## 1.19.1 (Unreleased)
-
-### Features Added
-
-### Breaking Changes
+## 1.19.1 (2021-11-01)
 
 ### Bugs Fixed
 
 - respect text encoding specified in argument (thanks to @ryohji for the contribution)  #20796
 - Fix "coroutine x.read() was never awaited" warning from `ContentDecodePolicy`  #21318
 - fix type check for `data` input to `azure.core.rest` for python 2.7 users  #21341
+- use `charset_normalizer` if `chardet` is not installed to migrate aiohttp 3.8.0 changes.
 
 ### Other Changes
 

sdk/core/azure-core/azure/core/pipeline/transport/_aiohttp.py

@@ -28,10 +28,6 @@
     Any, Optional, AsyncIterator as AsyncIteratorType, TYPE_CHECKING, overload
 )
 from collections.abc import AsyncIterator
-try:
-    import cchardet as chardet
-except ImportError:  # pragma: no cover
-    import chardet  # type: ignore
 
 import logging
 import asyncio
@@ -373,6 +369,13 @@ def text(self, encoding: Optional[str] = None) -> str:
                     "Cannot guess the encoding of a not yet read body"
                 )
             else:
+                try:
+                    import cchardet as chardet
+                except ImportError:  # pragma: no cover
+                    try:
+                        import chardet  # type: ignore
+                    except ImportError:  # pragma: no cover
+                        import charset_normalizer as chardet  # type: ignore[no-redef]
                 encoding = chardet.detect(body)["encoding"]
         if encoding == "utf-8" or encoding is None:
             encoding = "utf-8-sig"