gh-91996: Add an HTTPMethod StrEnum to http (GH-91997)

* Add HTTPMethod enum to http

Create a StrEnum for the 9 common HTTP methods.

Co-authored-by: Ethan Furman <ethan@stoneleaf.us>

Lib/http/__init__.py

@@ -1,6 +1,6 @@
-from enum import IntEnum, _simple_enum
+from enum import StrEnum, IntEnum, _simple_enum
 
-__all__ = ['HTTPStatus']
+__all__ = ['HTTPStatus', 'HTTPMethod']
 
 
 @_simple_enum(IntEnum)
@@ -149,3 +149,32 @@ class HTTPStatus:
     NETWORK_AUTHENTICATION_REQUIRED = (511,
         'Network Authentication Required',
         'The client needs to authenticate to gain network access')
+
+
+@_simple_enum(StrEnum)
+class HTTPMethod:
+    """HTTP methods and descriptions
+
+    Methods from the following RFCs are all observed:
+
+        * RFC 7231: Hypertext Transfer Protocol (HTTP/1.1), obsoletes 2616
+        * RFC 5789: PATCH Method for HTTP
+    """
+    def __new__(cls, value, description):
+        obj = str.__new__(cls, value)
+        obj._value_ = value
+        obj.description = description
+        return obj
+
+    def __repr__(self):
+        return "<%s.%s>" % (self.__class__.__name__, self._name_)
+
+    CONNECT = 'CONNECT', 'Establish a connection to the server.'
+    DELETE = 'DELETE', 'Remove the target.'
+    GET = 'GET', 'Retrieve the target.'
+    HEAD = 'HEAD', 'Same as GET, but only retrieve the status line and header section.'
+    OPTIONS = 'OPTIONS', 'Describe the communication options for the target.'
+    PATCH = 'PATCH', 'Apply partial modifications to a target.'
+    POST = 'POST', 'Perform target-specific processing with the request payload.'
+    PUT = 'PUT', 'Replace the target with the request payload.'
+    TRACE = 'TRACE', 'Perform a message loop-back test along the path to the target.'