Fix compatibility with werkzeug 2.1.x

Update the code for werkzeug 2.1.x where `BaseResponse` class was
replaced by `Response`.

See: pallets/werkzeug#2276

Taken from postmanlabs#684

Author: mgorny

httpbin/core.py

@@ -28,7 +28,10 @@
 )
 from werkzeug.datastructures import WWWAuthenticate, MultiDict
 from werkzeug.http import http_date
-from werkzeug.wrappers import BaseResponse
+try:
+    from werkzeug.wrappers import Response
+except ImportError:  # werkzeug < 2.1
+    from werkzeug.wrappers import BaseResponse as Response
 from werkzeug.http import parse_authorization_header
 from flasgger import Swagger, NO_SANITIZER
 
@@ -76,7 +79,7 @@ def jsonify(*args, **kwargs):
 
 
 # Prevent WSGI from correcting the casing of the Location header
-BaseResponse.autocorrect_location_header = False
+Response.autocorrect_location_header = False
 
 # Find the correct template folder when running from a different location
 tmpl_dir = os.path.join(os.path.dirname(os.path.abspath(__file__)), "templates")

setup.py

@@ -35,7 +35,7 @@
     packages=find_packages(),
     include_package_data = True, # include files listed in MANIFEST.in
     install_requires=[
-        'Flask<2', 'MarkupSafe<2.1', 'decorator', 'itsdangerous<2.1', 'brotlipy',
-        'raven[flask]', 'werkzeug<2', 'gevent', 'flasgger', 'jinja2<3.1'
+        'Flask<2.3', 'MarkupSafe', 'decorator', 'itsdangerous', 'brotlipy',
+        'raven[flask]', 'werkzeug<2.3', 'gevent', 'flasgger', 'jinja2'
     ],
 )