Fix get_config to be compatible with openapi spec

.gitignore

@@ -1,6 +1,8 @@
 # Project
 tools/*/
 tools/*.tar.gz
+.vscode
+.envrc
 
 # Byte-compiled / optimized / DLL files
 __pycache__/

setup.py

@@ -1,16 +1,13 @@
 import platform
 from pathlib import Path
 
-from packaging.version import Version
 from setuptools import find_packages
 from setuptools import setup
 
-if Version(platform.python_version()) < Version('3.0.0'):
-    raise Exception("`swagger-ui-py` support python version >= 3.0.0 only.")
-
 setup(
     name='swagger-ui-py',
     version='23.8.23',
+    python_requires='>3.8.0',
     description=(
         'Swagger UI for Python web framework, '
         'such as Tornado, Flask, Quart, Sanic and Falcon.'

swagger_ui/core.py

@@ -1,6 +1,5 @@
 import copy
 import importlib
-import re
 import urllib.request
 from pathlib import Path
 
@@ -142,12 +141,13 @@ def get_config(self, host):
                 config = _load_config(config_file.read())
         elif self.config_spec:
             config = _load_config(self.config_spec)
+        else:
+            raise RuntimeError('No config found!')
 
         version = config.get('openapi', '2.0.0')
         if Version(version) >= Version('3.0.0'):
             for server in config.get('servers', []):
-                server['url'] = re.sub(r'//[a-z0-9\-\.:]+/?',
-                                       '//{}/'.format(host), server['url'])
+                server['url'] = server['url']
         elif 'host' not in config:
             config['host'] = host
         return config