Fix unhandled api_gateway_base_path in AwsHttpGateway (#204)

Co-authored-by: Xavier Payn <xavier.payn@adaptive-channel.com>

Author: xpayn

mangum/handlers/abstract_handler.py

@@ -101,7 +101,9 @@ def from_trigger(
         if "version" in trigger_event and "requestContext" in trigger_event:
             from . import AwsHttpGateway
 
-            return AwsHttpGateway(trigger_event, trigger_context, **kwargs)
+            return AwsHttpGateway(
+                trigger_event, trigger_context, **kwargs  # type: ignore
+            )
 
         if "resource" in trigger_event:
             from . import AwsApiGateway

mangum/handlers/aws_api_gateway.py

@@ -74,11 +74,8 @@ def request(self) -> Request:
 
         if not path:
             path = "/"
-        elif self.api_gateway_base_path and self.api_gateway_base_path != "/":
-            if not self.api_gateway_base_path.startswith("/"):
-                self.api_gateway_base_path = f"/{self.api_gateway_base_path}"
-            if path.startswith(self.api_gateway_base_path):
-                path = path[len(self.api_gateway_base_path) :]
+        else:
+            path = self._strip_base_path(path)
 
         return Request(
             method=http_method,
@@ -93,6 +90,14 @@ def request(self) -> Request:
             event_type=self.TYPE,
         )
 
+    def _strip_base_path(self, path: str) -> str:
+        if self.api_gateway_base_path and self.api_gateway_base_path != "/":
+            if not self.api_gateway_base_path.startswith("/"):
+                self.api_gateway_base_path = f"/{self.api_gateway_base_path}"
+            if path.startswith(self.api_gateway_base_path):
+                path = path[len(self.api_gateway_base_path) :]
+        return path
+
     @property
     def body(self) -> bytes:
         body = self.trigger_event.get("body", b"") or b""

mangum/handlers/aws_http_gateway.py

@@ -2,11 +2,11 @@
 import urllib.parse
 from typing import Dict, Any
 
-from .abstract_handler import AbstractHandler
+from . import AwsApiGateway
 from .. import Response, Request
 
 
-class AwsHttpGateway(AbstractHandler):
+class AwsHttpGateway(AwsApiGateway):
     """
     Handles AWS HTTP Gateway events (v1.0 and v2.0), transforming them into ASGI Scope
     and handling responses
@@ -86,6 +86,8 @@ def request(self) -> Request:
 
         if not path:
             path = "/"
+        else:
+            path = self._strip_base_path(path)
 
         return Request(
             method=http_method,