🩹 Add vnd.oai.openapi to mime type list that are not base64 encoded (#271)

Author: khamaileon

docs/adapter.md

@@ -7,7 +7,6 @@ handler = Mangum(
     app,
     lifespan="auto",
     api_gateway_base_path=None,
-    text_mime_types=None,
 )
 ```
 

docs/http.md

@@ -33,14 +33,13 @@ Binary responses are determined using the `Content-Type` and `Content-Encoding`
 
 ### Text MIME types
 
-By default, all response data will be [base64 encoded](https://docs.python.org/3/library/base64.html#base64.b64encode) and include `isBase64Encoded=True` in the response ***except*** the default text MIME types and any MIME types included in the `TEXT_MIME_TYPES` list setting.
-
-The following types are excluded from binary responses by default:
+By default, all response data will be [base64 encoded](https://docs.python.org/3/library/base64.html#base64.b64encode) and include `isBase64Encoded=True` in the response ***except*** the following MIME types:
 
 - `application/json`
 - `application/javascript`
 - `application/xml`
 - `application/vnd.api+json`
+- `application/vnd.oai.openapi`
 
 Additionally, any `Content-Type` header prefixed with `text/` is automatically excluded.
 

mangum/handlers/utils.py

@@ -11,6 +11,7 @@
     "application/javascript",
     "application/xml",
     "application/vnd.api+json",
+    "application/vnd.oai.openapi",
 ]