Remove case sensitive check in ASGIBrowserMiddleware check. (#1017)

* Remove case sensitive check in should_insert_html.

* [Mega-Linter] Apply linters fixes

* Remove header decoding.

---------

Co-authored-by: umaannamalai <[email protected]>

Author: umaannamalai

newrelic/api/asgi_application.py

@@ -97,7 +97,9 @@ def should_insert_html(self, headers):
         content_type = None
 
         for header_name, header_value in headers:
-            # assume header names are lower cased in accordance with ASGI spec
+            # ASGI spec (https://asgi.readthedocs.io/en/latest/specs/www.html#http) states
+            # header names should be lower cased, but not required
+            header_name = header_name.lower()
             if header_name == b"content-type":
                 content_type = header_value
             elif header_name == b"content-encoding":
@@ -318,7 +320,6 @@ async def nr_async_asgi(receive, send):
                 send=send,
                 source=wrapped,
             ) as transaction:
-
                 # Record details of framework against the transaction for later
                 # reporting as supportability metrics.
                 if framework: