Error in opentelemetry/instrumentation/django/middleware.py related to "wsgi.url_scheme"

[OmarEltamasehy]

Hi,
Appreciate your support.
We try to use DjangoInstrumentor by putting it in settings.py as the below,

from opentelemetry.instrumentation.django import DjangoInstrumentor
DjangoInstrumentor().instrument()

Our application uses Django channels and the above code gives us an error.
After debugging we found out that the cause of the error is in opentelemetry/instrumentation/django/middleware.py
related to "wsgi.url_scheme". Please check the stacktrace for details.

Any thoughts on how to bypass this issue in both development and production servers ?

My environment:
Django version 3.1.2
Python version 3.8
Channels version 2.2.0

Stack trace:

Traceback (most recent call last):
  File "/home/omar/workspace/testapp/testapp/venv/lib/python3.8/site-packages/django/core/handlers/exception.py", line 47, in inner
    response = get_response(request)
  File "/home/omar/workspace/testapp/testapp/venv/lib/python3.8/site-packages/django/utils/deprecation.py", line 113, in __call__
    response = self.process_request(request)
  File "/home/omar/workspace/testapp/testapp/venv/lib/python3.8/site-packages/opentelemetry/instrumentation/django/middleware.py", line 140, in process_request
    attributes = collect_request_attributes(environ)
  File "/home/omar/workspace/testapp/testapp/venv/lib/python3.8/site-packages/opentelemetry/instrumentation/wsgi/__init__.py", line 122, in collect_request_attributes
    result["http.url"] = wsgiref_util.request_uri(environ)
  File "/usr/lib/python3.8/wsgiref/util.py", line 72, in request_uri
    url = application_uri(environ)
  File "/usr/lib/python3.8/wsgiref/util.py", line 52, in application_uri
    url = environ['wsgi.url_scheme']+'://'
KeyError: 'wsgi.url_scheme'
[public ERROR  ] Internal Server Error: /
Traceback (most recent call last):
  File "/home/omar/workspace/testapp/testapp/venv/lib/python3.8/site-packages/django/core/handlers/exception.py", line 47, in inner
    response = get_response(request)
  File "/home/omar/workspace/testapp/testapp/venv/lib/python3.8/site-packages/django/utils/deprecation.py", line 113, in __call__
    response = self.process_request(request)
  File "/home/omar/workspace/testapp/testapp/venv/lib/python3.8/site-packages/opentelemetry/instrumentation/django/middleware.py", line 140, in process_request
    attributes = collect_request_attributes(environ)
  File "/home/omar/workspace/testapp/testapp/venv/lib/python3.8/site-packages/opentelemetry/instrumentation/wsgi/__init__.py", line 122, in collect_request_attributes
    result["http.url"] = wsgiref_util.request_uri(environ)
  File "/usr/lib/python3.8/wsgiref/util.py", line 72, in request_uri
    url = application_uri(environ)
  File "/usr/lib/python3.8/wsgiref/util.py", line 52, in application_uri
    url = environ['wsgi.url_scheme']+'://'
KeyError: 'wsgi.url_scheme'

[lzchen]

Moving to contrib repo.

[OmarEltamasehy]

Any update regarding this issue ?

[srikanthccv]

@OmarEltamasehy Django instrumentation doesn't support the ASGI yet. There are also other things that should be done along with fixing this issue to make it work with ASGI. Please look at #334 for more details.

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