`NoneType` object has no attribute 'items'

[ddhanak]

Expected Behavior

Triggering a lambda through an API Gateway without providing headers should not throw an error.

Actual Behavior

There is an error thrown when trying to extract the headers from the context.

Steps to Reproduce the Problem

1. Send a request using a lambda backed API Gateway endpoint (done through console) without providing headers
2. Check cloudwatch logs

Specifications

• Datadog Lambda Layer version: 62
• Python version: 3.9

Stacktrace

2022-09-12T10:37:18.731-04:00	Traceback (most recent call last):
  2022-09-12T10:37:18.731-04:00	File "/opt/python/lib/python3.9/site-packages/datadog_lambda/wrapper.py", line 167, in _before
  2022-09-12T10:37:18.731-04:00	dd_context, trace_context_source = extract_dd_trace_context(
  2022-09-12T10:37:18.731-04:00
File "/opt/python/lib/python3.9/site-packages/datadog_lambda/tracing.py", line 342, in extract_dd_trace_context
  File "/opt/python/lib/python3.9/site-packages/datadog_lambda/tracing.py", line 342, in extract_dd_trace_context
  2022-09-12T10:37:18.731-04:00	) = extract_context_from_http_event_or_context(event, lambda_context)
  2022-09-12T10:37:18.731-04:00
File "/opt/python/lib/python3.9/site-packages/datadog_lambda/tracing.py", line 178, in extract_context_from_http_event_or_context
  File "/opt/python/lib/python3.9/site-packages/datadog_lambda/tracing.py", line 178, in extract_context_from_http_event_or_context
  2022-09-12T10:37:18.731-04:00	lowercase_headers = {k.lower(): v for k, v in headers.items()}
  2022-09-12T10:37:18.731-04:00	AttributeError: 'NoneType' object has no attribute 'items'

[sfirrin]

Thanks a lot for your report @ddhanak, that PR should fix the issue.

I didn't mean to close this until it's released, I'm not able to do the release so my colleague is going to release in the next few hours and I will ping you here and close the issue then.

[ddhanak]

Awesome @sfirrin !

[sfirrin]

Hi @ddhanak, sorry for the delay, we are having an issue creating the release that we are working on resolving now

[sfirrin]

@ddhanak it's now released in https://github.com/DataDog/datadog-lambda-python/releases/tag/v64 so I'm going to close this out

Thanks again for opening the issue and please let us know if you're running into anything else