Injecting custom http headers in boto3

[rjeyasekar1]

I have a need to send a custom http header (x-amzn-logs-format: json/emf
) as a part of boto put_log_events call to write embedded metrics to CloudWatch logs.
Does boto3 provide any method to inject custom headers?

Thanks.

[swetashre]

@rjeyasekar1 - Thank you for your post. You can inject custom headers to an api call by registering it with boto3 events. Here is the link to the documentation with example:
https://boto3.amazonaws.com/v1/documentation/api/latest/guide/events.html

Please let me know if you have any more concerns.

[rjeyasekar1]

Thanks, let me try that out.
Cheers

[swetashre]

I am closing this issue as this has been resolved. Please reopen if you have any more concerns.

[ntextreme3]

@rjeyasekar1 did this work for you, and do you have an example? I haven't used boto before but was looking into testing something.

[bmbeverst]

@ntextreme3 here is an example that I got to work:

def add_emf_header(request, **kwargs):
    request.headers.add_header('x-amzn-logs-format', 'json/emf')
    print(request.headers). # Remove this after testing of course.

# You can even do this with watchtower! Use this instead, client = watchtower_handler.cwl_client
client = boto3.client('logs')
client.meta.events.register_first('before-sign.cloudwatch-logs.PutLogEvents', add_emf_header)