[Bug?] Headers behaves differently under eager mode

[pkyosx]

I have a need to use headers to carry some context; however, when I tested it in eager mode and in real environment, it behaves differently. In eager mode, the headers are stored in request.headers but in real environment it stored under requests as attributes.

I'm currently handling two different cases to pass test and get it worked in real environment. However, it seems a bit odd for me. Not sure which behavior is expected in celery's original design.

Sample code:

from celery import Celery

app = Celery('main',
             broker_url="redis://redis/0",
             result_backend="redis://redis/0")

@app.task
def custom_header():
    return {"request.headers": custom_header.request.headers,
            "request.custom_foo": getattr(custom_header.request, "custom_foo", None)}

def main():
    app.conf.task_always_eager = True
    res = custom_header.apply_async(headers={"custom_foo": "custom_bar"}).get()
    print("Eager: %r" % res)

    app.conf.task_always_eager = False
    res = custom_header.apply_async(headers={"custom_foo": "custom_bar"}).get()
    print("Non-Eager: %r" % res)


if __name__ == "__main__":
    main()

Result:

Eager: {'request.headers': {'custom_foo': 'custom_bar'}, 'request.custom_foo': None}
Non-Eager: {'request.headers': None, 'request.custom_foo': 'custom_bar'}

Full Reproduce Steps: https://github.com/pkyosx/celery_headers_issue