Issue: 'coroutine' object has no attribute 'headers' in Middleware

[ARYAN-NIKNEZHAD]

I'm encountering an issue with the DynamicResponseMiddleware where I get the error 'coroutine' object has no attribute 'headers'. This occurs when processing the response in the process_response method, specifically at response.headers.get("Content-Type", ""). It seems like the get_response function might be asynchronous, returning a coroutine instead of an actual HttpResponse object. Since Django 3.1+, middleware can be synchronous or asynchronous, and if an async view is being processed, get_response needs to be awaited. A possible solution could be modifying call to check if get_response is asynchronous and properly await it when necessary.

[MEHRSHAD-MIRSHEKARY]

You're right—since Django 3.1+, middleware can be synchronous or asynchronous, and if get_response is asynchronous, it must be awaited. The error 'coroutine' object has no attribute 'headers' suggests that get_response is returning a coroutine rather than an HttpResponse, likely because an async view is being processed.