Streaming Responses in Django APIs: Line-by-Line Output

To respond line by line in a Django API, you can use the StreamingHttpResponse class provided by Django. Here's an example:

from django.http import StreamingHttpResponse

def stream_response(request):
    def stream():
        yield 'First line\n'
        yield 'Second line\n'
        yield 'Third line\n'

    response = StreamingHttpResponse(stream(), content_type='text/plain')
    response['Content-Disposition'] = 'attachment; filename='lines.txt''
    return response

In this example, we define a function stream() that yields each line of text as a separate string, separated by newline characters. We then create a StreamingHttpResponse object that uses stream() as its source of content. Finally, we set the Content-Disposition header to suggest that the response should be downloaded as a file named 'lines.txt'.

When a client makes a request to this view, they will receive a response with the lines of text streamed to them one at a time, with each line separated by a newline character.