ASGI Middleware

spangle uses only one middleware: starlette.ServerErrorMiddleware . You can use other ASGI middlewares with spangle .

Append middlewares

To use middlewares, call Api.add_middleware with callable and its config.

from spangle import Api
from starlette.middleware.trustedhost import TrustedHostMiddleware

api = Api()
api.add_middleware(TrustedHostMiddleware, allowed_hosts=['example.com', '*.example.com'])

Middlewares order

When ASGI middlewares are added like this:

middlewares = [m1,m2,m3]
for m in middlewares:
    api.add_middleware(m)

… then, the application looks like this:

call m3(scope, receive, send):
    *m3 preprocess*
    call m2(scope, receive, send):
        *m2 preprocess*
        call m1(scope, receive, send):
            *m1 preprocess*
            call api(scope, receive, send)
            *m1 postprosess*
        *m2 postprosess*
    *m3 postprosess*

Be careful in order of middlewares.