asgi-cors-strawberry

ASGI middleware to apply CORS header especially for Strawberry GraphQL

installation

 pip install asgi-cors-strawberry

when to use

According to mdn MDN - CORS, cross-origin requests are preflighted using OPTIONS method. The response from preflight has Access-Control-Allow-Origin, Access-Control-Allow-Headers, etc.

Since Strawberry GraphQL Consumer is designed to handle only GET and POST methods, if you use general ASGI CORS middleware, you will get a 405 code as a response to preflight.

• Our middleware responds with Okay status in case of OPTIONS method
• Our middleware checks Access-Control-Allow-Origin from hosts, wildcards setting, All hosts are allowed by default!
• Our middleware adds Content-Type in Access-Control-Allow-Headers, because gql will be passed to the request

how to use

# in django asgi.py


from asgi_cors_strawberry import CorsMiddleware

...

application = ProtocolTypeRouter(
    {
        "http": URLRouter(
            [
                re_path(r"^graphql", GraphQLHTTPConsumer.as_asgi(schema=schema)),
                re_path(r"^", get_asgi_application()),
            ]
        ),
        "websocket": URLRouter([
            re_path(r"^graphql", GraphQLWSConsumer.as_asgi(schema=schema))
        ])

    }
)

application = CorsMiddleware(application)

The example above is an ASGI application using Strawberry-GraphQL[Channels]

CorsMiddleware parameters

• CorsMiddleware(application, allow_all=True, hosts=[ ], host_wildcards=[ ], headers=["content-type", "authorization"])

allow_all

True if all hosts are allowed

hosts

if allow_all is False, hosts is a list of allowed hosts

host_wildcards

you can use wildcards in hosts, like ["*.example.com"]

headers

you can add headers to Access-Control-Allow-Headers

default header is "content-type" because gql will be passed to the request

TODO

• testcase