HTTP Methods Supported¶

SWS only supports GET, HEAD and OPTIONS HTTP methods.

OPTIONS Method¶

Identifying allowed request methods¶

The HTTP OPTIONS method can be used to send a request to check for permitted communication options for either a given URL or server.

Example using an HTTP client.

curl -I -X OPTIONS http://localhost:8787/assets/main.js
# HTTP/1.1 204 No Content
# allow: OPTIONS, HEAD, GET
# accept-ranges: bytes
# cache-control: public, max-age=31536000
# date: Thu, 10 Mar 2022 21:26:01 GMT

Preflight requests in CORS¶

The HTTP OPTIONS method can also be used to send a request asking if it is acceptable to send requests to the server and if it is aware of using specific methods and headers.

Tip

If an Access-Control-Request-Method or Access-Control-Request-Headers value is not allowed then the server replies with a 403 Forbidden HTTP error. See CORS feature for more details.

Example using an HTTP client.

curl http://localhost:8787/assets/main.js \
    -I -X OPTIONS \
    -H "Access-Control-Request-Method: HEAD" \
    -H "Access-Control-Request-Headers: content-type" \
    -H "Origin: http://localhost:8787"
# HTTP/1.1 204 No Content
# access-control-allow-origin: http://localhost:8787
# accept-ranges: bytes
# access-control-allow-headers: content-type, origin
# access-control-allow-methods: GET, OPTIONS, HEAD
# cache-control: public, max-age=31536000
# date: Thu, 10 Mar 2022 21:45:55 GMT