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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: 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.
!!! info "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](./cors.md) 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: max-age=31536000
# date: Thu, 10 Mar 2022 21:45:55 GMT