Online curl test - A HTTP header check for any URL which avoids a curl windows installation.
HTTP/2 - Brotli - Free SSL - Instant PurgeFree Test Account
This tool is typically used to test the X-Pull configuration of your server, check if hotlink protection is working, or provide you with the full details of the HTTP response header with cURL in the background, such as:
HTTP status codes
And check if you have HTTP security headers in place, such as:
cURL is an open source command line tool used for transferring data with URL syntax, in this tool's case, HTTP and HTTPS requests.