httpbin.org has public endpoints for HTTP Basic and Digest Authentication (in each example, replace :user and :passwd with the test values you’d like to check against – :qop, too, for Digest):
- /basic-auth/:user/:passwd Challenges HTTPBasic Auth.
- /hidden-basic-auth/:user/:passwd 404’d BasicAuth.
- /digest-auth/:qop/:user/:passwd Challenges HTTP Digest Auth.
Each endpoint is available in both HTTP and HTTPS.