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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
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trafficserver
Apache Traffic Server™ is a fast, scalable and extensible HTTP/1.1 and HTTP/2 compliant caching proxy server.
> Is there some document somewhere that goes over the choices, overlaps, etc?
I believe Apache Traffic Server doesn't really compete with the likes of nginx or traefik. Apache Traffic Server is a HTTP caching server/web accelerator, thus it's specialized for caching HTTP requests and consequently it's simpler to deploy and configure. With that in mind, it competes with the likes of Squid[1] or Varnish[2].
[1] http://www.squid-cache.org/
[2] https://varnish-cache.org/
> Is there some document somewhere that goes over the choices, overlaps, etc?
I believe Apache Traffic Server doesn't really compete with the likes of nginx or traefik. Apache Traffic Server is a HTTP caching server/web accelerator, thus it's specialized for caching HTTP requests and consequently it's simpler to deploy and configure. With that in mind, it competes with the likes of Squid[1] or Varnish[2].
[1] http://www.squid-cache.org/
[2] https://varnish-cache.org/
Although haproxy and nginx cover (for me) almost all use-cases I had to deal with (with OpenResty [1] as a backup), I see one place where ATS could shine: plugins. From examples [2], C API looks sane and well documented, and this is very important if you want to add some custom stuff inside your proxy server without losing your hair. And no, lua isn't the solution here ;)
Those who had to deal with nginx plugins, I feel your pain...
[1] https://openresty.org/en/
[2] https://github.com/apache/trafficserver/tree/master/example/...