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Old applications, like wordpress, are only supported and documented on Apache.

Not true: https://codex.wordpress.org/Nginx

I've found that more often than not, this is because those who are constrained to smaller budgets tend to be personally invested in the success of their business where return on investment is of critical importance (i.e. small business owners).

Aside from the specifications, are there any resources you would recommend for implementing OpenID Connect? The results of a quick Google search are relatively sparse.

They've likely been committing to a private repository and only recently made the source publicly available on GitHub.

Although I haven't advertised it well, there's also an API available for 3rd party use. Example request:

http://api.libroipsum.com/literature/cicero.json?words=100&#...

All sources:

http://api.libroipsum.com/sources.json

Supports JSON, JSONP, XML, and plain-text (TXT) - simply replace JSON with appropriate extension.