Glossary

ASGI

The Asynchronous Server Gateway Interface, the interface between async Python web servers and applications. uvicorn is an ASGI server; Starlette is an ASGI framework.

blob

A file stored outside the ZODB's object records, read from a blob directory or a blob cache.

event loop

The single thread that an ASGI server uses to wait on every socket at once.

limiter

An anyio capacity limiter: a bound on how many calls run in worker threads at once. ploneasgi keeps one for WSGI calls and native routes, and another for body reads.

native route

An ASGI endpoint served beside Zope, under the reserved prefix, rather than published by ZPublisher.

PAS

The Pluggable Authentication Service, Plone's user folder, acl_users.

PasteDeploy

The library that reads zope.ini and builds the WSGI pipeline from it. ploneasgi replaces it with a server script and environment variables.

Plone

Plone is an open-source content management system.

reserved prefix

The path prefix, /++asgi++ by default, under which native routes are served.

stream iterator

An object providing ZPublisher.Iterators.IStreamIterator, such as filestream_iterator. Zope returns one for a file download, and closes the ZODB connection before it is read.

VirtualHostMonster

VHM

The Zope object that rewrites URLs for a public host. A proxy sends it a path such as /VirtualHostBase/https/www.example.org:443/Plone/VirtualHostRoot/.

waitress

The WSGI server Plone uses by default, started by runwsgi from zope.ini.

worker thread

A thread from a limiter's pool, in which blocking work runs off the event loop.

WSGI

The Web Server Gateway Interface, defined in PEP 3333. A WSGI application is a blocking call that returns an iterable of bytes. Zope is a WSGI application.

ZODB

The Zope Object Database, where Plone keeps its content.