WSGIcompatible

WSGI-compatible refers to software that conforms to the Web Server Gateway Interface (WSGI), a standardized interface between Python web servers and Python web applications or frameworks. Established to promote portability and interoperability, WSGI defines how a server hands a request to an application and how the application returns a response. A WSGI-compliant application is a callable, typically defined as def application(environ, start_response): ...; it receives two arguments: environ, a dict-like object containing request data and environment variables, and start_response, a callable used to begin the HTTP response. The application must return an iterable yielding byte strings. It should call start_response with a status string (e.g., '200 OK') and a list of (header_name, header_value) tuples before yielding the body. The write() callable may be provided for back-compatibility but is optional and rarely used.

WSGI servers, such as Gunicorn, uWSGI, or mod_wsgi, import or load a WSGI application and route HTTP requests by invoking it per request. Middleware can wrap applications to modify environment or response. Popular Python frameworks like Django, Flask, and Pyramid are WSGI-compatible, as are many microframeworks and WSGI adapters.

Note that WSGI is synchronous by design (distinct from ASGI) and expects the body to be bytes in Python 3. Correct handling of headers, streaming, and error handling are important for compatibility across servers and middleware.