httpd_req::sess_ctx field

Session Context Pointer A session context. Contexts are maintained across 'sessions' for a given open TCP connection. One session could have multiple request responses. The web server will ensure that the context persists across all these request and responses. By default, this is NULL. URI Handlers can set this to any meaningful value. If the underlying socket gets closed, and this pointer is non-NULL, the web server will free up the context by calling free(), unless free_ctx function is set.