Sets the SNI (Server Name Indication) to `sni_hostname` for all client connections created from this context. @returns a function object for chaining

Returns whether this address contains only zeros, i.e., equals `::`.

Schedules a call to `fn` on the multiplexer when this socket manager cleans up its state. @note Must be called before `start`.

Returns the HTTP body (payload).

Causes the publisher to stop producing items for the subscriber. Any in-flight items may still get dispatched. @post `!valid()`

Returns the ::type_id of the category for this error. @pre `*this != none`

Returns the coordinator used by this fixture.

Cancel the action if it has not been invoked yet.

Writes an entry to the event-queue of the logger. @threadsafe

Returns whether the list has no elements.

Returns an iterator to the end.

Restores a consistent, empty state.

@private

@relates message_data