push_stream_publisher
The `push_stream_publisher` directive enables a location to act as a publisher endpoint for streaming messages to subscribers.
Description
The push_stream_publisher directive is part of the NGINX Push Stream Module, allowing the designated location to handle incoming messages from clients. It requires a location context and has the unique ability to manage messages sent by publishers to specific channels. When configured, it identifies the message's destination channel via the query string, typically using a ?id= parameter. This functionality is fundamental for building a real-time message broadcasting service utilizing protocols like EventSource and WebSocket.
When a request is made to the publisher endpoint, the server expects to receive a POST method containing the data to be distributed to subscribers of the specified channel. The directive thus directly contributes to the real-time communication model by enabling the publishing of messages, which can then be streamed to any active subscribers connected to that channel. The presence of the publisher endpoint complements the subscriber function of the push_stream_subscriber directive, thereby facilitating a complete pub/sub architecture.
To ensure proper operation, this directive must be paired with a corresponding subscriber location. Furthermore, it is important to configure appropriate access permissions and authentication where necessary, as publishing should typically be controlled to prevent abuse or unauthorized content delivery.
Config Example
server {
location /pub {
push_stream_publisher admin;
push_stream_channels_path $arg_id;
}
}Ensure that the query string ID parameter is properly set, as it is crucial for channel identification.
This directive should not be used without a corresponding subscriber directive; otherwise, published messages will have no recipients.
Access control may be necessary to prevent unauthorized posting of messages. Consider implementing security measures.