YYEventSource

博客：Server-Sent Events / EventSource

Start server on http://127.0.0.1:8844/stream.

node sse-server.js

Open the url in browser.

or

Request by OC code.

#import "EventSource.h"

connect:

NSString *url = @"http://127.0.0.1:8844/stream";
EventSource *eventSource = [EventSource eventSourceWithURL:[NSURL URLWithString:url]];

[eventSource onMessage:^(Event *e) {
    dispatch_async(dispatch_get_main_queue(), ^{
        NSLog(@"%@", e);
    });
}];

[eventSource onError:^(Event *event) {
    NSLog(@"error:%@", event.error);
}];

You will see the message in console.

PS: Base on code.