long-polling

问题 Hi guys I'm trying to communicate with an Asp.Net core 2.1 application that uses SignalR to establish its chat communications, but I can't figure out what's the best way to accomplish that using flutter. I've searched for some library to do that, but the one that I found was not compatible with Flutter, just with Dart web as it uses the original SignalR.js to wrap the methods. Do you guys have any tips on how to accomplish that task ? 回答1: I just created a Flutter client for SignalR (ASP.NET

问题 Im currently polling data with from an Database with an regular interval. For the backend I'm using C# and MVC2 as framework. As I'm fetching data with an interval of 10 seconds now I would like to in the backend in my controller implement some kind of conditional that will parse the http header and not fetch the data again if it has not been modified since last fetch. I'm not really sure how I would go about with this. Anyone have any good suggestions?! Regards 回答1: Why mess around with http

问题 Im currently polling data with from an Database with an regular interval. For the backend I'm using C# and MVC2 as framework. As I'm fetching data with an interval of 10 seconds now I would like to in the backend in my controller implement some kind of conditional that will parse the http header and not fetch the data again if it has not been modified since last fetch. I'm not really sure how I would go about with this. Anyone have any good suggestions?! Regards 回答1: Why mess around with http

问题 Im currently polling data with from an Database with an regular interval. For the backend I'm using C# and MVC2 as framework. As I'm fetching data with an interval of 10 seconds now I would like to in the backend in my controller implement some kind of conditional that will parse the http header and not fetch the data again if it has not been modified since last fetch. I'm not really sure how I would go about with this. Anyone have any good suggestions?! Regards 回答1: Why mess around with http

问题 I am trying to implement a global button counter that updates as any/different users click it. So the idea is if one person clicks the button, I see the counter update on my instance of the page. I currently have the long polling technique working, or so I think, but after review I believe I have an error with "broadcasting" the update to all browsers. The error currently is that if for example I have two browsers open, and I continuously click on one browser, that browser that I click the

问题 I need to check if commands are written to a txt file in order to update a 3D window inside my web browser. This is what is known as "push" technique or long polling to notify the client. As the browser has to be Internet Explorer I am a bit limited. I have come up with a solution using a hidden iframe that calls a php script that reloads every second to check the txt file. <iframe noresize scrolling="no" frameborder="0" name="loader" src="loader.php"> The loader.php basically does this: /

问题 I need to implement long polling in my application to retrieve the events. But I have no idea how to do it. I know the concept of long polling, i.e to leave the connection open, until an event occurs. But how do I do implement this in my project. If you could give me a simple long polling example of client side and the views i guess, I would really appreciate. Thank you! 回答1: very simple example: import time def long_polling_view(request): for i in range(30): #e.g. reopen connection every 30

问题 I'm trying to do long polling with JQuery and Python under the Flask Framework. Having done long polling before in PHP, I've tried to go about it in the same way: A script/function that has a while(true) loop, checking for changes periodically eg.every 0,5 seconds in the database, and returns some data when a change occurs. So in my ini .py I've created an app.route to /poll for JQuery to call. JQuery gives it some information about the client's current state, and the poll() function compares

问题 I need to do API calls to display the progress of something. I have created a service which does this every 1.5 seconds Main Component private getProgress() { this.progressService.getExportProgress(this.type, this.details.RequestID); } Services.ts public getExportProgress(type: string, requestId: string) { Observable.interval(1500) .switchMap(() => this.http.get(this.apiEndpoint + "Definition/" + type + "/Progress/" + requestId)) .map((data) => data.json().Data) .subscribe( (data) => { if (

问题 I'm working on realtime AJAX application with long polling in NodeJS. I would like to detect when user closes the tab with pending long-polling request. I use NodeJS connection close event: request.connection.on('close', function () { console.log(request.url); ... }); The AJAX loop looks like this: var EventLoop = new (function () { var self = this; this.listen = function () { $.postJSON( 'recieve-events', { /* some data not important for this issue */ }, function (data) { ... self.listen();