keep-alive

I really need help here... I have a simple Android application that connects to my sever to fetch data over HTTPS. Everything is working fine up until i connected to the same server from another device (iOS or Android). I am starting to get timeouts or connection refused or other errors depending on the library that I use (sometimes SSL handshake) I tried 2 android app on the same router - fails I tried Volley, Retrofit, plain http library - fails if one device is connected via cellular network and one on wifi, it is working fine. However, i have seen cases that it fails even using 2 devices

前言 http协议是互联网中最重要的协议之一，虽然看上去很简单，但是实际中经常遇到问题，我们就已经遇到好几次了。有长连接相关的，有报文解析相关的。对http协议不能一知半解，必须透彻理解才行。本文通过一个线上实例，详细介绍http协议中的content-length字段。 问题 我们的手机App在做更新时会从服务器上下载的一些资源，一般都是一些小文件，更新的代码差不多是下面这样的： static void update() throws IOException { URL url = new URL("http://172.16.59.129:8000/update/test.so"); HttpURLConnection conn = (HttpURLConnection) url.openConnection(); if(conn.getResponseCode() == 200) { int totalLength = conn.getContentLength(); BufferedInputStream in = new BufferedInputStream(conn.getInputStream()); byte[] buffer = new byte[512]; int readLength = 0; int length = 0; while((length=in

1.限制ip访问： 白名单 allow 127.0.0.1；##允许127.0.0.1访问 deny all；##其他ip全部拒绝 黑名单 deny 127.0.0.1；##拒绝这个ip访问 deny 1.1.1.1；##拒绝访问 配置 allow 127.0.0.1; ##允许这个ip访问 allow 192.168.222.0/24; ##允许这个网段访问 deny all; ##剩下全部拒绝 测试 # curl -x127.0.0.1:80 bbs.centos.com -I ##127.0.0.1可以访问 HTTP/1.1 200 OK Server: nginx/1.17.0 Date: Sun, 13 Oct 2019 05:03:38 GMT Content-Type: text/html; charset=utf-8 Connection: keep-alive X-Powered-By: PHP/7.3.0 Set-Cookie: d0iK_2132_saltkey=h6XT6j4q; expires=Tue, 12-Nov-2019 05:03:38 GMT; Max-Age=2592000; path=/; HttpOnly Set-Cookie: d0iK_2132_lastvisit=1570939418; expires=Tue, 12-Nov-2019

Ken Coding 我的公号 看看面试题，只是为了查漏补缺，看看自己那些方面还不懂。 切记不要以为背了面试题，就万事大吉了，最好是理解背后的原理，这样面试的时候才能侃侃而谈。 不然，稍微有水平的面试官一看就能看出，是否有真才实学还是刚好背中了这道面试题。（都是一些基础的vue面试题，大神可一起回顾下） 一、对于MVVM的理解？ MVVM 是 Model-View-ViewModel 的缩写。 Model代表数据模型，也可以在Model中定义数据修改和操作的业务逻辑。 View 代表UI 组件，它负责将数据模型转化成UI 展现出来。 ViewModel 监听模型数据的改变和控制视图行为、处理用户交互，简单理解就是一个同步View 和 Model的对象，连接Model和View。 在MVVM架构下，View 和 Model 之间并没有直接的联系，而是通过ViewModel进行交互。 Model 和 ViewModel 之间的交互是双向的， 因此View 数据的变化会同步到Model中，而Model 数据的变化也会立即反应到View 上。 ViewModel 通过双向数据绑定把 View 层和 Model 层连接了起来，而View 和 Model 之间的同步工作完全是自动的，无需人为干涉。 因此开发者只需关注业务逻辑，不需要手动操作DOM, 不需要关注数据状态的同步问题

Long time ASP.NET Webforms developer, new to Ajax development (mostly via the UpdatePanel control !). Since no postbacks are happening the server does not reset the user’s session timeout counter, even though a user is interacting with a page and refreshing parts of it. I would like to know what is the simplest and standard way of keeping the ASP.NET session alive, when one is developing Ajax with the UpdatePanel; Please provide code and/or links in your answer; The stuff i searched talks about frameworks, JQuery, JSON, and whatever is the flavour of the month acronym, i don't need anything

is there a way in c# to be able to ping a url every 15 minutes and get a response back from the server? i want to try to see if .net can be used to build a simple tool to have asp.net websites invoke a re-build so that the first user doesn't incur the load penalty when the application is started. or if anyone has an alternative method of accomplishing the same goal... thoughts? tips? ideas? Typically the person pushing a release should visit after they've uploaded the site just for test sake (make sure nothing bombed out). But if you're looking for a programmatic approach, WebClient may be