Study, research and implementation of WebSocket protocol

1. What is WebSocket? WebSocket is a protocol specification proposed by HTML5, referring to rfc6455. WebSocket the specification of a communication, through a handshake mechanism, between the client (browser) and the server (webserver) can establish

Base64 | Base32 | BASE16 Coding and decoding summary

1.BASE64 Introduction Base64 is a representation of binary data based on 64 printable characters. Base64 encoding generally has the following two uses: A) All binaries can thus be converted to printable text encoding (all become ASCII printable chara

Analysis of the implementation of zookeeper storage

Zookeeper storage is basically done on a single thread syncrequestprocessor 1) Initialize 1.1) Datatree initialization Public Datatree () {/ * rather than fight it, let Root has an alias * /Nodes.put ("", root); Nodes.put (Roo

Uncover Facebook's system architecture

Facebook is a social networking service website, and Facebook is the number one photo sharing site in the United States, uploading 8.5 million photos a day. So what is the Facebook system architecture like? This article will reveal to you. Source: H

Qt determines whether a file or folder exists and creates a folder

1. Determine if a folder exists Parameter description: QString fullpath;//folder full path /* Method 1*/ BOOL Isdirexist (QString FullPath) { Qdir dir (FullPath); if (Dir.exists ()) { return true; } return false; } /* Method 2*/ BOOL Isdirexist (QStr

Tree chain split Template Title summary

Records a few tree-linked template questions, including point manipulation, edge manipulation, and direction-oriented operations. Point Operation HDU 3966 #include <cstdio> #include <cstring> #include <iostream> #include <algorit

CC2530 Setting the Transmit power

[CSharp]View plain copy 1. Relation of the value and power of Mac_radio_tx_power_default [CSharp]View Plain Copy [CSharp]View Plain Copy MAC_RADIO_DEFS.C [CSharp] View Plain copy const uint8 code macradiodefstxpwrbare[] = &nb

Template parent function (Generate function)

What is a female function? I still consult the Baidu Encyclopedia. definition: for any sequence of a0,a1, the following method is associated with a function: ~g (x) = a0 + a1x + a2x^2 + a3x^3 +....+ anx^n is called G (x) is the generating func

Hibernate (9) Lazy loading problem solving solution

0 Lazy Load Concept ① lazy Load (load on demand) is a unique and powerful method of data acquisition, which means that the program defers access to the database, which ensures that sometimes unnecessary access to the database, because access to the

High concurrency system current limit stunt 2

In the previous article, "High concurrency system limited-current stunt", the current limit algorithm, application-level current limit, and distributed current limit are introduced in this paper. The Access layer current limit implementation is descr

JPA primary key generator and primary key generation policy

When you create an entity in JPA, you declare the primary key of the entity and its primary key generation policy. We have an entity class called email, whose primary key is declared as follows: @Id @Column (name = "email_id") @GeneratedValue (strat

COCOS2DX, after the sprite loads the image, changes the sprite size by zooming

Create a sprite based on the picture: Auto Sprite_back = sprite::create ("Login_background.png"); The wizard that loads the image directly calls the method Setcontentsize () does not work, the picture is still much larger. So the only thing that c

Penetration Testing Tutorial (Basic)-2

Two. Kali Introduction 92.1 Kali Linux features 102.2 Download Kali Linux 112.2.1 Package the latest Kali ISO 112.2.2 Official Kali Linux Mirror Image 112.3 Making Custom Kali mirror image 122.3.1 Ready to start 122.3.2 Package kali ISO configuration

Soap and AXIS2 Introductory tutorial (with instance)

Recent projects need to use soap and AXIS2 knowledge, in addition to learning, the first day to learn the content of a bit, as a note to do a record, and secondly if there is a need, can be used as a reference, today is mainly completed a bit of func

CP Target is not a directory

"Target is not a directory" is a CP error. It happens when you had three or more arguments, and the last argument was an existing filesystem object that isn ' t a dire ctory! Of course CP a B Works if B is a regular file, and not a directory. b is

Statistical Learning Method Study Note one

Chapter I. Introduction to Statistical learning methods the main characteristic of statistical learning is (1) The Platform--------Computer and network, is based on computers and networks, (2) The research object--------data, is a

Why do computers use binary instead of octal or hexadecimal

Electronic computers can process information and processing at very high speeds, including data processing and processing, and have a great capacity for storing data. Data in the computer in the physical state of the device, using a binary digital sy

Various strange padding values in the heap memory

Various strange padding values in the "Go" heap memory various strange padding values in the heap memory 2012-6-27 Finishing Cswuyg A few days ago encountered a wonderful code, with 0xFEEEFEEE to determine whether it is a dangling pointer, this must

Some questions about the Luci <一>

Recently, due to the project's reasons, now summarizes several points: The process of 1.LUCI operation. For: First, we start with the/www/cgi-bin/file and run the code in the Luci file: #!/usr/bin/lua luci.dispatcher.indexcache = "Tmp.luci-indexcach

as3.0 real solve the problem of loading GB2312 encoding garbled source code example

Turn from: thanks ... Please write AS3 load GB2312 encoded text, how to really solve the garbled problem.In AS3, System.usecodepage has no effect on the URL encoding and escape encoding f

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