apn protocol

ICMP Internet Control Message Protocolis generally considered an integral part of the IP layer and is generally used by the IP layer or higher (TCP, UDP).The ICMP message is transmitted inside the IP datagram.The format of the ICMP message is as follows:The first 4 bytes of the message are the same: 8bit type, 8bit code, 16bit test and.The ICMP packets have different message types, and the different types are determined by the 8bit type and the 8bit code together. There may be more than one code

(unencrypted) as strings in base64 format.Network eavesdroppers can easily read data. Use Basic verification only for security purposes. For example, if you do not need to protect your creden, or bind an HTTP network encryption protocol (such as SSL ),. 3.2 digest Verification You also need to provide account information in the Login Dialog Box displayed in the browser. But the difference is that,Hash string used to verify the password passed b

@protocol MyProtocol @required//Declares what must be done, by default@required-(void) walk;-(void) speak;-(void) think; Think is not implemented in the class implementation warns!!!@optional-(void) sing;-(void) laugh;@endA protocol can declare a large stack of methods, but cannot declare member variables;Two agreements can not inherit, but the agreement may abide by another agreement;Subclasses can abide

This is an http-based resumable data transfer protocol, mainly using different httpmethods and related custom headers to implement the resumable data transfer function.Specific methods and headers:1. HEADThe head request is used to obtain the status of the uploaded file. The server returns the range of the files that have been written and those that have not been written.(PS, I just found that the Protocol

protocol [' pr?ut?k?l] (example:http://blog.sina.com.cn/s/blog_6aafe9c90100yozz.html )I. Descriptiontwo classes for communication, with the protocol is more convenient. 1. The protocol declares a method that can be implemented by any class2. The protocol is not a class, it defines an interface that other objects can

HTTP is a stateless protocol, with two consecutive requests for the same session that are not known to each other, and they are parsed by the newly instantiated environment, which does not save any information about the session, except that the application itself may already be stored in the global object. own understanding, in the ASP: every time the page submission server does not have any relationship, each time the information recorded on the pag

We have analyzed some protocols and the content of the protocol stack. I believe everyone understands the content of the H.323 protocol. Here we will explain the development of this protocol stack. Developing an H.323 protocol stack is an extremely arduous task in the communication design process. The difficulty lies i

------Java Training, Android training, iOS training,. NET training, look forward to communicating with you! ------- Can be used to declare a whole bunch of methods (cannot declare member variables) As long as a class adheres to this protocol, it is equivalent to having all the method declarations in this agreement As long as the parent class adheres to a protocol, the subclass also adheres

Many of us know the IP protocol, that is, the Internet Protocol address. But it is also a datagram protocol. These basic structures are not clear to many friends. Next we will introduce the basic structure of this datagram. Internet Protocol IP) Internet protocol is a datagr

Gateway-Gateway Protocol (GGP) To Route packets correctly and efficiently, the core gateway needs to know the situation of other parts of the Internet, including routing information and subnet characteristics. This type of information is usually used when a gateway processes heavy loads and is the only way to access the subnet, other gateways in the network can cut traffic to reduce the load on the gateway. GGP is mainly used to exchange routing infor

Transferred from: Http://bbs.ednchina.com/BLOG_ARTICLE_172024.HTM2.4-Block Transport protocol T=1In the T=1 protocol, commands, R-APDU, and Transmission control information (such as acknowledgment information) transmitted between the TAL and IC cards are made up of blocks.The following defines the block frame structure of the data link layer, special options for the Pro