Ultra-long text message: if the text message contains more than 70 Chinese characters, it must be divided into multiple text messages when submitted to the gateway, but one text message is sent by the user's mobile phone (SP-angle, the concept of
SIP Message Type and Message format
SIP is a text-based protocol that uses the UTF-8 character set.
There are two main types of SIP messages:
One is the request sent from the client to the server );
One is the response message sent from the server
1. TCP Header (image source)
2.
(1) Source Port and destination port
Each occupies 2 bytes, and the 16-bit port number is added with the 32-bit IP address.
(2) serial number
4 bytes. The serial number range is [0, 2 ^ 32-1]. There are 2 ^ 32 (that
TCP protocol specifies a common method for reliable data stream transmission between different hosts, such as connection establishment and release, message number, confirmation after receiving the datagram, traffic control, and sending timeout. I
The introduction of WCF integrates. Net remoting, WebService, and so on. It simplifies the communication development on the Microsoft platform and is expected to be the integration direction of the communication processing on the Microsoft platform.
Flex is the front-end interface technology, and the backend and database interaction or large computing still need to rely on Java,. net, PHP, Ruby and other languages. As early as flash 8, Adobe proposed the AMF (Action Message format) technology
Description of fixed-length packets
Fixed-length packets are the most widely used and simple message formats. It is easy to understand, but fixed-length packets also have their own limitations. The biggest problem is that if the length of the
HTTP messages are text-oriented, and each field in the message is a number of ASCII strings, and the length of each field is indeterminate. HTTP has two types of messages: Request messages and response messages.Request messageAn HTTP request message
Each IP datagram starts with an IP header. The TCP/IP software of the source computer constructs this header, and the destination computer's TCP/IP software leverages the information processing data encapsulated in the IP header. The IP header
HTTP Request message Format:The HTTP request message consists of a request line, a request header, and a 3 part of the request body.1, Request lineConsists of 3 parts: The request method, the URL (see note 1), and the protocol version, separated by
HTTP messages are text-oriented, and each field in the message is a number of ASCII strings, and the length of each field is indeterminate. HTTP has two types of messages: Request messages and response messages.Request messageAn HTTP request message
These days to complete a comparison of the Ethernet frame of the program (c), the teacher gave the Ethernet frame head and IP packet header structure, and the actual fetch to the packet format is the same.Data structure of Ethernet frame head:struct
The mail feature above uses the default message content, which does not look very intuitive and gives a common message content configurationModify content Type to HTML (text/html)
The default content configuration is posted here for
The previously expanded Ant-jmeter supports the HTML file format for message attachments as well as for message content.Because the content format of the message is detailed information, that is, the intuitive display is case, but because of the
1, UDP has two fields: Data field and Header field. The first field header field is simple, only 8 bytes, consisting of 4 fields, each with a length of two bytes.
1 Source ports: Source port number. Choose when you need a reply from your partner.
Five SNMP protocol data units
SNMP specifies five protocol data units PDU (that is, SNMP Packets) for exchange between management processes and proxies.
Ø
Get-Request: extract one or more parameter values from the Agent process (sent by the
In the past two days, I have studied webabcd's socket multi-person chat room and want to add some features, such as allowing users to send pictures or files in addition to text.
Problem:
When sending data through a socket, only byte [] Arrays
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