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1, What is CORS? For security reasons, the browser restricts cross domain HTTP requests initiated by scripts unless the server agrees to access. For example, if the server's response Header to the pre check request contains access control allow origin: *, the cross domain request can be accessed correctly. 2, Examples of hazards If the mal ...

5, ContentProvider related ContentProvider: content provider is responsible for data access. It is often used for APP data sharing, cross process data access, etc... for example, reading photo albums and contacts are implemented by ContentProvider **1. * * we want to access other applications in our own applications, or some data expo ...

socket programming and tcp Since tcp/ip protocols are encapsulated on the bottom layer of the operating system, in order to avoid the application layer directly calling the methods of the operating system, the operating system provides a socket interface, which is called by the application layer. The socket interface is divided into tcpSocket ...

HTTP protocol 1. What is the HTTP protocol What is an agreement Agreement refers to the rules agreed by both parties or multiple parties and everyone should abide by The so-called HTTP protocol refers to the rules that the data sent needs to comply with when communicating between the client and the server The data in HTTP protocol is ...

brief introduction In the last article, we mentioned how to configure TLS in netty to support http2. In fact, TLS is not a mandatory requirement of https. It is just a recommended standard. In addition to TLS, how do I set up netty to support http2? Let's have a look. Basic process netty supports http2 in two cases. The first case is to use ...

ContextType(MIME) ContextType is a field in which MIME (Multipurpose Internet Mail Extensions) represents the type of information transmitted over HTTP. Different contexttypes represent different types. There are some commonly used contexttypes. The syntax of MIME type is type/subtype, which is in IETF RFC 6838 The syntax is composed of t ...

brief introduction JSON is a very popular data exchange format. Each programming language has many libraries for operating JSON, including standard libraries and third-party libraries. The standard library in Go language has built-in JSON operation library encoding/json. We have also introduced it before, which is specifically used for query & ...

1.Servlet Server applet: a small program running on the server side public class ServletDemo implements Servlet { @Override public void init(ServletConfig servletConfig) throws ServletException { } @Override public ServletConfig getServletConfig() { return null; } @Override public void servic ...

When learning socket communication in Java, the teacher assigned an assignment and took this opportunity to sort out the relevant knowledge. The topics are as follows: Write client-server program and use Socket technology to realize communication. Both parties agree that the communication port is 6789. Server side function: after receiving the ...

What is the relationship between HTTPS and HTTP? What is the HTTPS encryption process? How to integrate SSL in Websocket project? How Alibaba cloud develops HTTPS. An overview of HTTP and HTTPS 1.1 HTTP protocol summary The first version of HTTP can only transfer hypertext markup language (HTML) files, so it is called hypertext transfer pro ...