1. Overview
Some websites will go down after the server has been running for a period of time. There are many reasons that may cause this phenomenon: such as insufficient tomcat heap and non-heap memory settings,
the program fails to release memory space and causes memory overflow, or a certain Some processes have been running and cannot be released, causing a large consumption of cup resources.
But in addition to the program itself, it may also be caused by client access (of course, this client also includes search engines such as spider software).
If the server and client establish a long link (you can use "netstat -a" command to view network access information), which requires certain settings for the connection of the http response header
.
In http1.1, a connection header field may appear in both the request and response headers. The meaning of this header is how to handle long links when the client
communicates with the server.
In http1.1, the client and server support long links by default. If the client uses the http1.1 protocol but does not want to use
long links, you need to specify the value of connection in the header as close; if the server If the party does not want to support long links, it is also necessary to clearly state that the value of the connection is close in the response. Whether the header of the request or the response contains a connection with a value of close, it indicates that the TCP link currently being used is being processed by the request. It will be disconnected after completion. In the future, the client must create a new tcp link when making a new request.
The close setting of HTTP Connection allows either the client or the server to close the underlying connection. Both parties will require
to close their TCP connections after processing the request.
2. Example
Connection:Keep-Alive
Connection:Close
The above has introduced PHP knowledge point 3-HTTP header-Connection, including the relevant content. I hope it will be helpful to friends who are interested in PHP tutorials.

What’s still popular is the ease of use, flexibility and a strong ecosystem. 1) Ease of use and simple syntax make it the first choice for beginners. 2) Closely integrated with web development, excellent interaction with HTTP requests and database. 3) The huge ecosystem provides a wealth of tools and libraries. 4) Active community and open source nature adapts them to new needs and technology trends.

PHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.


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