search
HomeWeb Front-endHTML TutorialUnderstand why HTTP status codes are different

Understand why HTTP status codes are different

Understand why HTTP status codes are different

HTTP (Hypertext Transfer Protocol) is one of the most commonly used protocols in the Internet, used between clients and Transfer data between servers. In every HTTP response, a status code is included to inform the client of the processing status of the request. HTTP status codes consist of three digits and are divided into five categories: informational status codes, success status codes, redirection status codes, client error status codes, and server error status codes.

Understanding HTTP status codes can help developers identify and solve problems related to server communication. Different status codes represent different meanings and processing methods. The reasons for the differences in HTTP status codes will be explained in detail below.

  1. 1xx - Informational Status Code: The
    1xx status code indicates that the request has been received and processing is continuing. The most common is 100 (continue), which is used after the client sends the request and the server notifies the body to continue sending the request. Informational status codes are mainly used in HTTP long connections so that the server can notify the client of the progress of the request.
  2. 2xx - Success status code: The
    2xx status code indicates that the request has been successfully processed. The most common is 200 (Success), which indicates that the server successfully processed the request. Other common 2xx status codes include 201 (Created), which indicates that the request was successful and a new resource was created on the server; and 204 (No Content), which indicates that the server successfully processed the request but returned no content.
  3. 3xx - Redirect status code: The
    3xx status code indicates that further action is required to complete the request. The most common ones are 301 (Permanent Redirect) and 302 (Temporary Redirect), which are used to tell the client that the requested resource has been moved to a new URL, either permanently or temporarily. Other common 3xx status codes include 303 (see elsewhere), which tells the client that another URL should be requested using the GET method, and slightly different 301 or 302.
  4. 4xx-Client error status code:
    4xx status code indicates that the client's request has an error. The most common is 400 (Bad Request), which occurs when the server cannot handle the request's syntax or parameter errors. Other common 4xx status codes include 403 (Forbidden), which means the server denied the request; 404 (Not Found), which means the server cannot find the requested resource; and 429 (Too Many Requests), which means the client is requesting too frequently.
  5. 5xx-Server error status code: The
    5xx status code indicates that an error occurred while the server was processing the request. The most common is 500 (Internal Server Error), which means the server encountered an unexpected condition while processing the request. Other common 5xx status codes include 503 (Service Unavailable), which indicates that the server is temporarily unable to process the request; and 504 (Gateway Timeout), which indicates that the server is acting as a gateway or proxy but was unable to receive a timely response to the request from the upstream server.

The differences in HTTP status codes stem from differences in their purpose and usage. The informational status code is used to indicate the progress of the request, the success status code is used to indicate that the request was successfully processed, the redirection status code is used to indicate that the request requires further action, and the client error status code is used to indicate that the client request is incorrect and the server Error status codes are used to indicate that an error occurred while the server was processing the request.

Understanding the meaning and usage of HTTP status codes can help developers identify and solve problems related to server communication. When we use the HTTP protocol for development and debugging, we can judge the processing of the request based on the status code received, so as to better optimize and adjust our code.

To summarize, the purpose of HTTP status codes is to allow the server and client to communicate with each other and understand the processing of the request. Each status code has its own specific meaning and purpose, and developers need to understand how these status codes differ to be able to quickly identify and resolve issues related to server communication. By having a deep understanding of HTTP status codes, we can better optimize and adjust our code and improve overall development efficiency.

The above is the detailed content of Understand why HTTP status codes are different. For more information, please follow other related articles on the PHP Chinese website!

Statement
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Beyond HTML: Essential Technologies for Web DevelopmentBeyond HTML: Essential Technologies for Web DevelopmentApr 26, 2025 am 12:04 AM

To build a website with powerful functions and good user experience, HTML alone is not enough. The following technology is also required: JavaScript gives web page dynamic and interactiveness, and real-time changes are achieved by operating DOM. CSS is responsible for the style and layout of the web page to improve aesthetics and user experience. Modern frameworks and libraries such as React, Vue.js and Angular improve development efficiency and code organization structure.

What are boolean attributes in HTML? Give some examples.What are boolean attributes in HTML? Give some examples.Apr 25, 2025 am 12:01 AM

Boolean attributes are special attributes in HTML that are activated without a value. 1. The Boolean attribute controls the behavior of the element by whether it exists or not, such as disabled disable the input box. 2.Their working principle is to change element behavior according to the existence of attributes when the browser parses. 3. The basic usage is to directly add attributes, and the advanced usage can be dynamically controlled through JavaScript. 4. Common mistakes are mistakenly thinking that values ​​need to be set, and the correct writing method should be concise. 5. The best practice is to keep the code concise and use Boolean properties reasonably to optimize web page performance and user experience.

How can you validate your HTML code?How can you validate your HTML code?Apr 24, 2025 am 12:04 AM

HTML code can be cleaner with online validators, integrated tools and automated processes. 1) Use W3CMarkupValidationService to verify HTML code online. 2) Install and configure HTMLHint extension in VisualStudioCode for real-time verification. 3) Use HTMLTidy to automatically verify and clean HTML files in the construction process.

HTML vs. CSS and JavaScript: Comparing Web TechnologiesHTML vs. CSS and JavaScript: Comparing Web TechnologiesApr 23, 2025 am 12:05 AM

HTML, CSS and JavaScript are the core technologies for building modern web pages: 1. HTML defines the web page structure, 2. CSS is responsible for the appearance of the web page, 3. JavaScript provides web page dynamics and interactivity, and they work together to create a website with a good user experience.

HTML as a Markup Language: Its Function and PurposeHTML as a Markup Language: Its Function and PurposeApr 22, 2025 am 12:02 AM

The function of HTML is to define the structure and content of a web page, and its purpose is to provide a standardized way to display information. 1) HTML organizes various parts of the web page through tags and attributes, such as titles and paragraphs. 2) It supports the separation of content and performance and improves maintenance efficiency. 3) HTML is extensible, allowing custom tags to enhance SEO.

The Future of HTML, CSS, and JavaScript: Web Development TrendsThe Future of HTML, CSS, and JavaScript: Web Development TrendsApr 19, 2025 am 12:02 AM

The future trends of HTML are semantics and web components, the future trends of CSS are CSS-in-JS and CSSHoudini, and the future trends of JavaScript are WebAssembly and Serverless. 1. HTML semantics improve accessibility and SEO effects, and Web components improve development efficiency, but attention should be paid to browser compatibility. 2. CSS-in-JS enhances style management flexibility but may increase file size. CSSHoudini allows direct operation of CSS rendering. 3.WebAssembly optimizes browser application performance but has a steep learning curve, and Serverless simplifies development but requires optimization of cold start problems.

HTML: The Structure, CSS: The Style, JavaScript: The BehaviorHTML: The Structure, CSS: The Style, JavaScript: The BehaviorApr 18, 2025 am 12:09 AM

The roles of HTML, CSS and JavaScript in web development are: 1. HTML defines the web page structure, 2. CSS controls the web page style, and 3. JavaScript adds dynamic behavior. Together, they build the framework, aesthetics and interactivity of modern websites.

The Future of HTML: Evolution and Trends in Web DesignThe Future of HTML: Evolution and Trends in Web DesignApr 17, 2025 am 12:12 AM

The future of HTML is full of infinite possibilities. 1) New features and standards will include more semantic tags and the popularity of WebComponents. 2) The web design trend will continue to develop towards responsive and accessible design. 3) Performance optimization will improve the user experience through responsive image loading and lazy loading technologies.

See all articles

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

WebStorm Mac version

WebStorm Mac version

Useful JavaScript development tools

mPDF

mPDF

mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),

EditPlus Chinese cracked version

EditPlus Chinese cracked version

Small size, syntax highlighting, does not support code prompt function

DVWA

DVWA

Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software

SublimeText3 English version

SublimeText3 English version

Recommended: Win version, supports code prompts!