What are the URL specifications?

The reason for the error is NameResolutionError(self.host,self,e)frome, which is an exception type in the urllib3 library. The reason for this error is that DNS resolution failed, that is, the host name or IP address attempted to be resolved cannot be found. This may be caused by the entered URL address being incorrect or the DNS server being temporarily unavailable. How to solve this error There may be several ways to solve this error: Check whether the entered URL address is correct and make sure it is accessible Make sure the DNS server is available, you can try using the "ping" command on the command line to test whether the DNS server is available Try accessing the website using the IP address instead of the hostname if behind a proxy

Vue3+TS+Vite development skills: How to perform SEO optimization SEO (SearchEngineOptimization) refers to optimizing the structure, content and keywords of the website to rank it higher in search engines, thereby increasing the website's traffic and exposure. . In the development of modern front-end technologies such as Vue3+TS+Vite, how to optimize SEO is a very important issue. This article will introduce some Vue3+TS+Vite development techniques and methods to help

PHP function introduction—get_headers(): Overview of obtaining the response header information of the URL: In PHP development, we often need to obtain the response header information of the web page or remote resource. The PHP function get_headers() can easily obtain the response header information of the target URL and return it in the form of an array. This article will introduce the usage of get_headers() function and provide some related code examples. Usage of get_headers() function: get_header

Differences: 1. Different definitions, url is a uniform resource locator, and html is a hypertext markup language; 2. There can be many urls in an html, but only one html page can exist in a url; 3. html refers to is a web page, and url refers to the website address.

Summary of Vue development experience: Practice in solving SEO and search engine optimization In the current era of rapid development of mobile Internet and Web technology, search engines are still one of the most important ways to obtain information on the Internet. For websites that need to gain high exposure in search engines, SEO (SearchEngineOptimization) is an essential task. So, for web development projects using Vue technology, how to achieve SEO and search engine optimization? Vue

The difference between SEO and SEM is 1. SEO refers to search engine optimization, while SEM refers to search engine marketing; 2. SEO optimizes the visibility of the website so that it naturally ranks in front of organic search results, while SEM uses advertising to Paid ranking at the top of search results; 3. SEO is a long-term strategy, which requires continuous and sustained efforts to maintain the website's ranking in search engines, while SEM can be flexibly adjusted and implemented, and it can quickly adjust the advertising strategy as needed. and budget.

SSR technology application practice in Vue3 to improve the SEO effect of applications. With the rapid development of front-end development, SPA (Single Page Application) has become mainstream. The benefits of SPA are self-evident and can provide a smooth user experience, but there are some challenges in terms of SEO (search engine optimization). Since SPA only returns an HTML template in the front-end rendering stage, most of the content is dynamically loaded through JavaScript, causing search engines to have difficulties in crawling, indexing, and ranking. To solve this problem,

Scrapy is a powerful Python crawler framework that can be used to obtain large amounts of data from the Internet. However, when developing Scrapy, we often encounter the problem of crawling duplicate URLs, which wastes a lot of time and resources and affects efficiency. This article will introduce some Scrapy optimization techniques to reduce the crawling of duplicate URLs and improve the efficiency of Scrapy crawlers. 1. Use the start_urls and allowed_domains attributes in the Scrapy crawler to