WWW.COMPUTER-PDF.COM 网站分析

搜索引擎收录信息

必应:
谷歌:

页面信息

标题:
Free Computer Science Courses: Learn Online
长度: 43 字符; 最佳长度: 10 ~ 60 字符
Meta 描述信息:
Download 1000+ free computer PDFs - coding tutorials, cybersecurity guides, and IT certifications. Learn programming, networking, and tech skills instantly.
长度: 156 字符; 最佳长度: 50 ~ 160 字符
Meta 关键词:
长度: 0 字符; 最佳长度: 10 ~ 255 字符

The length of your meta keywords seems to be outside the recommended range. Ideally, a meta keywords should be between 10 and 255 characters, including spaces.

Meta keywords are a specific type of meta tag that appear in the HTML code of a web page. They provide information to search engines about the topic of the page. Meta keywords were once used to help rank web pages in search engine results. However, due to the abuse by webmasters and marketers, Google claims to have stopped using them more than a decade ago. Despite this, there are still reasons to consider using meta keywords:

  • Uncertain Impact on Google's Algorithm: While Google devalued meta keywords, it is uncertain if they were entirely removed from its ranking algorithm. Google keeps its ranking algorithms top secret to deter people from gaming the system.
  • Other Search Engines and CMS: Other search engines like Yandex, Baidu, and Naver may still use meta keywords. Additionally, some internal CMS search systems, such as SOLR and Algolia, also utilize the meta keywords tag.

Best practices for Meta Keywords

  • Relevance is Key: It is crucial to choose keywords that accurately reflect the content of your page.
  • Keep it Limited: It is generally recommended not to exceed more than 10 meta keywords for a single page. Also, the content length should not exceed 255 characters (including spaces).
  • Consider Long-Tail Keywords: Long-tail keywords are more specific and longer phrases that target a niche audience. These keywords can be highly effective in driving targeted traffic to your website.

Remember, meta keywords are just one aspect of search engine optimization (SEO), and search engines now place less emphasis on them compared to other factors. However, by following these best practices, you can still optimize your meta keywords effectively and improve the visibility of your web pages.

H1标签:
Learn Computer Science for Free and Develop Your Skills
长度: 55 字符; 最佳长度: 10 ~ 255 字符

建站技术

服务器:
cloudflare
SSL 安全:
有效
robots.txt:
不可用
XML 站点地图:
不可用
Gzip 压缩:
有效
favicon.ico:
不可用

HTTP Head 分析

HTTP 协议采用了请求与响应模型,通过 HTTP Header 定义了 HTTP 传输过程中的必要参数。 浏览器(例如 Internet Explorer, Google Chrome, Firefox 等)并不会显示 HTTP header 字段的内容,下面是网站 www.computer-pdf.com 的 HTTP header 信息:
HTTP/1.1 200 OK
Date: Wed, 18 Jun 2025 21:34:09 GMT
Content-Type: text/html; charset=UTF-8
Transfer-Encoding: chunked
Connection: keep-alive
Server: cloudflare
Cache-Control: no-cache, private
Nel: {"report_to":"cf-nel","success_fraction":0.0,"max_age":604800}
X-Frame-Options: DENY
X-Content-Type-Options: nosniff
Strict-Transport-Security: max-age=31536000; includeSubDomains
Cf-Cache-Status: DYNAMIC
Report-To: {"group":"cf-nel","max_age":604800,"endpoints":[{"url":"https://a.nel.cloudflare.com/report/v4?s=5%2BGWXbUMUa8s3x0BcFfaGb9vsjxv0pBQKtzKrQqMeYFc4doGtsJoZkB5xoMTtdrwoKbff1I5flt0Kd2VfwEvNsfMT4EuGuoIQKIARfM4P1ckoeGNAgWWARPYPPZMtWfG"}]}
Content-Encoding: gzip
Set-Cookie: XSRF-TOKEN=eyJpdiI6ImxYc29EZXVYWW83ZUU0dVkwVFpuSnc9PSIsInZhbHVlIjoiM3Z2VE1iR0pHSWYyNWtXT1d1amN3S0FCbWZNVXdocGo1MlpWT2cwcGhJZWk1eWdEYjhZTWxrbnpFK2FcL1hOT0IiLCJtYWMiOiIxZGFkNmM2ZDgwZTE0NzQ5NWNkZGFjZjFlMWIyYWViZWJkMWZhOGQ2ZGVjZTY2YTcxZWE2YmRjNjYzOGI3ZTVhIn0%3D; Path=/; Max-Age=7200; Expires=Wed, 18 Jun 2025 23:34:09 GMT
Set-Cookie: computerpdf_session=eyJpdiI6IlQxa1U4em02bm1HeW1yWmplNTY4SHc9PSIsInZhbHVlIjoidzllRFJ2YmpZK1RsWVh3NnN1b3BiTmlLQmJYcFoyTVJ6ZGtuSXFsU0R6N1BwUjQzanY0SFJRclFTVmtqanlXTFg3enlnd0kwSWJYYmZxUHl2RGlZVU1vUmQ5bjBFbHpNUlwvV0M5RGo3ZGYwc1c4THhFdERiYjJQbFlvbXhBTkpxIiwibWFjIjoiODk3ZjUzMDI4NzA0ZWY4MmI0OTNhNjk3YjA0ZGE3ZjEyYWI5OTQxZWYzNmIwODUwYmJkMjMwOTE4ZTljNTg4ZCJ9; HttpOnly; Path=/; Max-Age=7200; Expires=Wed, 18 Jun 2025 23:34:09 GMT
CF-RAY: 951de8bbaee18cc8-EWR
alt-svc: h3=":443"; ma=86400

DNS 记录分析

DNS 域名系统(Domain Name System,缩写)是 Internet 的一项基础服务。它作为将域名和IP地址相互映射的一个分布式数据库,能够使人更方便地访问互联网。computer-pdf.com 当前共有 14 项 DNS 记录。
主机 类型 IP/目标 生存时间 扩充信息
computer-pdf.comA300
computer-pdf.comA300
computer-pdf.comNS21600
computer-pdf.comNS21600
computer-pdf.comSOA1800expire: 604800
serial: 2372536096
computer-pdf.comMX300pri: 20
computer-pdf.comMX300pri: 50
computer-pdf.comMX300pri: 10
computer-pdf.comTXT
google-site-verification=Wiw5WPls9LI-wFBIw9VIaozyeH5JclK2bH2k-b1e0_g
300
computer-pdf.comTXT
v=spf1 include:zoho.com ip4:3.12.172.161 ~all
300
computer-pdf.comTXT
google-site-verification=UFRnDsWsf0rgVQMICxOzd4hf-giPLYzfkcd9adFwnpo
300
computer-pdf.comTXT
google-site-verification=Q5IjODpkYSBUIVz_-VC4t3r8nddpSGEle9EJtcTniK4
300
computer-pdf.comAAAA
2606:4700:3037::ac43:c176
300
computer-pdf.comAAAA
2606:4700:3035::6815:49f2
300