CLASS.COURSERA.ORG 网站分析

访问网站 class.coursera.org 时发生错误

我们在尝试访问网站 class.coursera.org 的以下 URL 地址时遇到错误:

HTTP 403 是一个 HTTP 状态码,表示禁止访问请求的资源。当服务器限制我们的机器人访问页面时,就会发生这种情况,通常是由于防火墙的存在。

以下内容展示了我们服务器在 2024-05-06 缓存的部分历史分析数据。由于我们的机器人无法访问此网站,数据可能不完整或已过时,仅供您参考。

基本信息

网站标题:
服务器:
AmazonS3

搜索引擎收录信息

必应:
谷歌:

页面信息

标题:
Coursera
长度: 8 字符; 最佳长度: 10 ~ 60 字符

HTML 标题标签是页面 SEO 最重要的元素之一,出现在搜索结果、浏览器选项卡和书签中。

您的标题标签似乎不符合理想长度。

Google 的搜索结果会截断超过 60 个字符的标题;Bing 的搜索结果会截断超过 70 个字符的标题。

以下是元标题的最佳做法:

  • 标题长度保持在 10-60 个字符之间。
  • 使关键字/关键短语显而易见
  • 融入相关的有力词语
  • 清晰简洁
Meta 描述信息:
长度: 0 字符; 最佳长度: 50 ~ 160 字符

The length of your meta description seems to be outside the recommended range. Ideally, a META DESCRIPTION should be between 50 and 160 characters, including spaces.

A meta description tag serves as a concise and informative summary of a web page's content, aiming to engage and inform users about the page's topic.

Google relies on the actual content of the page to generate a snippet for search results, but it may also utilize the meta description for a more descriptive representation of the page.

Meta descriptions act as a compelling pitch to persuade users that the page aligns with their search intent. While there's no strict character limit, Google truncates the snippet in search results as necessary to fit the device's width.

Best practices for Meta Descriptions

  • Length: Maintain a description length of 50-160 characters to ensure optimal visibility in search results.
  • Uniqueness: Craft unique descriptions for each page on your website to differentiate their purposes and content.
  • Accuracy: Create descriptions that precisely depict the specific content and purpose of the page.
  • Keywords: Ensure that each web page has a unique meta description containing important keywords relevant to the page's content.
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:
This page is no longer available.
长度: 33 字符; 最佳长度: 10 ~ 255 字符

建站技术

服务器:
AmazonS3
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 class.coursera.org 的 HTTP header 信息:
HTTP/1.1 403 Forbidden
Access-Control-Allow-Methods: GET
Access-Control-Allow-Origin: *
Cache-Control: private, no-cache, no-store, must-revalidate, max-age=0
Content-Encoding: gzip
Content-Type: application/xml
Date: Mon, 06 May 2024 17:28:38 GMT
Server: AmazonS3
Set-Cookie: CSRF3-Token=1715880518.UwCEa1Ea2BR309Ex; Max-Age=864000; Expires=Thu, 16 May 2024 17:28:38 GMT; Path=/; Domain=.coursera.org
Set-Cookie: __204u=8797303037-1715016518121; Max-Age=31536000; Expires=Tue, 06 May 2025 17:28:38 GMT; Path=/; Domain=.coursera.org
Strict-Transport-Security: max-age=31536000; includeSubDomains; preload
Vary: Origin, Accept-Encoding
x-amz-id-2: OpitF9AMN7t13QAanYSb7PiK9tP94IKezzKMtckoDKDUXHiGf+C22o3iPedBNSjV1la9Z7YXZcg=
x-amz-request-id: 9Y3G35NFYN9YAEQC
X-Content-Type-Options: nosniff
X-Coursera-Request-Id: Evg28gvOEe-0CRIUq_J-hQ
X-Coursera-Trace-Id-Hex: c49d88ecb9a44960
X-Frame-Options: SAMEORIGIN
X-XSS-Protection: 1; mode=block
transfer-encoding: chunked
Connection: keep-alive

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。coursera.org 当前共有 46 项 DNS 记录。
主机 类型 IP/目标 生存时间 扩充信息
coursera.orgA60
coursera.orgA60
coursera.orgA60
coursera.orgA60
coursera.orgNS12546
coursera.orgNS12546
coursera.orgNS12546
coursera.orgNS12546
coursera.orgSOA900expire: 1209600
serial: 1
coursera.orgMX137pri: 10
coursera.orgMX137pri: 20
coursera.orgMX137pri: 20
coursera.orgMX137pri: 30
coursera.orgMX137pri: 30
coursera.orgMX137pri: 30
coursera.orgMX137pri: 30
coursera.orgTXT
376174617-10056694
60
coursera.orgTXT
BthfBdp8W7Bqmm87eNGy
60
coursera.orgTXT
MS=ms91657421
60
coursera.orgTXT
apple-domain-verification=8gxy28dzSlSOYkUI
60
coursera.orgTXT
atlassian-domain-verification=OwoxnU5JeeEeNB3PXqTmPOsZNFUYTd05tar4PX8ZNNjps+mMWto+OyyA/50W5+B1
60
coursera.orgTXT
atlassian-domain-verification=pwnyCbGEmC6E08lYJGO/SYkQvbjFS+OXy03eVMG75U52Edj0vbZGBjdaorxh+PUE
60
coursera.orgTXT
cisco-ci-domain-verification=5b418d2526e560d4ec96988886c86e7930c6936b68215183295356a4e4bf36d7
60
coursera.orgTXT
docker-verification=6792a290-383f-4d78-9f9b-71f46df7b6b2
60
coursera.orgTXT
docusign=05d7ee1b-a029-4b94-912a-25bb3c4a2bed
60
coursera.orgTXT
facebook-domain-verification=46dep9ql4m6it0wahwkhiou7xit57h
60
coursera.orgTXT
google-site-verification=61uiBFuqY-MYJHWt_8qbU00Rsn7Nq_njU5eMUG0NlrY
60
coursera.orgTXT
google-site-verification=874wxzrE4FAJO81XTCXyH6WYnWZAMdlbMRXI3lfI0bw
60
coursera.orgTXT
google-site-verification=BbSjFsQN-aTkQDOiar6q3O4fPzSlgepoOdM3fMuCXFA
60
coursera.orgTXT
google-site-verification=H2oN7Mv4QCzOClwXz1j30f-4544byEDxyEk0o3eluE0
60
coursera.orgTXT
google-site-verification=PDgfi1HUgagq2NZOh86B3PpGnjDyNXdUr9iyWzDjONM
60
coursera.orgTXT
google-site-verification=UGpuPtZLCcMKFmgAeN4q6EbvxJn56A8Jz0sgW3yVKmA
60
coursera.orgTXT
google-site-verification=fFsckLsIOub_171zkeWLBQ72SvjwGSPsz209wwTtmX4
60
coursera.orgTXT
google-site-verification=l-IugqqOHDGlHpUHfv3e6z8J1koLgfGSem04lqBA_B8
60
coursera.orgTXT
google-site-verification=nLfEbuY6OaO0lfas7ywHqpPnOMnobNONSJ0hnbJO9co
60
coursera.orgTXT
google-site-verification=tbpsWy5oBEvo-Kod36Lqsb3qRK0h_divcCGAeUdVZlk
60
coursera.orgTXT
hubspot-domain-verification=ZTM1ZDk4NGEtNWU5Ny00NDJiLWIwNTQtZTA1NGJhZmU3MzZh
60
coursera.orgTXT
miro-verification=d5e807f40d602cde4051496eaaa95234e158ada0
60
coursera.orgTXT
onetrust-domain-verification=bc353cda9f49402e8b2ac8a3b3e86286
60
coursera.orgTXT
spf2.0/pra include:amazonses.com include:sendgrid.net include:_spf.google.com include:spf.mtasv.net -all
60
coursera.orgTXT
stripe-verification=0f6967e13ea84d76953d1c3f2dc9eb80e82f090fff99161cd2fa957f55a71d60
60
coursera.orgTXT
stripe-verification=34fd6b74183c244d59d572c162e5b77fe6eed5e5205296151f49dda7b68670eb
60
coursera.orgTXT
stripe-verification=95449f6ae01b02ef7f65b59ee2f3ed14bac52c49aaa1519e57b864b70baede3a
60
coursera.orgTXT
v=spf1 include:sendgrid.net ip4:24.6.102.21 ip4:50.16.53.44 include:_spf.google.com include:amazonses.com include:spf.mtasv.net include:_spf.salesforce.com -all
60
coursera.orgTXT
yandex-verification: 7472d03e746e191a
60
coursera.orgTXT
zoom-domain-verification=6fb6c268-238e-477b-ba40-2f0164695cd7
60