Editing Web Ping

[[Test connectivity for the web service]]: 網站監測與網站連線測試，當網站臨時無法連線時，可以檢查是否是個別 ISP 或 網路環境造成的網路連線問題。  (Back to [[Network problem]])

== 網站連線測試 ==
=== 網站連線測試 ===
==== 同時從世界各處測試網站連線 手動執行監測 ====
可以檢查是否是個別 ISP / 網路環境造成的網路連線問題: 如果只有你不能連線，世界其他人都可以連線，請更換網路連線 IP ，例如更改無線網路重新連線網站。
* {{Gd}} [http://www.freespeedtest.com/ Free Speed Test for Internet Access and Website Speed : FreeSpeedTest.com] 從世界10處(含中國北京)進行連線速度測試 via [http://edblog.net/archives/661 測試你的網站在世界各地的連線速度 | 艾德的部落格天空]
** 含地圖; 相同公司的替代服務網站: InternetSupervision [http://internetsupervision.com/ Website Monitoring Services]

* {{Gd}} [http://downforeveryoneorjustme.com/ Down for everyone or just me?] 介面簡單好用，但未說明從何處進行連線測試 ([http://www.goston.net/2008/04/14/1219/ 介紹])

* [http://www.freesitestatus.com/zhtw/index.php FreeSiteStatus 網站監測、主機監測服務] 從世界10處，橫跨北美、歐洲、亞洲 (不含中國) 等處，進行連線測試。監測地點詳[http://www.freesitestatus.com/zhtw/network.php 監測網路]。 ([http://www.freesitestatus.com/quicktest.php?action=result&qtid=440478&r=9120 sample]) {{access | date=2017-03-29}}

* [http://www.alertra.com/ Alertra Web Site Monitoring] 
** (1)從世界13處(含中國上海、香港)進行連線速度測試 check from different citys: Los Angeles USA, Detroit USA, Frankfurt GERMANY and London UK. 。 
** (2) ''免費版未提供 2014-02-25'' 可查看網頁回應：輸入網頁網址，然後點選 Response ->  View Extended Data (Headers, content and more) 可以看到網頁內容，不過中文內容會亂碼。 另外提供 View Packet Capture (.cap file in pcap/Wireshark format)

* [http://host-tracker.com/ HostTracker - Website Uptime Monitoring Service] 從世界33處(不含中國)進行連線測試，並提供30天Email訂閱試用 ([http://flickr.com/photos/planetoid/2268903192/ 測試結果], 2007-09-24)

* [http://check-host.net/ Check server: Check host - online website monitoring, Check IP]
** 從世界18處(含中國香港)進行連線速度測試 {{access | date=2015-08-01}}

* [http://tools.pingdom.com/fpt/ Pingdom Tools: full page test]: 測試網頁載入時間(Full page test)，以及[http://tools.pingdom.com/ping/ Pingdom Tools: Ping and traceroute]則提供 Pingdom Tools網站到目標網站的連線檢查。

* [http://monitor.saycoo.com/en/quicktest.php Saycoo Website Monitoring: Quick Test Network Tools] 從USA, UK, Netherlands, Singapore, Australia等處(不含中國)進行連線測試, 僅會顯示是否ok, 不會顯示回應時間 (access: 20090227)

* [http://www.websitepulse.com/ WebSitePulse] -> 1. [http://www.websitepulse.com/help/tools.php Free Website Test]: Test from (1)Seattle, WA (2)Munich, Germany (3)Brisbane, Australia 2. 選擇 Web Page Test，可概略呈現地網頁元素下載的所需時間

* [http://monitority.com/ Monitority - FREE Website Monitoring (Alerts via Email, SMS, Twitter)] duration: 20 seconds, 1 minute ... {{access | date = 2015-08-24}}
** [http://monitority.com/about Features] claimed "Multiple geographic locations"

* [http://www.just-ping.com/ just ping]: Free online ping from 50 locations worldwide(includes China) {{exclaim}} 如果網站關閉 {{Acronym | acronym= ICMP | def= Internet Control Message Protocol}} 回應，會導致測試結果顯示為「Packets lost (100%)」，但是其實網站是可以連線的。{{access | date = 2013-05-13}}

* [https://dnschecker.org/ DNS Checker - DNS Check Propagation Tool] {{access | date=2019-02-02}}

* [https://www.uptrends.com/tools/uptime Website Availability Test - Uptrends] {{access | date=2020-03-11}}

* [https://community.spiceworks.com/tools/website-down-check/ Website Down Checker: Down for everyone or Just you?] {{access | date=2022-06-18}}

==== 同時從世界各處測試網站連線 固定頻率自動執行監測 ====
* {{Gd}} [https://uptimerobot.com/ Uptime Robot] 免費與付費版均有。主要從美國伺服器連線測試<ref>[https://uptimerobot.com/locations Locations and IPs | Uptime Robot]</ref>。免費版監控週期 5 分鐘、共 50 個監控規則的限制。 {{access | date=2022-07-14}}

* [http://www.alertra.com/ Alertra Web Site Monitoring] 
** (1)從世界13處(含中國上海、香港)進行連線速度測試 check from different citys: Los Angeles USA, Detroit USA, Frankfurt GERMANY and London UK. 。 
** (2) ''免費版未提供 2014-02-25'' 可查看網頁回應：輸入網頁網址，然後點選 Response ->  View Extended Data (Headers, content and more) 可以看到網頁內容，不過中文內容會亂碼。 另外提供 View Packet Capture (.cap file in pcap/Wireshark format)

* [http://jetpack.me/support/monitor/ Monitor — Jetpack for WordPress] 教學: [http://www.freegroup.org/2014/04/jetpack-monitor/ Jetpack Monitor 免費 24/7 網站監測服務，WordPress 無法連線自動發送提醒 (免費資源網路社群)]{{access | date=2014-04-05}}

* [https://pulsetic.com/ pulsetic] 免費與付費版均有。免費版監控週期 5 分鐘。無法設定要從世界哪一處進行連線測試。{{access | date=2022-04-08}}

* [http://www.jiankongbao.com/ 监控宝] 從中國、歐美[http://www.jiankongbao.com/monitor 等處]連線測試 {{access | date=2014-07-14}}

* [http://www.webkaka.com/ 卡卡網—在線網速測試|網速檢測|網站速度檢測|網站速度測試平台　www.webkaka.com]: 美國、澳大利亞、日本、法國、中國等地方測試。 教學: [http://www.freegroup.org/2009/08/webkaka/ 卡卡網 - 從中國大陸13個檢測點、美國、澳洲和日本測試網站速度 | 免費資源網路社群]

* [http://host-tracker.com/ HostTracker - Website Uptime Monitoring Service] 從世界33處(不含中國)進行連線測試，並提供30天Email訂閱試用 ([http://flickr.com/photos/planetoid/2268903192/ 測試結果], 2007-09-24)

* [http://www.websitepulse.com/ WebSitePulse] -> 1. [http://www.websitepulse.com/help/tools.php Free Website Test]: Test from (1)Seattle, WA (2)Munich, Germany (3)Brisbane, Australia 2. 選擇 Web Page Test，可概略呈現地網頁元素下載的所需時間

* [https://www.uptimedoctor.com/ Uptime Doctor] 免費與付費版均有。自北美、歐洲、亞洲等地方測試。 {{access | date=2017-05-31}}

* [https://www.statuscake.com/ StatusCake] 免費與付費版均有。自世界各處伺服器<ref>[https://www.statuscake.com/kb/knowledge-base/what-locations-do-you-have/ What Locations Do You Have | Knowledge Base]</ref>隨機一處測試。免費版監控週期 5 分鐘、共 10 個監控規則的限制<ref>[https://www.statuscake.com/pricing/ Our Pricing | Yearly Website Monitoring Pricing | StatusCake | StatusCake - Website Monitoring]</ref>。。教學: [https://free.com.tw/free-website-monitoring-statuscake/ StatusCake 免費網站監控服務，斷線自動以 Email、簡訊、Skype 通知用戶] {{access | date=2018-10-08}}

* ''$'' [https://onlineornot.com/ OnlineOrNot - Free Website and API Monitoring - OnlineOrNot]. Example of [https://hackernews.onlineornot.com/ Hacker News Status]

* 軟體 [http://visualroute.visualware.com/ VisualRoute traceroute server: trace IP address, trace route, IP trace, IP address locations] 測試從VisualRoute到目標網站的連線能力 (含地圖)

==== 檢查網站是否被中國的防火長城(GFW, Great Firewall of China)封鎖 ====
* {{Gd}} [http://www.websitepulse.com/ WebSitePulse] -> [http://www.websitepulse.com/help/testtools.china-test.html Website Test behind the Great Firewall of China]。從北美、南美、歐洲、亞洲、非洲等處連線測試<ref>[http://www.websitepulse.com/corporate/monitoring.network.php WebSitePulse Monitoring Network]  {{access | date = 2015-07-10}}</ref>。
** 教學: [http://sofree.tw/websitepulse/ WebSitePulse 檢查網站是否被大陸封鎖？ - 免費的喘息]
* [http://www.webkaka.com/ 卡卡網—在線網速測試|網速檢測|網站速度檢測|網站速度測試平台　www.webkaka.com]: 特色是除了國外的點，還從中國境內多處連線測試 {{access | date = 2015-07-10}}
* [http://www.greatfirewallofchina.org/ Great Firewall of China] 從中國內5處連線測試 {{access | date = 2015-07-10}}
* [https://zh.greatfire.org/ 中国的网络审查 | GreatFire.org] {{access | date = 2015-04-08}} {{exclaim}} 如果連線逾時，網頁會很久沒有回應。 {{access | date = 2015-07-10}}
* [http://www.jiankongbao.com/ 监控宝] [http://www.jiankongbao.com/labs/http HTTP工具] 從中國、歐美[http://www.jiankongbao.com/monitor 等處]連線測試 {{exclaim}} 如果連線逾時，網頁會很久沒有回應。 {{access | date = 2015-07-10}}
* [http://ping.chinaz.com/ chinaz] 135 個檢測點 {{access | date = 2017-08-10}}
* [https://dnschecker.org/ DNS Checker - DNS Check Propagation Tool] {{access | date = 2019-02-02}}
* {{exclaim}} 使用時網站沒有反應 [http://www.just-ping.com/ just ping]: Free online ping from 50 locations worldwide(includes China) {{access | date = 2015-07-10}}

相關文章
* [http://www.labnol.org/internet/blogging/test-website-blocked-in-china-or-accessible/3262/ How to Check If Your Website Is Blocked In China or Not]

{{Tips}} 了解什麼是[http://zh.wikipedia.org/wiki/%E9%87%91%E7%9B%BE%E5%B7%A5%E7%A8%8B 中國的防火長城(GFW, Great Firewall of China)]？

==== 使用國外 VPN 服務測試網路連線 ====
* {{Gd}} [http://hotspotshield.com/ Hotspot Shield] 美國
* brower testing tool by VM which located at US: [[User_agent#testing_desktop_browsers_and_mobile_browsers]]

==== 其他 ====
* [http://www.cloudping.info/ CloudPing.info] "... estimate the latency from your browser to each Amazon Web Services region." Cited from official website.

=== 分析網頁連線下載速度 ===
分析網頁連線下載速度，並提供網站開發者建議的服務或軟體
[[Optimize webpage speed]]

=== Monitor HTTP request ===
追蹤瀏覽器提出的網站網址要求(ex: URL of AJAX JSON)
* [http://www.fiddler2.com/fiddler2/ Fiddler Web Debugger - A free web debugging tool] for {{Win}}
* [http://getfirebug.com/logging Firebug] for {{Fx}}
* [http://www.httpwatch.com/ HttpWatch 8.5: Seamless HTTP monitoring for IE and Firefox] for {{IE}} & {{Fx}}
* {{Chrome}} 工具 -> 開發人員工具 -> Network

=== 觀察HTTP response status code(HTTP回應狀態代碼) ===
瀏覽網頁時，可以觀察該網頁或網頁內元件(例如嵌入圖檔或聲音)的HTTP response status code(HTTP回應狀態代碼)<ref>[http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html HTTP/1.1: Status Code Definitions]</ref>，例如404代表沒有該檔案。
* Mozilla Firefox {{Fx}}內建的工具 -> 網頁開發者 -> 網頁主控台。快速鍵: {{kbd | key = Ctrl}}+{{kbd | key = Shift}}+{{kbd | key = k}}。
** filter: available
** example as follows:
<pre>
[23:14:47.836] GET https://www.google.com/ [HTTP/1.1 200 OK 10763ms]
[23:14:59.707] GET https://www.google.com/ig/cp/get?hl=zh-TW&gl=&authuser=0&bundleJs=0 [HTTP/1.1 304 Not Modified 1593ms]
</pre>
* Firebug for {{Fx}}: 切換到「網路」標籤。快速鍵: {{kbd | key = F12}}
* Google {{chrome}}內建的工具 -> 開發人員工具 -> 切換到「network」標籤。快速鍵: {{kbd | key = Ctrl}}+{{kbd | key = Shift}}+{{kbd | key = i}}
* [https://addons.mozilla.org/en-US/firefox/addon/live-http-headers/ Live HTTP Headers] for {{Fx}}
* [https://curl.haxx.se/docs/manpage.html curl] on {{Linux}} or {{Mac}} e.g. {{kbd | key = <nowiki>curl -v -o /dev/null https://www.slideshare.net</nowiki>}} <ref>[https://asciinema.org/a/89998 中華電信有線網路無法連到 slideshare 的測試 - asciinema]</ref>

=== DNS 檢查 ===
websites
* {{Gd}} [http://www.whatsmydns.net/ What's My DNS? Global DNS Propagation Checker] {{access | date = 2020-03-24}} 介紹: [http://www.freegroup.org/2011/05/whats-my-dns/ What’s My DNS? 從世界各地的伺服器，檢查網址 DNS 更新情形]
* {{Gd}} [https://dnschecker.org/ DNS Checker - DNS Check Propagation Tool] 從世界各地的伺服器，檢查網址 DNS 解析 {{access | date = 2020-03-24}}
* [https://www.nslookuptool.com/ Global DNS Propagation Checker - Nslookup Tool] 從世界各地的伺服器，檢查網址 DNS 解析，並顯示對應 IP
* [http://www.intodns.com/ IntoDNS] "IntoDNS checks the health and configuration and provides DNS report and mail servers report." Quoted from official website. {{access | date = 2011-02-21}} {{exclaim}}不能檢查 subdomain
* [http://www.dnscolos.com/free-dns-report.html Free DNS Report] {{access | date = 2017-04-10}}
* SMTP [http://mxtoolbox.com/ MX Lookup Tool - Check your DNS MX Records online - MxToolbox] {{access | date = 2017-04-10}}
* [http://www.dnsinspect.com/ DNS Inspect - Free DNS checking tool with IPv6 support] "checks your domain's servers for common DNS and mail errors and generates a report with explanations how to fix them."
* [https://dnsflagday.net/ 2019 | DNS flag day] {{access | date = 2019-02-02}}
* [https://dnscheck.norid.no/ Domain tester] {{access | date = 2019-05-06}}
: other web ping: [http://www.fifi.org/services/ping fifi](ping, tracert... tools.), [http://www.maxmind.com/app/lookup lookup]

tools
* [http://en.wikipedia.org/wiki/Nslookup nslookup] for {{Win}} & {{Linux}} syntax: {{kbd | key = nslookup ''domain.com''}}
* [http://osxdaily.com/2015/06/02/change-dns-command-line-mac-os-x/ How to Change DNS from Command Line of Mac OS X] on {{Mac}}
* [https://superuser.com/questions/367969/how-can-i-direct-a-query-to-specific-dns-server command line - How can I direct a query to specific DNS server? - Super User] on {{Win}}
* [https://www.computerhope.com/unix/unslooku.htm Linux nslookup command help and examples] on {{Linux}}

=== 反查IP或網域 ===
* [http://nayuki.homeunix.com/~stakasa/cgi-bin/proxy.cgi GeekTools - Geek SupaSupa Version]
* [http://www.spamhaus.org/ The Spamhaus Project]
* [http://www.senderbase.org/ SenderBase]

=== Domain Categorization ===
* Cloudflare's categorization e.g. [https://radar.cloudflare.com/domains/feedback/apple.com Cloudflare Radar] of apple.com

=== 偵測使用的 CDN ===
偵測使用的 CDN ([https://zh.wikipedia.org/zh-tw/%E5%85%A7%E5%AE%B9%E5%82%B3%E9%81%9E%E7%B6%B2%E8%B7%AF 內容傳遞網路], Content Delivery Network或Content Distribution Network)
* {{Gd}} [https://www.whatsmycdn.com/ What's My CDN?] 偵測 CDN 不能選 Global，可以選 By Region: Asia
* [https://www.ultratools.com/tools/ipWhoisLookupResult WHOIS IP Lookup Tool | UltraTools]
* [https://tools.keycdn.com/geo IP Location Finder - IP Lookup With Detailed Geolocation Data | KeyCDN Tools]

references
* [https://geekflare.com/find-cdn-used-on-site/ How to find Which CDN is Used in a Website?]

== 無法網路連線 ==
To distinguish which section met trouble
# ping local IP
# ping Gateway
# check DNS...
# ping the remote IP of external website<ref>[https://www.wkb.idv.tw/moodle/mod/page/view.php?id=10467&lang=zh_tw IPv6_2017: IPv6連線互測-ping]</ref> (有些機器會關閉ICMP ECHO，讓我們無法Ping到它)
#* {{Win}} keyin {{kbd | key=<nowiki>ping <IPv4></nowiki>}} e.g. {{kbd | key=<nowiki>ping 8.8.8.8</nowiki>}} (8.8.8.8 is the IP of [https://developers.google.com/speed/public-dns/docs/using?hl=zh-tw Google Public DNS])
#* {{Win}} keyin {{kbd | key=<nowiki>ping -6 <IPv6></nowiki>}} e.g. {{kbd | key=<nowiki>ping -6 2001:4860:4860::8888</nowiki>}}

== 無法連線到網路的測試步驟 ==
* 檢查網站服務 for {{linux}}
** {{kbd | key=/etc/init.d/httpd status}}
** {{kbd | key=/etc/init.d/mysqld status}}
* 檢查本機端網站網頁是否能讀取
** {{kbd | key=lynx 127.0.0.1}}
* 檢查網站伺服器log 
* 從瀏覽器直接瀏覽網站網址
** 透過命令列模擬瀏覽器瀏覽網站 e.g. {{kbd | key=<nowiki>curl -v -o /dev/null https://www.slideshare.net</nowiki>}}

== 網路連線發生不穩 ==
如何看出哪一段線路慢了？
* Windows: 開始 -> 執行 -> 輸入cmd (進入"命令提示字元")
* (會顯示C:\某資料夾>)
: 請在閃爍游標處輸入 tracert web.domain.com (web.domain.com 改成想檢查的網站網址)
: 就可以看出是哪一段慢了，大家先作這個動作會有助於解決問題及增加回覆的速度喔
或者
: 請在閃爍游標處輸入 tracert web.domain.com > c:\result.txt
* 當出現第二次C:\某資料夾> (如果網路連線不穩定, 會花費相當多時間)
: 代表已經將連線過程紀錄成功在 c:\result.txt
* 請將這個文字檔寄給合適的網路管理員


參考資料
* [http://support.microsoft.com/kb/314868/zh-tw 如何使用 TRACERT 疑難排解 Windows 中的 TCP/IP 問題](使用ICMP協定, 可能因為對方伺服器關閉ICMP回應, 而影響測試結果)

== 類似工具 ==
=== GeoIP服務 ===
* {{Gd}} [http://www.geoiptool.com/en/ Geo IP Tool] (含地圖)
* [http://www.ip-adress.com/ My IP Address Lookup / IP Locator / Trace IP / What is my ip] (含地圖)
* [http://ip-lookup.net/ IP Address Lookup (IPv4 & IPv6)]

=== Blog ===
* [http://ismyblogworking.com/ Is My Blog Working?] "Enter your blog address above to check your server status, RSS feed, markup, security, and performance." ([http://www.flickr.com/photos/planetoid/5066993803/ 圖例])
** 介紹: [http://iwanthotnews.blogspot.com/2010/10/is-my-blog-working.html Is My Blog Working? 測試網站是否可正常運作-哈燒部落 I Want Hot News]


=== 伺服器主機資訊或採用的技術 ===
伺服器主機資訊或採用的技術，例如網站伺服器、 Javascript 框架、網頁框架、網頁字型 (web fonts)、程式語言等

* {{Gd}} [http://builtwith.com/ BuiltWith Technology Lookup]
** 使用方式: (1) [https://chrome.google.com/webstore/detail/builtwith-technology-prof/dapjbgnjinbpoindlpdmhochffioedbn?hl=zh-TW 瀏覽器擴充套件]、(2)線上輸入網址查詢、或 (3) 直接使用 bookmarklet <pre>javascript:location = 'https://builtwith.com/'+location.href.replace(/https?:\/\//i, "");</pre>
** 介紹:
** 查詢結果: e.g. [http://builtwith.com/techcrunch.com techcrunch.com Technology Profile of techcrunch.com] {{access | date= 2017-05-28}}


* [https://www.wappalyzer.com/ Wappalyzer - Identify technologies on websites] "Wappalyzer uncovers the technologies used on websites." Quoted from website.
** 使用方式: (1) 安裝[https://chrome.google.com/webstore/detail/wappalyzer-technology-pro/gppongmhjkpfnbhagpmjfkannfbllamg?hl=zh-TW 瀏覽器擴充套件]、或 (2) 直接使用 bookmarklet。
** 介紹: [https://www.minwt.com/pc/17655.html 「Wappalyzer」網站照妖鏡！一鍵顯示網站所用的主機、平台、語言與框架|梅問題．教學網]
** 查詢結果: 如下圖
: https://farm1.staticflickr.com/455/20398159845_e4d74885dd_n.jpg
: (image hosted by [https://flic.kr/p/x5vUg8 flickr])

* [https://searchdns.netcraft.com/ Netcraft - Search Web by Domain] 可查詢伺服器主機的{{Acronym | acronym= OS | def= 作業系統(Operating system)}}、IP及上線時間(uptime)、採用的技術等資訊。 
** 使用方式: (1) 線上輸入網址查詢、或 (2) 直接使用 bookmarklet <pre>javascript:location%20=%20'http://toolbar.netcraft.com/site_report?url='+escape(location);%20void%200</pre>
** 介紹:
** 查詢結果: e.g. [http://toolbar.netcraft.com/site_report?url=techcrunch.com Site report for techcrunch.com]

=== 伺服器主機上線時間(uptime) ===
* [http://news.netcraft.com/ Netcraft]可查詢伺服器主機的{{Acronym | acronym= OS | def= 作業系統(Operating system)}}、IP及上線時間(uptime)、採用的技術等資訊。  {{access | date= 2017-05-31}}
* [http://www.uptimedoctor.com/en/ranking.php Webhost Ranking - Uptime Doctor] e.g. [http://www.uptimedoctor.com/en/ranking.php?type=2 Virtual Private Hosting | Webhost Ranking - Uptime Doctor] {{access | date= 2017-05-31}}

=== 伺服器啟用 HTTP 壓縮 (HTTP Compression) ===
檢查伺服器是否啟用 [https://zh.wikipedia.org/zh-tw/HTTP%E5%8E%8B%E7%BC%A9 HTTP 壓縮] 的服務
* [http://www.whatsmyip.org/http-compression-test/ WhatsMyIP.org | HTTP Compression Test] 允許輸入 IP 網址 {{access | date=2017-03-20}} 
* [http://checkgzipcompression.com/ Check GZIP compression] ex: [http://checkgzipcompression.com/?url=http%3A%2F%2Fgoogle.com google.com is gzip compressed] {{exclaim}} 不允許輸入 IP 網址，會遇到「error 15 - website address contains an invalid domain extension」錯誤訊息。 {{access | date=2017-03-20}} 

Benchmark
* [http://httparchive.org/index.php HTTP Archive] 從 Alexa 取得前 100萬名的網站網址清單，分析其網頁載入時間、使用的JS、圖片、字型所需載入檔案大小。{{access | date=2016-04-24}}

=== 伺服器啟用 HTTP/2 ===
檢查伺服器是否啟用 HTTP/2
* [https://tools.keycdn.com/http2-test HTTP/2 Test - Verify HTTP/2 Support | KeyCDN Tools]

=== SSL Server Test ===
{{:SSL Server Test}}

=== 追蹤網站內容更新或變化 ===
[[Monitor webpage content update | 追蹤網站內容更新的線上服務]]

== References ==
<references />

further reading
* [https://en.wikipedia.org/wiki/HTTP_451 HTTP 451 - Wikipedia, the free encyclopedia] {{access | date = 2016-06-28}} HTTP 451 Unavailable For Legal Reasons / 因法律原因無法訪問


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