Test connectivity for the web service: Difference between revisions

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Test connectivity for the web service (edit)

Revision as of 10:34, 25 March 2022

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find the problem occurred: (1) local service at the server (localhost) (2) from LAN to server (3) from WAN to server
find the problem occurred: (1) local service at the server (localhost) (2) from LAN to server (3) from WAN to server
=== How to connect to local web service ===
After logged into the server
If the service is the web server:
* (1) Open the browser, (2) Type the address: {{kbd | key = <nowiki>http://127.0.0.1</nowiki> }}
* Linux command:
*# (optional if lynx was not installed) {{kbd | key = <nowiki>yum install lynx</nowiki>}} for CentOS / {{kbd | key = <nowiki>sudo apt-get install lynx</nowiki>}} for Ubuntu<ref>[http://www.addictivetips.com/ubuntu-linux-tips/install-and-use-lynx-on-ubuntu/ Install and Use Lynx Browser on Ubuntu]</ref>
*# {{kbd | key = <nowiki>lynx http://127.0.0.1</nowiki>}} <ref>[http://lynx.isc.org/lynx2.8.7/lynx2-8-7/lynx_help/Lynx_users_guide.html Lynx Users Guide v2.8.7]</ref> for {{Linux}}
If the service is not the web server, use telnet instead
# {{kbd | key = telnet 127.0.0.1 <PORT>}} e.g. {{kbd | key = telnet 127.0.0.1 80}}
# (after telnet-ed the web 80 port, key in) {{kbd_plus | key1 = get | key2 = SPACE}}
# more on [http://www.simplescripts.de/http-check-port-80-telnet-command.htm HTTP Check Port 80 with the Telnet Command]
=== How to connect to remote web service ===
Open the browser from outside network ex: Wide Area Network (WAN) or Local Area Network (LAN)
* and type the address: {{kbd | key =<nowiki>http://the.domain</nowiki>}} {{exclaim}} Note: Not [https://en.wikipedia.org/wiki/Private_network Private network] / Private IP address
* or use the remote website monitoring services: [[Web Ping]]
Using alternative web services if the Python was installed
* (for python 2.x) {{kbd | key=<nowiki>python -m SimpleHTTPServer <port></nowiki>}}<ref>[https://docs.python.org/2/library/simplehttpserver.html 20.19. SimpleHTTPServer — Simple HTTP request handler — Python 2.7.17 documentation]</ref>
* (for python 3.x) {{kbd | key=<nowiki>python -m http.server <port></nowiki>}}<ref>[https://docs.python.org/3.8/library/http.server.html?highlight=http%20server#module-http.server http.server — HTTP servers — Python 3.8.1 documentation]</ref>
Using telnet client
* (optional) [https://docs.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2008-R2-and-2008/cc771275(v=ws.10) Install Telnet Client | Microsoft Docs] on {{Win}}. [https://medium.com/@blackSource/bring-telnet-back-on-macos-high-sierra-11de98de1544 Bring telnet back on macOS high Sierra – Ayuth Mangmesap (blackSource) – Medium] on {{Mac}}
* telnet ''DOMAIN_or_IP'' ''PORT'' ex: {{kbd | key = telnet the.domain 80}}
** If connected. The console windows will show the message "Escape character is '^]'. " for {{Linux}}. Or show a blank window for {{Win}} If you want to end the telnet command. You can (1) press {{Kbd plus | key1 = Ctrl | key2 = ]}} and (2) keyin {{Kbd | key = quit}} to end the telnet.
** If failed. It will show the message: "telnet: Unable to connect to remote host: Connection refused"
curl
* {{kbd | key = <nowiki>curl -v -o /dev/null http://IP:Port</nowiki>}} If failed. It will show the message: "failed: Connection refused"




Line 63: Line 95:
<span style="color:red">WAN &#9679; -------&gt; &#9679; LAN -------&gt; &#9679; server</span>
<span style="color:red">WAN &#9679; -------&gt; &#9679; LAN -------&gt; &#9679; server</span>


=== How to connect to remote web service ===
Open the browser from outside network ex: Wide Area Network (WAN) or Local Area Network (LAN)
* and type the address: {{kbd | key =<nowiki>http://the.domain</nowiki>}} {{exclaim}} Note: Not [https://en.wikipedia.org/wiki/Private_network Private network] / Private IP address
* or use the remote website monitoring services: [[Web Ping]]
Using alternative web services if the Python was installed
* (for python 2.x) {{kbd | key=<nowiki>python -m SimpleHTTPServer <port></nowiki>}}<ref>[https://docs.python.org/2/library/simplehttpserver.html 20.19. SimpleHTTPServer — Simple HTTP request handler — Python 2.7.17 documentation]</ref>
* (for python 3.x) {{kbd | key=<nowiki>python -m http.server <port></nowiki>}}<ref>[https://docs.python.org/3.8/library/http.server.html?highlight=http%20server#module-http.server http.server — HTTP servers — Python 3.8.1 documentation]</ref>
Using telnet client
* (optional) [https://docs.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2008-R2-and-2008/cc771275(v=ws.10) Install Telnet Client | Microsoft Docs] on {{Win}}. [https://medium.com/@blackSource/bring-telnet-back-on-macos-high-sierra-11de98de1544 Bring telnet back on macOS high Sierra – Ayuth Mangmesap (blackSource) – Medium] on {{Mac}}
* telnet ''DOMAIN_or_IP'' ''PORT'' ex: {{kbd | key = telnet the.domain 80}}
** If connected. The console windows will show the message "Escape character is '^]'. " for {{Linux}}. Or show a blank window for {{Win}} If you want to end the telnet command. You can (1) press {{Kbd plus | key1 = Ctrl | key2 = ]}} and (2) keyin {{Kbd | key = quit}} to end the telnet.
** If failed. It will show the message: "telnet: Unable to connect to remote host: Connection refused"
curl
* {{kbd | key = <nowiki>curl -v -o /dev/null http://IP:Port</nowiki>}} If failed. It will show the message: "failed: Connection refused"
=== other issues ===
We met the trouble on WAN (wide area network). If we do no have the administrative permission, the tests we can do as follows:
We met the trouble on WAN (wide area network). If we do no have the administrative permission, the tests we can do as follows:
*  [http://downforeveryoneorjustme.com/ Down for everyone or just me?] more on [[Web_Ping#同時從世界各處測試網站連線 | Web Ping]]
*  [http://downforeveryoneorjustme.com/ Down for everyone or just me?] more on [[Web_Ping#同時從世界各處測試網站連線 | Web Ping]]
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