Is it possible to ping a server from Javascript

Question

I m making a web app that requires that I check to see if remote servers are online or not  When I run it from the command line  my page load goes up to a full 60s  for 8 entries  it will scale linearly with more    I decided to go the route of pinging on the user s end  This way  I can load the page and just have them wait for the  server is online  data while browsing my content   If anyone has the answer to the above question  or if they know a solution to keep my page loads fast  I d definitely appreciate it

User · Answer

let webSite    https   google com    https get webSite  function  res           If you get here  you have a response         If you want  you can check the status code here to verify that it s  200  or some other  2xx       console log webSite         res statusCode     on  error   function e           Here  an error occurred   Check  e  for the error      console log e code         if you run this with node it would console log 200 as long as google is not down

User · Answer

It might be a lot easier than all that   If you want your page to load then check on the availability or content of some foreign page to trigger other web page activity  you could do it using only javascript and php like this     yourpage php   lt  php if  isset   GET  urlget        if    GET  urlget              foreignpage  file get contents  http   www foreignpage html           you could also use curl for more fancy internet queries or if http wrappers aren t active in your php ini        parse  foreignpage for data that indicates your page should proceed     echo  foreignpage     or a portion of it as you parsed     exit        this is very important  otherwise you ll get the contents of your own page returned back to you on each call         gt    lt html gt    mypage html content         lt script gt  var stopmelater  setInterval  getforeignurl   urlget doesntmatter     2000    function getforeignurl url     var handle  browserspec      handle open  GET   url  false     handle send      var returnedPageContents  handle responseText       parse page contents for what your looking and trigger javascript events accordingly       use handle open  GET   url  true  to allow javascript to continue executing  must provide a callback function to accept the page contents with handle onreadystatechange     function browserspec      if  window XMLHttpRequest       return new XMLHttpRequest       else      return new ActiveXObject  Microsoft XMLHTTP            lt  script gt    That should do it   The triggered javascript should include clearInterval stopmelater   Let me know if that works for you  Jerry

User · Answer

const ping    url  timeout   6000    gt      return new Promise  reslove  reject    gt        const urlRule   new RegExp   https  ftp file     -A-Za-z0-9  amp                  -A-Za-z0-9  amp                  if   urlRule test url   reject  invalid url        try         fetch url           then      gt  reslove true            catch      gt  reslove false          setTimeout      gt            reslove false            timeout         catch  e          reject e                    use like this   ping  https   stackoverflow com       then res  gt console log res      catch e  gt console log e

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The problem with standard pings is they re ICMP  which a lot of places don t let through for security and traffic reasons  That might explain the failure    Ruby prior to 1 9 had a TCP-based ping rb  which will run with Ruby 1 9   All you have to do is copy it from the 1 8 7 installation to somewhere else  I just confirmed that it would run by pinging my home router

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Pitching in with a websocket solution     function ping ip  isUp  isDown      var ws   new WebSocket  ws       ip     ws onerror   function e       isUp        ws   null         setTimeout function          if ws    null          ws close          ws   null        isDown              2000

User · Answer

You can t directly  ping  in javascript  There may be a few other ways    Ajax Using a java applet with isReachable  Writing a serverside script which pings and using AJAX to communicate to your serversidescript You might also be able to ping in flash  actionscript

User · Answer

You could try using PHP in your web page   something like this    lt html gt  lt body gt   lt form method  post  name  pingform  action   lt  php echo   SERVER  PHP SELF      gt   gt   lt h1 gt Host to ping  lt  h1 gt   lt input type  text  name  tgt host  value   lt  php echo   POST  tgt host      gt   gt  lt br gt   lt input type  submit  name  submit  value  Submit   gt   lt  form gt  lt  body gt   lt  html gt   lt  php   tgt host     POST  tgt host     output   shell exec  ping -c 10     tgt host      echo   lt html gt  lt body style   background-color  0080c0   gt   lt script type   text javascript   language   javascript   gt alert   Ping Results       output          lt  script gt   lt  body gt  lt  html gt       gt    This is not tested so it may have typos etc   but I am confident it would work  Could be improved too

User · Answer

I have found someone that accomplishes this with a very clever usage of the native Image object    From their source  this is the main function  it has dependences on other parts of the source but you get the idea    function Pinger ping ip  callback       if  this inUse         this inUse   true      this callback   callback     this ip   ip       var  that   this       this img   new Image         this img onload   function     that good          this img onerror   function     that good           this start   new Date   getTime        this img src    http       ip      this timer   setTimeout function      that bad      1500            This works on all types of servers that I ve tested  web servers  ftp servers  and game servers   It also works with ports  If anyone encounters a use case that fails  please post in the comments and I will update my answer   Update  Previous link has been removed  If anyone finds or implements the above  please comment and I ll add it into the answer   Update 2   trante was nice enough to provide a jsFiddle    http   jsfiddle net GSSCD 203   Update 3   Jonathon created a GitHub repo with the implementation   https   github com jdfreder pingjs  Update 4  It looks as if this implementation is no longer reliable  People are also reporting that Chrome no longer supports it all  throwing a net  ERR NAME NOT RESOLVED error  If someone can verify an alternate solution I will put that as the accepted answer

User · Answer

There are many crazy answers here and especially about CORS -  You could do an http HEAD request  like GET but without payload   See https   ochronus com http-head-request-good-uses   It does NOT need a preflight check  the confusion is because of an old version of the specification  see Why does a cross-origin HEAD request need a preflight check   So you could use the answer above which is using the jQuery library  didn t say it  but with   type   HEAD    ---    lt script gt      function ping             ajax             url   ping html             type   HEAD             success  function result                alert  reply                                error  function result                 alert  timeout error                                  lt  script gt    Off course you can also use vanilla js or dojo or whatever

User · Answer

To keep your requests fast  cache the server side results of the ping and update the ping file or database every couple of minutes or however accurate you want it to be   You can use cron to run a shell command with your 8 pings and write the output into a file  the webserver will include this file into your view

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Ping is ICMP  but if there is any open TCP port on the remote server it could be achieved like this     function ping host  port  pong       var started   new Date   getTime       var http   new XMLHttpRequest       http open  GET    http       host         port    async  true     http onreadystatechange   function         if  http readyState    4          var ended   new Date   getTime           var milliseconds   ended - started         if  pong    null            pong milliseconds                        try       http send null       catch exception           this is expected

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You can run the DOS ping exe command from javaScript using the folowing   function ping ip        var input           var WshShell   new ActiveXObject  WScript Shell        var oExec   WshShell Exec  c  windows system32 ping exe     ip        while   oExec StdOut AtEndOfStream                    input    oExec StdOut ReadLine       lt br   gt              return input      Is this what was asked for  or am i missing something

User · Answer

I don t know what version of Ruby you re running  but have you tried implementing ping for ruby instead of javascript  http   raa ruby-lang org project net-ping

User · Answer

If what you are trying to see is whether the server  exists   you can use the following   function isValidURL url        var encodedURL   encodeURIComponent url       var isValid   false         ajax         url   http   query yahooapis com v1 public yql q select 20  20from 20html 20where 20url 3D 22    encodedURL     22 amp format json         type   get         async  false        dataType   json         success  function data            isValid   data query results    null                 error  function            isValid   false                       return isValid      This will return a true false indication whether the server exists   If you want response time  a slight modification will do   function ping url        var encodedURL   encodeURIComponent url       var startDate   new Date        var endDate   null        ajax         url   http   query yahooapis com v1 public yql q select 20  20from 20html 20where 20url 3D 22    encodedURL     22 amp format json         type   get         async  false        dataType   json         success  function data            if  data query results    null                endDate   new Date              else               endDate   null                           error  function            endDate   null                       if  endDate    null            throw  Not responsive                 return endDate getTime   - startDate getTime        The usage is then trivial   var isValid   isValidURL  http   example com    alert isValid    Valid URL        Damn         Or   var responseInMillis   ping  example com    alert responseInMillis

User · Answer

You can t do regular ping in browser Javascript  but you can find out if remote server is alive by for example loading an image from the remote server  If loading fails -  server down    You can even calculate the loading time by using onload-event  Here s an example how to use onload event

User · Answer

just replace  file get contents   with   ip     SERVER  xxx xxx xxx xxx    exec  ping -n 4  ip 2 gt  amp 1    output   retval   if   retval    0       echo  no        else     echo  yes

User · Answer

you can try this   put ping html on the server with or without any content  on the javascript do same as below    lt script gt      function ping             ajax             url   ping html             success  function result                alert  reply                                error  function result                 alert  timeout error                                  lt  script gt

[javascript] Is it possible to ping a server from Javascript?

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