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POUrlFetchApp.fetch(url) intermittent "Unexpected error"
 

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  1. POUrlFetchApp.fetch(url) intermittent "Unexpected error"
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    <p>In order to check HTTP service status I've wrote script that goes through spreadsheet and for a list of URLs checks if they are Up or Down, script is time driven every five minutes.</p> <p>I have rare intermittent "Unexpected error" errors from UrlFetchApp.fetch(url) and from time to time there are DNS and Timeout errors that will go away if I repeat request after few seconds.</p> <p>No few actual questions if someone can help: I've used Utilities.sleep(5000) to pause for 5 seconds, is that OK or there are better ways to wait and try to fetch again after few seconds?</p> <p>Why do I get "Unexpected error" even if I repeat request after 5 seconds, when script is run again after five minutes there is no "Unexpected error" !?</p> <p>How could I improve code below?</p> <p>Actual script:</p> <pre><code>/* Periodically check status of web sites :-) Google Apps for Busines UrlFetch daily limit is 100.000 requests, Algorithm read site and old status from sheet check site and set new status if status changed send email (+sms in future by using twilio) update status in spreadsheet "Site, Status code, Time of last change, Last error description" */ function main() { var sheet = SpreadsheetApp.getActiveSheet() ; var currentRow, oldStatusCode, newStatusCode ; var url, response, err, subject, message ; var today = new Date() ; currentRow = 2 while ((url = sheet.getRange(currentRow, 1).getValue()) != "") { oldStatusCode = sheet.getRange(currentRow, 2).getValue() ; newStatusCode = "Ok" subject = "mCheck: " + url + " Up Status Change!" ; message = url + " Up Status Change!" + "\n Time: " + today.toUTCString() ; var tries = 3 ; // Check at least three times that status changed and it is not a one time glitch do { try { response = UrlFetchApp.fetch(url) ; } catch (err) { newStatusCode = "Down" sheet.getRange(currentRow, 4).setValue(err.message) ; subject = "mCheck: " + url + " Down Status Change!" ; message = url + " Down Status Change!" + "\n Error message: " + err.message + "\n Time: " + today.toUTCString() ; if (err.message.indexOf("Unexpected") &gt; -1) { // If UrlFetch failed on Google side just ignore this iteration... newStatusCode = oldStatusCode ; } } if (oldStatusCode != newStatusCode) { // In case of status change wait 5 seconds before trying again Utilities.sleep(5000) ; } --tries ; } while ((oldStatusCode != newStatusCode) &amp;&amp; tries &gt;= 0) if (oldStatusCode != newStatusCode) { sheet.getRange(currentRow, 2).setValue(newStatusCode) ; sheet.getRange(currentRow, 3).setValue(today.toUTCString()) ; if (oldStatusCode != "") { MailApp.sendEmail(email_to, subject, message) ; } } ++currentRow; } </code></pre> <p>}</p>
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    1. PTQuestion
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    1. USM14d3n
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      1. POUrlFetchApp.fetch(url) intermittent "Unexpected error"
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      1. VTUpMod
    1. COI have written a Google Apps script for the same purpose and am being hit by the same issue. If you found a solution for this please post it here. I will keep looking elsewhere...
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      1. POUrlFetchApp.fetch(url) intermittent "Unexpected error"
      1. USRafael Chaves
    2. COIt seems other people are seeing this as well. https://code.google.com/p/google-apps-script-issues/issues/detail?id=2758 https://code.google.com/p/gmail-delay-send/issues/detail?id=60
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      1. POUrlFetchApp.fetch(url) intermittent "Unexpected error"
      1. USRafael Chaves
 

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