Recently I discovered a problem with Manifold WMS where if the page wasn’t accessed for a while it would cause the w3wp.exe IIS worker thread to loop. Until I find out the underlying cause I’ve written the map_keepalive.wsf script below to automatically retrieve a web page and scheduled it to run every 5 minutes. I assume something gets spun down and the concurrent WMS requests cause a problem, the map_test.asp page that this script retrieves is just a default IMS page generated from within Manifold.<\/p>\n
\n<package>\n <job id="js">\n <script language="JScript">\n\tvar finished = false;\n\tvar timeout = 0;\n\tvar timeoutSecs = 30;\n\tvar forAppending = 8;\n\tvar xmlhttp = WScript.CreateObject("MSXML2.XMLHTTP");\n\txmlhttp.open("GET", "http:\/\/www.satsleuth.com", false);\n\txmlhttp.onreadystatechange = function() {\n\t\tif(xmlhttp.readyState == 4)\n\t\t\tfinished = true;\n\t}\n\ttry {\n\t\txmlhttp.Send("");\n\t} catch (e) {\n\t}\n\twhile ((!finished) && (timeout < timeoutSecs))\n\t{\n\t\ttimeout++;\n\t\tWScript.Sleep(1000);\n\t}\n\tvar msg = ""\n\tif (!finished)\n\t\tmsg = "Timeout occurred";\n\telse if (xmlhttp.status != 200)\n\t\tmsg = "Error retrieving map_test.asp, error code: " + xmlhttp.status;\n\tif (msg != "") {\n\t\tvar oFSO = WScript.CreateObject("Scripting.FileSystemObject");\n\t\tvar oFile = oFSO.OpenTextFile("map_keepalive.log", forAppending, true);\n\t\tvar dt = new Date();\n\t\toFile.WriteLine(dt.toLocaleString() + ": " + msg);\n\t\toFile.Close();\n\t}\n <\/script>\n <\/job>\n<\/package>\n<\/pre>\n","protected":false},"excerpt":{"rendered":"Recently I discovered a problem with Manifold WMS where if the page wasn’t accessed for a while it would cause the w3wp.exe IIS worker thread to loop. Until I find out the underlying cause I’ve written the map_keepalive.wsf script below to automatically retrieve a web page and scheduled it to run every 5 minutes. I […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3,8],"tags":[],"class_list":["post-253","post","type-post","status-publish","format-standard","hentry","category-gps","category-programming"],"yoast_head":"\r\n
JScript to automatically retrieve \/ check web page - Peter Johnson's Blog<\/title>\r\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\r\n<link rel=\"canonical\" href=\"https:\/\/blog.peter-johnson.com.au\/index.php\/2010\/01\/12\/jscript-to-automatically-retrieve-check-web-page\/\" \/>\r\n<meta property=\"og:locale\" content=\"en_US\" \/>\r\n<meta property=\"og:type\" content=\"article\" \/>\r\n<meta property=\"og:title\" content=\"JScript to automatically retrieve \/ check web page - Peter Johnson's Blog\" \/>\r\n<meta property=\"og:description\" content=\"Recently I discovered a problem with Manifold WMS where if the page wasn’t accessed for a while it would cause the w3wp.exe IIS worker thread to loop. Until I find out the underlying cause I’ve written the map_keepalive.wsf script below to automatically retrieve a web page and scheduled it to run every 5 minutes. 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