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detecting 404 errors

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ozpeppers

ozpeppers

Programmer
Jul 17, 2001
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Hello,

I'm building a web portal that users can submit their sites to.

These sites are linked to.. at moment using repsonse.redirect(address)

Does anyone know of a way to detect a 404 or similar error and redirect the page back to the portal, so site can be flagged as having an error.

Thanks in advance

Mark
 
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Are you using IIS? If so you can look at the properties of your web site & go to the Custom Errors tab. Haven't tried it, but this may do what you want.

Jessica [ponytails2]
 
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I assume you don't control the sites you are redirecting to?

How about using the M$ XMLHTTP object?

Here's a simple little example of it in action (sorry but it's in my preferred ASP language, Javascript).

<%@language=&quot;javascript&quot; enablesessionstate=&quot;false&quot;%>
<%
var url = new String(Request.QueryString(&quot;URL&quot;));
var startmarker = new String(Request.QueryString(&quot;start&quot;));
var stopmarker= new String(Request.QueryString(&quot;stop&quot;));
var avoiddomain= new String(Request.QueryString(&quot;avoiddomain&quot;));
var trimstop= new String(Request.QueryString(&quot;trimstop&quot;));
if (isNaN(trimstop)) trimstop = 0;
if (url != &quot;undefined&quot;){
url = &quot; + url.replace(&quot; &quot;&quot;)
var http = Server.CreateObject(&quot;Microsoft.XMLHTTP&quot;);
http.open(&quot;GET&quot;, url, false);
http.setRequestHeader(&quot;Content-type:&quot;, &quot;text/html&quot;);
try{
http.send();
if (http.statusText == &quot;OK&quot;){
var output = new String(http.responseText);
if (output != &quot;undefined&quot; && startmarker != &quot;undefined&quot;)
output = output.substring(output.indexOf(startmarker), output.length);
if (output != &quot;undefined&quot; && stopmarker != &quot;undefined&quot;)
output = output.substring(0, output.indexOf(stopmarker) + stopmarker.length * (1 - trimstop));
output = output.replace(/http:\/\//gi, &quot; if (output != &quot;undefined&quot; && avoiddomain != &quot;undefined&quot;)
var avoiddomainre = new RegExp(&quot;href=\&quot;.*&quot; + avoiddomain + &quot;.*\&quot;&quot;, &quot;gi&quot;);
output = output.replace(avoiddomainre, &quot;name=\&quot;\&quot;&quot;);
if (output != &quot;undefined&quot;) Response.write(output);
}
}catch(e){
%><html>
<body>
<% Response.write(e);
%> </body>
</html>
<% }
http = null;
}
%>

This doesn't quite do what you want, but with minor modifications it could (note in particular the statusText property above).



codestorm
Fire bad. Tree pretty. - Buffy
Kludges are like lies.
You're not a complete programmer unless you know how to guess.
I hope I never consider myself an 'expert'.
<insert witticism here>
 
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