Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations strongm on being selected by the Tek-Tips community for having the most helpful posts in the forums last week. Way to Go!

detecting 404 errors

Status
Not open for further replies.
ozpeppers

ozpeppers

Programmer
Jul 17, 2001
32
BN
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
 
Sort by date Sort by votes
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]
 
Upvote 0 Downvote
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>
 
Upvote 0 Downvote
Status
Not open for further replies.

Similar threads

Halliarse
  • Locked
  • Question
Excessive 404 errors
Replies
1
Views
142
ChrisHirst
ChrisHirst
Asher01
  • Locked
  • Question
Vbscript detecting and adding logged on user to local admin
Replies
1
Views
77
ChrisHirst
ChrisHirst
stinkybee
  • Locked
  • Question
CDOSYS email, detecting bounced email
Replies
3
Views
97
ChrisHirst
ChrisHirst
Clint0890
  • Locked
  • Question
Compile errors in web reference - reference.vb
Replies
1
Views
47
Clint0890
Clint0890
Glasgow
  • Locked
  • Question
How to retrieve 'bad' portion of URL in 404 trap 1
Replies
11
Views
101
guitarzan
guitarzan

Part and Inventory Search

Sponsor

Back
Top